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Thursday, August 19, 2010

REFERENCE TABLE OF TRANSISTOR FOR HORIZONTAL / LINE SCAN FOR CRT MONITORS AND CRT TELEVISIONS



CRT TVs and most computer and video monitors depend on the use of similar (at least in concept) LINE DEFLECTION circuit configurations to generate several outputs:

 Current waveform required in the deflection yoke coils of the CRT for linear sweep of the electron beam to create a high quality (geometry and linearity) picture. This is close to a sawtooth but not quite.
 CRT High voltage (20 to 30 kV or more) required to accelerate the electron beam and provide high brightness and sharp focus, as well as other related voltages - focus and screen (G2).
 Various auxiliary power and signals for other subsystems of the equipment (low voltage, CRT filament, feedback, etc.).

  Every line transistor has its own requirements for:

  • Amount of base drive current, especially the Ib at end-of-scan.
  • Waveform of base drive current (rising, steady, falling)
  • Speed of reduction base drive current at switch-off.
The most effort goes into the optimization of the magnitude of the base drive current. The problem is: gain spread. In the ideal world, all transistors would come from the factory with exactly the same gain. In the real world, this isn't the case - it isn't even close. You have to find *one* optimum drive so that neither the high-gain nor the low-gain type will dissipate too much power taking into consideration the variations in other circuit components as well. There used to be other spread factors influencing the dynamic transistor parameters but fortunately, these have been mostly eliminated by better process control.
  • Overdriving causes a slow switch-off behavior, some collector current keeps flowing during the beginning of the flyback and will cause dissipation.
  • Underdriving causes bad saturation, the collector voltage will start to rise before the flyback should start. This too causes dissipation.
Either condition is easily observed with an oscilloscope, a current probe and a 1:100 voltage probe (be sure to calibrate it for high frequency response!). The dissipation as a function of the base drive current is a more-or-less parabolic function with a global minimum. The minimum will be different for high-gain and low-gain types. By measuring the curves for both extreme types and combining them, an optimum drive for the random type will be found, with a figure for the worst-case dissipation.

 All this will only be true if you insert a device which is a member of the population spread for which you optimized the base drive. If you just insert a random other device (different type, same type but different brand, same type and brand but much older/newer batch) then all bets are off. Dissipation may be way too high, with early failure as a result (and possibly a distorted picture geometry due to excess damping of the waveform).
It is certainly not possible to substitute a standard HOT (BU508) in place of a more advanced type (in >> 15 kHz applications like a monitor). It is also a very bad idea to substitute a BU508 in place of a much lighter type like a BUT11 (used in <= 17" sets). It will fail! 
With horizontal output transistors, it is *not* true that 'bigger is better'. If you substitute a heavier transistor (more amps, more volts, more watts, faster switching, whatever) for a lighter one, then there is a very big chance that it will fail earlier, not later. The reason is that the drive conditions will now be wrong (most likely underdrive) and the transistor will overheat from too high conduction losses (Ic * Vce,sat). So do yourselves a favour and get a correct replacement type. 

 If cost weren't an issue, transistors and other parts could be hand selected (and some are in any case). But, you wouldn't be able to buy a monitor for $$$  if that were required!

Is there a Universal HOT Replacement for TVs?

WARNING: As noted elsewhere in this document, the following approach is much less likely to work with long term (or even more than a few millisecond) reliability in high performance computer monitors. I shouldn't say this, but, for a number of years ago used a  universal Horizontal Output Transistor 2SC1308K or NTE238. This worked in almost every set out there that used a transistor and not SCR's (RCA, etc.). This may not be the best way of substituting, but, these 2 part numbers seem to have fairly high gain, power capability, voltage ratings, current ratings, etc. These characteristics made it a good substitute and when you buy 100 at a time you would get a really good price................

 This may not work in your case...............


 Is There a Universal HOT Replacement for Monitors?

 "Would anyone like to comment on BU508's, they should be to the same spec. and born equal. My experience has been that different manufacturers BU508's behave differently. One make will fry and last about 3 weeks, put in a different make, no circuit change, and it runs cool, and is still running 3 years later. Price doesn't seem to be a guide, a $1 one may run cool and have no mfr. code, while a branded one might cost a lot more and run hot."
Yes, here you have the problem exactly!

There is such a thing as component spread. Base drive must be optimized for the whole range of gain within a type. That range can be so large that at the limits of the spread the dissipation can still be too large. The reason is that the device with the largest gain will be overdriven, causing a tail in the current at switch-off, whereas the device with the smallest gain will be underdriven, causing it not too saturate enough. Each condition can be easily viewed on the 'scope. By varying the base drive you can minimize dissipation.............................

Normally one basedrive is set for the entire population, accepting the variation in dissipation and its upper limit. Sometimes the variation is so large that this will not be acceptable. But this is unlikely for a BU508 in a 16 kHz application. Substituting it with a similar type from a different brand with different parameter spread may indeed cause it to dissipate too much and thus fail early. This has nothing to do with price or quality, just with a different optimum base drive. If base drive has been optimized for a brand with low parameter spread then it can be that the heatsink may have correctly been selected smaller..........................................



Typical Types of HOTs Used in Monitors:

14", SVGA (38 kHz)         A-types: BU2508AF, 2SC4830,  2SC5148.

                           D-types: BU2508DF, 2SC4762,  2SC4916,  2SC5149,
                                    2SC4291,  2SC5250.

15", XVGA (64 kHz)         A-types: BU2520AF, BU2522AF, 2SC3885A, 2SC3886A,
                                    2SC4757,  2SC4758,  2SC5129,  2SC4438,
                                    2SC4770,  2SC4743,  2SC5067,  2SC5207,
                                    2SC5251,  2SC5002.

                           D-types: BU2520DF, 2SC3892A, 2SC3893A, 2SC4531,
                                    2SC4763,  2SC4124,  2SC4769,  2SC5296,
                                    2SC4742,  2SC4744,  2SC4927,  2SC5003.

 Note that transistors with built-in damper diodes also are likely to have a base to emitter resistor of about 50 ohms - keep this in mind when testing a HOT with a multimeter - that 50 ohm resistor will look like a shorted junction on the diode test scale.

In nearly all the above cases, the devices will plug-in substitute for each other within a category.

For designs with larger screen sizes (and higher frequencies) the device selection is not so straightforward as some designs which split the horizontal deflection and high voltage generation circuitry.

Continuous dissipation is hardly ever the cause of failure. Failure is usually due to some infrequent transient condition. For multi-frequency monitor designs of 1991-1994 mode-change was/is a big killer. When repairs are made it is wise to cycle through a mode-change sequence. Delays of about 1 min. between changes should be used, shorter delays can cook the device.

    As a rule, once an engineer has a bad experience with mode change he takes greater care in the small-signal circuitry of his next design. This has led to mode change, in general, becoming more benign in the last couple of years. However, in Taiwan & Korea there is a high turn round of engineering staff and some, shall we say, less than perfect designs do still reach production...................................

    To "cook" a device by mode changing would take at least 30 mins. of continuous changing with a delay of about 20 seconds between each change.................................

    If a device fails during such a sequence the old spit test is good indicator of why a device fails. That is, a drop of spit on the HOT immediately after failure can tell us a lot: if it sizzles, then the device has probably cooked, if it doesn't then the device failed instantly after one stressful cycle. Frontiers of technology it is isn't but it is a useful technique.

    If you do get failures which haven't been caused by...................... the HOT "cooking"............................................................................ no easy solution...................

 Varieties of BU508 HOTs..............

 BU508 series seem to come in a number of variants, I haven't sorted out the specification for each listed variant, but have found that it's worth trying replacements by different manufacturers. Also if the device is on a grounded piece of metal as heatsink try adding another radiator (twisted vane is my preference). Some TV manufacturers introduce post production mods to change resistance values to provide more drive into the base, this may be in the base or emitter. Scope the waveform for parasitic high frequency oscillation and check that the waveform looks clean. Check voltage rails, supply and derived, and that the set is not over scanning. Check all the components around the horizontal output stage, it may be the manufacturer. had a duff batch of some component (often a capacitor that goes OC) that keeps failing which then stresses the BU508.
 

When looking for suitable transistor replacements it is necessary to look at the main specifications for the transistor. Once the transistor specifications and parameters have been ascertained, it is possible to check for other replacement transistor types with similar parameters that will be able to operate within the circuit in question.
When considering any possible replacement transistors, it is necessary to look at a variety of parameters. These will include the basic parameters of the transistor operation performance. They will also include the environmentally related parameters, and the physical parameters. All these need to be taken into account when choosing a suitable replacement transistor.

 What is This Diode Across My HOT?
It is called a damper diode and is essential to proper operation of the TV's or monitor's horizontal deflection as well as to the continued life and happiness of the HOT. Using an HOT with an internal damper is OK even if there is a separate one in the circuit. The other way around (leaving it out entirely) will likely result in instant - i.e., single scan - destruction of the HOT. This is because in modern deflection system designs, the damper carries the horizontal yoke current for a significant portion of the scan. If it is not present, the HOT will be forced to try to eat this current - in reverse - across C-E.

The damper is a special high voltage fast recovery type of diode - a 1N400x type will not work in its place.

BTW, many of these HOTs have a D after the part number to indicate that they have the internal damper and include a B-E resistor (which may confuse transistor testing) of about 50 ohms. However, the D is not a sure indication of an internal damper - nor is its absence an indication of a lack thereof. The entire part number must be checked to be sure.

What is This Funny Capacitor (or Capacitors) Across My HOT?
These may go by the name flyback, high voltage, snubber, or deflection capacitors. When the HOT is shut off, the current flowing in the inductance of the flyback primary and horizontal deflection yoke cannot be stopped instantly. These capacitors provide a place for this current to go and is part of a tuned circuit (in combination with the flyback and yoke) which needed to accomplish the flyback function.

If this capacitor is open or missing, excessive flyback voltage will result probably killing the HOT. If the HOT does not fail, the result will likely be greatly increased high voltage. Should the X-ray protection circuitry not shut down the deflection, there could be internal or external arcing and/or destruction of components like the flyback or tripler.

For proper operation and continued safety, only proper exact replacements should be used for these parts.


Typical HOT Dissipation:
Just measuring the actual power dissipation in a HOT is not trivial due to the nasty shapes of the voltage and current waveforms. You can't do this with your DMM! A couple of ways of doing this are:

  •     Monitor the voltage and current waveforms for the HOT. Integrate the instantaneous measured V*I over the duration of one scan line and multiply by the horizontal scan rate.
  •     Mount the HOT and a fixed power resistor on identical heat sinks so that their thermal enviroments are the same. Then, adjust the current through the resistor (and thus its power dissipation) so that the temperature rise of the heat sinks for the two are equal.

Here are some measured values for TV HOTs with optimized drive:

(From: David, a Philips application engineer).................

    14-21", 16 kHz: About 1 W      (some have the HOT running in free-air)
    21-36", 16 kHz: Less than 2 W  (some new large CRT's only need 9 A p-p)
    25-36", 32 kHz: Less than 4 W  (dissipation really is prop. to frequency)

I am sure I don't need to tell you that the dissipation varies with the type of HOT used and the drive.

Why Do Apparently Similar or Better HOTs Sometimes Run Hot and Blow?
 
It is often surprising that replacing a horizontal output transistor with one that has overall better specifications does not work out - it may run hot and fail.

There is more to characterizing a transistor than just maximum voltage, current, and power dissipation.

One important parameter is current gain: Too low a gain for a particular operating point may result in incomplete turn-on during scan resulting in high dissipation. You want the transistor to be in the fully saturated state. A larger HOT is more likely to have a lower current gain.

If you read the app notes put out by the manufacturers like Motorola you will also find that fast turn off based drive (negative step) is actually not what you want since this traps excess carriers in the high resistivity collector region which leads to continued conduction and heating. The ideal waveform also provide adequate drive during scan but not excessive overdrive and is thus an increasing ramp to account for the increasing collector current during scan.

Characteristics like this are not dealt with by the basic specs but can differ substantially among otherwise similar transistors.

****** When looking for a suitable transistor replacement some of the basic transistor parameters that need to be considered include the following:

  1. Semiconductor material used:   Most transistors will either be germanium or silicon. Other types are normally only used in very specialist applications. It is important to know what type the transistor is because there is a difference in the base emitter forward bias voltage drop. For germanium it is around 0.2 - 0.3 volts and for silicon it is around 0.6 volts. The circuit will be designed around a particular voltage drop.
  2. Polarity:   It is absolutely imperative to find out whether the transistor is either NPN or PNP variety. Install the incorrect type and it experience the inverse of all the voltages it would expect and is likely to be destroyed.
  3. General application:   Although it is not always necessary to exactly match the intended purpose for the transistor, a variety of areas of its performance will be tailored to its intended applications. Possible application types may include: switching, analogue, low power, RF amplifier, low noise, etc. Put in the correct type and it may not perform well. For example a low power general-purpose transistor is unlikely to work well in a switching application even if it has a high ft or frequency limit.
  4. Package and pin-out:   Transistors have many packages. It is often necessary to match the replacement transistor package as closely as possible to enable the transistor to physically fit. Also the package may give an indication of other parameters.
  5. Voltage breakdown:   It is necessary to make sure that the transistor is able to withstand the voltages it is likely to see. Transistor parameters such as Vceo, etc need to be checked.
  6. Current gain:   , The current gain parameter of a transistor normally has a very wide spread. This is normally quoted as Β or hfe. Although they are slightly different, for all circuit equivalences of this nature these transistor parameters are the same. Choosing a replacement transistor with approximately the same current gain is necessary. Normally it is not a problem to choose a replacement transistor with a higher gain. Often a lower current gain may be acceptable.
  7. Frequency limit:   The upper frequency limit for a transistor is normally quoted as its ft. It is normally important to ensure that the transistor can meet any frequency limits.
  8. Power dissipation:   It is necessary to ensure that the replacement transistor can dissipate sufficient power. Often the package type is a good indication of this.

These are the main parameters that are of importance in most applications, but be on the look out for any other transistor parameters that may need to be included in the selection of the replacement transistor.Picking a replacement transistor
When choosing a suitable replacement transistor for use within an electronic circuit, there are several stages that must be considered when making the choice. These can be progressed in a logical order to narrow down the choice and enable the best alternative for the replacement transistor to be made.

Step by step instructions:

  1. Choose a transistor of the same polarity:   The first major selection criterion is whether the transistor is PNP or NPN.
  2. Select a replacement transistor of the same material:   Most transistors are either silicon or germanium. As bias voltages and other features are different it is necessary to select a replacement transistor with the same material.
  3. Select the same functional type of transistor:   Transistors are normally given an indication of their application in the datasheets. The replacement should have the same application if possible.
  4. Choose a replacement with the same package:   Choosing a replacement transistor with the same package and pin-out will mean that many of the characteristics including power capability are the same. Ensuring with pin-out is the same (most but not all transistors have their leads in order - EBC) will save many problems with fitting.
  5. Select a replacement transistor with the same breakdown voltage:   Ensure that figures for VCEO and VCBO etc are at least as high as the original transistor.
  6. Check it can take the current:   Ensure that the replacement transistor can pass the required current - it should have an ICmax greater than or equal to the original transistor.
  7. Select a transistor with a similar Hfe:   It is necessary to ensure that the current gain of the replacement transistor is about the same as the original. Current gain values normally vary widely even for transistors of the same type so some variation will be acceptable.
  8. Select a replacement transistor with equivalent Ft:   It is necessary to ensure that the replacement transistor will be able to operate at the relevant frequencies, so a similar or slightly higher Ft is advisable. Don't go for a transistor with a much higher Ft as this may increase the risk of oscillation.
  9. Choose a transistor with a similar power dissipation :   It is necessary to ensure that the replacement transistor can handle the power that it will dissipate within the circuit. Choosing a replacement transistor with a similar can style will often mean that both transistors have a similar power dissipation.
  10. Check for any special features:   While ensuring the features above are selected, there may be some additional features that need to be considered. These are normally required when transistors are used in specialist applications.


Once the choice of replacement transistor has been made, then it can be installed in the circuit, and the performance checked. In most cases it will operate satisfactorily, but occasionally there may be a problem. If this is the case, it is necessary to re-visit the way in which the choice of the replacement transistor was made and see if any mistakes were made or look for other parameters that may affect the operation of the transistor circuit.

part N/P V (V) Ic (A) Ic pulse (A) P (W) Tf (ns) hfe Vce sat (V) Pack Manuf
2SC3686 Si.N 1500 7 16 120 100 >8 <5 TO_3PB SANYO
2SC3687 Si.N 1500 8 25 150 100 >8 <5 TO_3PB SANYO
2SC3688 Si.N 1500 10 25 150 100 >8 <5 TO_3PB SANYO
2SC3894 Si.N 1500 6 16 60 100 4…8 <5 TO_3PML SANYO
2SC3895 Si.N 1500 7 16 60 100 4…8 <5 TO_3PML SANYO
2SC3896 Si.N 1500 8 25 70 100 4…8 <5 TO_3PML SANYO
2SC3897 Si.N 1500 10 25 70 100 4…8 <5 TO_3PML SANYO
2SC3995 Si.N 1500 12 30 180 100 4...8 <5 TO_3PBL SANYO
2SC3996 Si.N 1500 15 35 180 100 4...8 <5 TO_3PBL SANYO
2SC3997 Si.N 1500 20 40 250 100 4...8 <5 TO_3PBL SANYO
2SC3998 Si.N 1500 25 50 250 100 4...8 <5 TO_3PBL SANYO
2SC4123 Si.N+D 1500 7 16 60 100 4...6 <5 TO_3PML SANYO
2SC4124 Si.N+D 1500 8 25 70 100 4…6 <5 TO_3PML SANYO
2SC4125 Si.N+D 1500 10 25 70 100 4...6 <5 TO_3PML SANYO
2SC4742 Si.N+D 1500 6 7/16 50 <400 <25 (1A) <2 (5A) TO_3P HITACHI
2SC4744 Si.N+D 1500 6 7/16 50 <400 <25 (1A) <2 (5A) TO_3PFM HITACHI
2SC4745 Si.N 1500 6 7/16 50 200 7…30 <5 TO_3PFM HITACHI
2SC4747 Si.N 1500 10 20 50 <300 <30 (1A) <5 TO_3PFM HITACHI
2SC4769 Si.N+D 1500 7 16 60 100 3...8 <5 TO_3PML SANYO
2SC4891 Si.N 1500 15 35 75 100 4...8 <5 TO_3PML SANYO
2SC4923 Si.N 1500 8 25 70 100 4…8 <5 TO_3PML SANYO
2SC4924 Si.N 1500 10 25 70 100 4…8 <5 TO_3PML SANYO
2SC4927 Si.N+D 1500 8 9/18 50 <500(31.5kHz) <25 (1A) <5 TO_3PFM HITACHI
2SC4928 Si.N 1500 15 20 150 <500 <38(1A) <5 TO_3PL HITACHI
2SC5002 Si.N 1500 7 14 80 <200 4…9 <5 TO_3PF ?
2SC5003 Si.N+D 1500 7 14 80 <200 4…9 <5 TO_3PF ?
2SC5041 Si.N+D 1600 7 16 60 100 4...7 <5 TO_3PML SANYO
2SC5042 Si.N 1600 7 16 60 100 4...7 <5 TO_3PML SANYO
2SC5043 Si.N+D 1600 10 25 70 100 4...7 <5 TO_3PML SANYO
2SC5044 Si.N 1600 10 25 70 100 4...7 <5 TO_3PML SANYO
2SC5045 Si.N 1600 15 35 75 100 4...7 <5 TO_3PML SANYO
2SC5046 Si.N 1600 15 35 180 100 4...7 <5 TO_3PBL SANYO
2SC5047 Si.N 1600 25 50 250 100 4...7 <5 TO_3PBL SANYO
2SC5048 Si.N 1500 12 24 50 150 4...8 <3 2_16E3A TOSHIBA
2SC5105 Si.N 1500 12 20 50 200 <35(1A) <5 TO_3PFM HITACHI
2SC5129 Si.N 1500 10 20 50 150 4...8 <3 2_16E3A TOSHIBA
2SC5132A Si.N+D 1500 8 16 50 200 <25 (1A) <5 TO_3PFM HITACHI
2SC5142 Si.N 1500 20 40 200 150 4,5...8,5 <3 2_21F2A TOSHIBA
2SC5143 Si.N+D 1700 10 20 50 200 4...8 <3 2_16E3A TOSHIBA
2SC5144 Si.N 1700 20 40 200 150 4,5...8,5 <3 2_21F2A TOSHIBA
2SC5148 Si.N 1500 8 16 50 150 4...8 <5 2_16E3A TOSHIBA
2SC5149 Si.N+D 1500 8 16 50 200 4...8 <5 2_16E3A TOSHIBA
2SC5150 Si.N 1700 10 20 50 150 4...8 <3 2_16E3A TOSHIBA
2SC5207A Si.N 1500 10 20 50 200 8…30 <5 TO_3PFM HITACHI
2SC5243 Si.N 1700 15 30 200 120 5...12 <3 TOP_3L PANASONIC
2SC5244 Si.N 1500 20 30 200 120 5...12 <3 TOP_3L PANASONIC
2SC5244A Si.N 1600 20 30 200 120 5...12 <3 TOP_3L PANASONIC
2SC5250 Si.N+D 1500 8 16 50 200 4...7 <5 TO_3PFM HITACHI
2SC5251 Si.N 1500 12 24 50 200 5...9 <5 TO_3PFM HITACHI
2SC5270 Si.N 1500 12 20 120 120 5...12 <3 TOP_3E PANASONIC
2SC5270A Si.N 1600 12 20 120 120 5...12 <3 TOP_3E PANASONIC
2SC5280 Si.N+D 1500 8 16 50 <200 4...8,5 <5 2_16E3A TOSHIBA
2SC5296 Si.N+D 1500 8 16 60 100 4...7 <5 TO_3PML SANYO
2SC5297 Si.N 1500 8 16 60 100 4...7 <5 TO_3PML SANYO
2SC5299 Si.N 1500 10 25 70 100 4...7 <5 TO_3PML SANYO
2SC5300 Si.N 1500 20 40 150 100 4...7 <5 TO_3PML SANYO
2SC5301 Si.N 1500 20 40 150 100 4...7 <5 TO_3JML SANYO
2SC5302 Si.N 1500 15 35 75 100 4...7 <5 TO_3PML SANYO
2SC5331 Si.N 1500 15 30 180 120 4...7 <5 2_21F2A TOSHIBA
2SC5332 Si.N 1700 14 28 200 150 4…8,5 <3 2_21F2A TOSHIBA
2SC5339 Si.N+D 1500 7 14 50 200 4...8 <5 2_16E3A TOSHIBA
2SC5380 Si.N 1500 16 20 100 <300 8...16 <5 TOP_3E PANASONIC
2SC5386 Si.N 1500 8 16 50 150 4...7 <5 2_16E3A TOSHIBA
2SC5387 Si.N 1500 10 20 50 150 4,3...7,8 <5 2_16E3A TOSHIBA
2SC5388 Si.N+Darl 1500 5 10 50 <800 50...150 <1,5 TO_3PML SANYO
2SC5404 Si.N 1500 9 18 50 150 4...8 <3 2_16E3A TOSHIBA
2SC5406 Si.N 1500 14 20 100 <300 5...12 <3 TOP_3E PANASONIC
2SC5407 Si.N 1700 15 20 100 <300 6...14 <3 TOP_3E PANASONIC
2SC5411 Si.N 1500 14 28 60 150 4...8 <3 2_16E3A TOSHIBA
2SC5412 Si.N 1700 4 8 50 <300 5...12 <3 TOP_3E PANASONIC
2SC5421 Si.N 1500 15 30 180 150 4...8 <3 2_21F2A TOSHIBA
2SC5422 Si.N 1700 15 30 200 150 4,5...8,5 <3 2_21F2A TOSHIBA
2SC5423 Si.N 1700 15 30 100 <200 5...12 <3 TOP_3E PANASONIC
2SC5440 Si.N 1500 15 25 60 <200 5...12 <3 TOP_3E PANASONIC
2SC5443 Si.N 1500 20 40 180 100 4...7 <5 TO_3PBL SANYO
2SC5444 Si.N 1500 25 50 210 100 4...7 <5 TO_3PBL SANYO
2SC5445 Si.N 1500 20 40 200 100 4,5…8.5 <3 2_21F2A TOSHIBA
2SC5446 Si.N 1700 18 36 200 100 4…8 <3 2_21F2A TOSHIBA
2SC5447 Si.N+D 1500 8 16 50 150(64kHz) 4…6 <5 TO_3PFM HITACHI
2SC5448 Si.N 1500 10 20 50 150(64kHz) 3,5...6,5 <5 TO_3PFM HITACHI
2SC5449 Si.N 1500 12 24 50 150(64kHz) 3,5...6,5 <5 TO_3PFM HITACHI
2SC5514 Si.N 1500 13 23 50 <200 5...9 <3 TOP_3E PANASONIC
2SC5516 Si.N 1500 20 30 70 <200 7...14 <3 TOP_3E PANASONIC
2SC5517 Si.N+D 1600 6 20 40 300...500 4,5...8 <5 TOP_3E PANASONIC
2SC5518 Si.N+D 1500 7 14 40 <500 5...9 <5 TOP_3E PANASONIC
2SC5519 Si.N+D 1700 8 16 50 <500 5...10 <5 TOP_3E PANASONIC
2SC5521 Si.N 1500 13 ? 50 <200 5...9 <3 TOP_3D PANASONIC
2SC5522 Si.N+D 1700 6 20 40 300...500 4,5...8 <3 TOP_3D PANASONIC
2SC5523 Si.N+D 1500 7 14 40 <500 5...9 <3 TOP_3D PANASONIC
2SC5524 Si.N+D 1700 8 16 50 <500 5...10 <3 TOP_3D PANASONIC
2SC5570 Si.N 1700 28 56 220 100 4.5...7.5 <3 2_21F2A TOSHIBA
2SC5572 Si.N+D 1500 6 12 40 <500 5...9 <3 TOP_3E PANASONIC
2SC5583 Si.N 1500 17 30 150 <200 6...12 <3 TOP_3L PANASONIC
2SC5584 Si.N 1500 20 30 150 <200 7...14 <3 TOP_3L PANASONIC
2SC5587 Si.N 1500 17 34 75 100 9...8(7A) <3 2_16E3A TOSHIBA
2SC5588 Si.N 1700 15 30 75 100 5...8 <3 2_16E3A TOSHIBA
2SC5589 Si.N 1500 18 36 200 100 5...8 <3 2_21F2A TOSHIBA
2SC5590 Si.N 1700 16 32 200 100 5…18 <3 2_21F2A TOSHIBA
2SC5591 Si.N 1700 20 30 70 <200 7...14 <3 TOP_3E PANASONIC
2SC5612 Si.N 2000 22 44 220 150 4,8…9 <3 2_21F2A TOSHIBA
2SC5622 Si.N+D 1500 6 12 40 <500 5...9 <3 TOP_3D PANASONIC
2SC5657 Si.N+D 1500 4 8 40 <500 5...9 <5 TOP_3E PANASONIC
2SC5686 Si.N 2000 20 30 70 <200 7...14 <3 TOP_3E PANASONIC
2SC5748 Si.N 2000 16 32 210 150 4,8…7,5 <3 2_21F2A TOSHIBA
BU1506DX Si.N+D 1500 5 8 32 250 3,8...7,5 <1 SOT186A PHILIPS
BU1508AX Si.N 1500 8 15 35 400 3,5...7,5 <5 SOT186A PHILIPS
BU1508DX Si.N+D 1500 8 15 35 400 5,5…7.5 <5 SOT186A PHILIPS
BU1706A Si.N 1750 5 8 100 250 >8 <1 TO_220AB PHILIPS
BU1706AX Si.N 1750 5 8 32 250 >8 <1 SOT186A PHILIPS
BU2506DF Si.N+D 1500 5 8 45 250 3,8...7,5 <1 SOT199 PHILIPS
BU2506DX Si.N+D 1500 5 8 45 250 3,8...7,5 <1 SOT399 PHILIPS
BU2507AX Si.N 1500 8 15 45 250 5...9 <5 SOT399 PHILIPS
BU2508A Si.N 1500 8 15 125 400 4...7,5 <5 SOT93 PHILIPS
BU2508AF Si.N 1500 8 15 45 400 4…7.5 <5 SOT199 PHILIPS
BU2508AX Si.N 1500 8 15 45 400 4…7.5 <5 SOT399 PHILIPS
BU2508D Si.N+D 1500 7 15 125 400 4…7.5 <5 SOT93 PHILIPS
BU2508DF Si.N+D 1500 7 15 45 400 4…7.5 <5 SOT199 PHILIPS
BU2508DX Si.N+D 1500 7 15 45 400 4…7.5 <5 SOT399 PHILIPS
BU2515DX Si.N+D 1500 9 20 45 200(56kHz) 5...10 <5 SOT399 PHILIPS
BU2520A Si.N 1500 10 25 125 200 5...10 <5 SOT93 PHILIPS
BU2520AF Si.N 1500 10 25 45 200 5...10 <5 SOT199 PHILIPS
BU2520AX Si.N 1500 10 25 45 200 5...10 <5 SOT399 PHILIPS
BU2520D Si.N+D 1500 10 25 125 350 5...10 <5 SOT93 PHILIPS
BU2520DF Si.N+D 1500 10 25 45 350 5...10 <5 SOT199 PHILIPS
BU2520DX Si.N+D 1500 10 25 45 350 5...10 <5 SOT399 PHILIPS
BU2522A Si.N 1500 10 25 125 120 5...8 <5 SOT93 PHILIPS
BU2522AF Si.N 1500 10 25 45 120 5...8 <5 SOT199 PHILIPS
BU2522AX Si.N 1500 10 25 45 120 5...8 <5 SOT399 PHILIPS
BU2522DX Si.N+D 1500 10 25 45 120 5...10 <5 SOT399 PHILIPS
BU2523AF Si.N 1500 11 29 45 150(64kHz) 5…10 <5 SOT199 PHILIPS
BU2525A Si.N 1500 12 30 125 200 5...10 <5 SOT93 PHILIPS
BU2525AF Si.N 1500 12 30 45 200 5...10 <5 SOT199 PHILIPS
BU2525AX Si.N 1500 12 30 45 200 5…10 <5 TOP_3D PHILIPS
BU2525DF Si.N+D 1500 12 30 45 200 5...9 <5 SOT199 PHILIPS
BU2527A Si.N 1500 12 30 125 100(64kHz) 5...9 <5 SOT93 PHILIPS
BU2527AF Si.N 1500 12 30 45 100 5...9 <5 SOT199 PHILIPS
BU2527AX Si.N 1500 12 30 45 100 5...9 <5 SOT399 PHILIPS
BU2527DX Si.N+D 1500 12 30 45 100 5...10 <5 SOT399 PHILIPS
BU2530AL Si.N 1500 16 40 125 <350 10...30(1A) <5 SOT430 PHILIPS
BU2530AW Si.N 1500 16 40 125 140 5,5…10 <5 SOT429 PHILIPS
BU2532AL Si.N 1500 16 40 125 60(82kHz) 6…12,5 <5 SOT430 PHILIPS
BU2532AW Si.N 1500 16 40 125 60(82kHz) 6…12,5 <5 SOT429 PHILIPS
BU2708AF Si.N 1700 8 15 45 400 3...7,3 <1 SOT199 PHILIPS
BU2708DF Si.N+D 1700 8 15 45 400 3...7,3 <1 SOT199 PHILIPS
BU2720AF Si.N 1700 10 25 45 700 4...7,5 <1 SOT199 PHILIPS
BU2722AF Si.N 1700 10 25 45 190 4...10 <1 SOT199 PHILIPS
BU2725DX Si.N+D 1700 12 30 45 600(16khz) 3,8...7,5 <1 SOT399 PHILIPS
BU2727A Si.N 1700 12 30 125 64kHz 5,5...11 <1 SOT93 PHILIPS
BU2730AL Si.N 1700 16 40 125 32kHz 5...9 <5 SOT430 PHILIPS
BU4506AF Si.N 1500 5 8 45 300 4,2...7,3 <3 SOT199 PHILIPS
BU4506DX Si.N+D 1500 5 8 45 300 4,2...7,3 <3 SOT399 PHILIPS
BU4506DZ Si.N+D 1500 5 8 32 300 4,2...7,3 <3 SOT186A PHILIPS
BU4507DX Si.N+D 1500 8 15 45 300 4,2...7,3 <3 SOT399 PHILIPS
BU4508DF Si.N+D 1500 8 15 45 300 4,2...7,3 <3 SOT199 PHILIPS
BU4515AF Si.N 1500 9 20 45 230(64kHz) 4,2...7,3 <3 SOT199 PHILIPS
BU4515DF Si.N+D 1500 9 20 45 64kHz 4,2...7,3 <3 SOT199 PHILIPS
BU4522DF Si.N+D 1500 10 25 45 64kHz 4,2...5,8 <3 SOT199 PHILIPS
BU4523DF Si.N+D 1500 11 29 45 70kHz 4,2...5,8 <3 SOT199 PHILIPS
BU4525DF Si.N+D 1500 12 30 45 70kHz 4,2...5,8 <3 SOT199 PHILIPS
BU4525DL Si.N+D 1500 14 30 125 70kHz 4,2...5,8 <3 SOT430 PHILIPS
BU4530AL Si.N 1500 16 40 125 120(90kHz) 4,8...8,5 <3 SOT430 PHILIPS
BU4530AW Si.N 1500 16 40 125 120(90kHz) 4,8…8,5 <3 SOT429 PHILIPS
BU4530AX Si.N 1500 16 40 45 120(90kHz) 4,2…6.5 <3 SOT399 PHILIPS
BU4540AL Si.N 1500 25 40 125 110kHz 4,2…6,5 <3 SOT430 PHILIPS
BU4540AW Si.N 1500 25 40 125 110kHz 4,2…6,5 <3 SOT429 PHILIPS
BU4550AL Si.N 1500 25 40 125 130kHz 4,2…6,5 <3 SOT430 PHILIPS
BU508AF Si.N 1500 8 15 35 700 6...13 <3 SOT199 PHILIPS
BU508AFI Si.N 1500 8 15 50 550 6...13 <3 ISOWATT218 ST
BU508D(Sanyo) Si.N+D 1500 5 16 50 400 >2,5 <1,3 2022 SANYO
BU808DFI Si.N+Darl 1400 8 10 52 800 60...230 <1,6 ISOWATT218 ST
BUH1015 Si.N 1500 14 18 160 110 7…14 <1,5 TO218 ST
BUH1015HI Si.N 1500 14 18 70 110 7…14 <1,5 ISOWATT218 ST
BUH1215 Si.N 1500 16 22 200 110 7...14 <1,5 TO218 ST
BUH313 Si.N 1300 5 8 44 270 >3.5 <1,5 ISOWATT218 SGS-THOMSON
BUH313D Si.N+D 1300 5 8 44 270 >3.5 <1,5 ISOWATT218 SGS-THOMSON
BUH315 Si.N 1500 6 12 44 270 3.,5…12 <1,5 ISOWATT218 ST
BUH315D Si.N+D 1500 6 12 44 400 2,5…9 <1,5 ISOWATT218 ST
BUH417 Si.N 1700 7 12 55 330 >4 <1,5 ISOWATT218 ST
BUH515 Si.N 1500 8 12 50 200 6...12 <1,5 ISOWATT218 ST
BUH515D Si.N+D 1500 8 15 50 450 5...10 <1,5 ISOWATT218 ST
BUH517 Si.N 1700 8 15 60 200 4…6 <1,5 ISOWATT218 ST
BUH715 Si.N 1500 10 20 57 320 5...16 <1,5 ISOWATT218 ST
FJAF6810D Si.N+D 1500 10 20 60 100 5...8 <3 TO_3PF FAIRCHILD
FJAF6812 Si.N 1500 12 24 60 100 5...8 <3 TO_3PF FAIRCHILD
FJAF6815 Si.N 1500 15 25 60 100 5...8 <3 TO_3PF FAIRCHILD
FJAF6820 Si.N 1500 20 30 60 150 5,5...8,5 <3 TO_3PF FAIRCHILD
FJAF6910 Si.N 1700 10 20 60 150 7…10 <3 TO_3PF FAIRCHILD
FJAF6916 Si.N 1700 16 30 60 <300 6…9 <3 TO_3PF FAIRCHILD
FJAF6920 Si.N 1700 20 30 60 150 5,5...8,5 <3 TO_3PF FAIRCHILD
HPA100 Si.N+D 1500 10 25 150 100 4...10 <5 TO_3PBL SANYO
HPA150R Si.N+D 1500 15 35 180 100 4…10 <5 TO_3PBL SANYO
HPA72R Si.N+D 1500 7 16 150 100 4...10 <5 TO_3PML SANYO
KSC5086 Si.N+D 1500 7 16 50 100 >8 <5 TO_3PF FAIRCHILD
KSC5088 Si.N 1500 8 15 60 100 >5 <5 TO_3PF SAMSUNG
KSC5386 Si.N+D 1500 7 16 50 100 >8 <5 TO_3PF SAMSUNG
KSC5802 Si.N 1500 10 30 60 100 7...10 <3 TO_3PF FAIRCHILD
KSC5802D Si.N+D 1500 10 30 60 100 7…11,5 <3 TO_3PF FAIRCHILD
KSC5803D Si.N+D 1500 12 24 70 100 7…10 <3 TO_3PF FAIRCHILD
MJW16212 Si.N 1500 10 15 150 200 4...10 0,15 TO_247AE MOTOROLA
ST2408HI Si.N 1500 12 25 55 110 6...9 <3 ISOWATT218 ST
TS7988 Si.N 1600 10 25 70 <200 4...7 <5 TO3PML SANYO
TS7990 Si.N 1600 15 35 75 <200 4...7 <5 TO3PML SANYO
TS7994 Si.N 1600 25 50 210 <200 4...7 <5 TO3PBL SANYO
TT2050 Si.N+D 1500 12 25 80 <200 4...7 <3 TO_3PMLH SANYO
TT2054 Si.N 1500 12 25 80 <200 4...7 <3 TO_3PMLH SANYO
TT2062 Si.N 1500 18 35 85 <200 4...7 <3 TO_3PMLH SANYO
TT2066 Si.N 1500 24 40 95 <200 4...7 <3 TO_3PMLH SANYO
TT2068 Si.N 1500 30 50 100 <200 4...7 <3 TO_3PMLH SANYO 
2SC3884   SI-N   1400/600v, 6A, 50w      
2SC3884A  SI-N   1500/600v, 6A, 50w 
2SC3885   SI-N   1400/600v, 7A, 50w 
2SC3885A  SI-N   1500/600v, 7A, 50w 
2SC3886   SI-N   1400/600v, 8A, 50w 
2SC3886A  SI-N   1500/600v, 8A, 50w 
2SC4288   SI-N   1400/600v, 12A, 200w 
2SC4288A  SI-N   1500/600v, 12A, 200w 
2SC4758   SI-N   1500/600v, 8A, 50w 
2SC4759   SI-N   1500/600v, 10A, 50w 
2SC4770   SI-N   1500/800v, 7A, 60w 
2SC4916   SI-N+D 1500/600v, 7A, 50w 
2SC5695   SI-N   1500/700v, 22A, 200w 
2SC5716   SI-N+D 1700/700v, 8A, 55w 
2SC5717   SI-N   1500/700v, 21A, 75w 
BUH517D   SI-N+D 1700/700v, 8A, 60w
 
  
part / manufactured / analog - corresponding (PHILIPS)
2SC3162 SHINDENGEN BUJ103A
2SC3163 SHINDENGEN BUJ105A
2SC3681 SANYO BU4507DX
2SC3682 SANYO BU2508DW
2SC3683 SANYO BU2520DW
2SC3685 SANYO BU4507AX
2SC3686 SANYO BU4508AX
2SC3687 SANYO BU2520AW
2SC3688 SANYO BU4530AW
2SC3884A TOSHIBA BU4508AX
2SC3885A TOSHIBA BU4515AX
2SC3886A TOSHIBA BU4522AX
2SC3887A TOSHIBA BU4508AX
2SC3888A TOSHIBA BU4515AX
2SC3889A TOSHIBA BU2520AW
2SC3892A TOSHIBA BU4508DX
2SC3893A TOSHIBA BU4522DX
2SC3894 SANYO BU4507AX
2SC3895 SANYO BU4508AX
2SC3896 SANYO BU4522AX
2SC3897 SANYO BU4530AL
2SC3995 SANYO BU4530AL
2SC3996 SANYO BU4530AL
2SC3997 SANYO BU4540AL
2SC3998 SANYO BU4540AL
2SC4023 SANKEN BU2520AW
2SC4051 SHINDENGEN BUJ202A
2SC4052 SHINDENGEN BUJ202AX
2SC4053 SHINDENGEN BUJ204A
2SC4054 SHINDENGEN BUJ204AX
2SC4055 SHINDENGEN BUJ205A
2SC4056 SHINDENGEN BUJ205AX
2SC4122 SANYO BU4507DX
2SC4123 SANYO BU4508DX
2SC4124 SANYO BU4522DX
2SC4230 SHINDENGEN BU1706A
2SC4231 SHINDENGEN BU1706AX
2SC4233 SHINDENGEN BU1706A
2SC4234 SHINDENGEN BU1706AX
2SC4288A TOSHIBA BU4540AL
2SC4289A TOSHIBA BU4540AL
2SC4290A TOSHIBA BU4550AL
2SC4291 SANYO BU4507DX
2SC4292 SANYO BU2508DW
2SC4293 SANYO BU4507DX
2SC4294 SANYO BU4508DX
2SC4310 SHINDENGEN BU1706A
2SC4311 SHINDENGEN BU1706AX
2SC4435 SANYO BU4508AX
2SC4436 SANYO BU4515AX
2SC4437 SANYO BU4508AX
2SC4438 SANYO BU4515AX
2SC4531 TOSHIBA BU4523DX
2SC4532 TOSHIBA BU4730AL
2SC4542 TOSHIBA BU4525AX
2SC4560 TOSHIBA BU4525AW
2SC4589 HITACHI BU4525AF
2SC4692 HITACHI BU4530AL
2SC4742 HITACHI BU2508DW
2SC4743 HITACHI BU4508AX
2SC4744 HITACHI BU4508DF
2SC4745 HITACHI BU4515AF
2SC4746 HITACHI BU4523AF
2SC4746A HITACHI BU4523AF
2SC4747 HITACHI BU4540AL
2SC4757 TOSHIBA BU4515AX
2SC4758 TOSHIBA BU4522AX
2SC4759 TOSHIBA BU4525AX
2SC4761 TOSHIBA BU2722AX
2SC4762 TOSHIBA BU4508DX
2SC4763 TOSHIBA BU4522DX
2SC4764 TOSHIBA BU4507DX
2SC4765 TOSHIBA BU2708DX
2SC4766 TOSHIBA BU2720DX
2SC4769 SANYO BU4508DX
2SC4770 SANYO BU4508AX
2SC4789 HITACHI BU4550AL
2SC4796 HITACHI BU2727AF
2SC4797 HITACHI BU2727AF
2SC4806 TOSHIBA BU2708AX
2SC4830 TOSHIBA BU4508AX
2SC4877 HITACHI BU4523DF
2SC4879 HITACHI BU2727AF
2SC4880 HITACHI BU4730AL
2SC4890 SANYO BU4540AL
2SC4891 SANYO BU4540AL
2SC4897 HITACHI BU4550AL
2SC4916 TOSHIBA BU4508DX
2SC4923 SANYO BU4522AX
2SC4924 SANYO BU4522AX
2SC4927 HITACHI BU4522DF
2SC4928 HITACHI BU4550AL
2SC4962 HITACHI BU2727DF
2SC4963 HITACHI BU2727DF
2SC5002 SANKEN BU4522AF
2SC5003 SANKEN BU4522DF
2SC5041 SANYO BU2708DX
2SC5042 SANYO BU2708AX
2SC5043 SANYO BU2727DX
2SC5044 SANYO BU2727AX
2SC5045 SANYO BU4730AL
2SC5046 SANYO BU4730AL
2SC5048 TOSHIBA BU4523AX
2SC5058 HITACHI BU4730AL
2SC5067 HITACHI BU4522AF
2SC5068 HITACHI BU4523AF
2SC5105 HITACHI BU4530AL
2SC5129 TOSHIBA BU4515AX
2SC5132A HITACHI BU4508DF
2SC5133 HITACHI BU4515DX
2SC5142 TOSHIBA BU4550AL
2SC5143 TOSHIBA BU2727DX
2SC5148 TOSHIBA BU4508AX
2SC5149 TOSHIBA BU4508DX
2SC5150 TOSHIBA BU2727AX
2SC5207 HITACHI BU4522AF
2SC5207A HITACHI BU4522AF
2SC5219 HITACHI BU2727DF
2SC5250 HITACHI BU4508DF
2SC5251 HITACHI BU4522AF
2SC5252 HITACHI BU4525AF
2SC5286 HITACHI BU2727AF
2SC5296 SANYO BU4508DX
2SC5297 SANYO BU4522AX
2SC5298 SANYO BU4522AX
2SC5299 SANYO BU4522AX
2SC5302 SANYO BU4530AL
2SC5306 HITACHI BU4540AL
2SC5326 HITACHI BU4508AF
2SC5331 TOSHIBA BU4530AL
2SC5332 TOSHIBA BU2727AW
2SC5339 TOSHIBA BU4508DX
2SC5386 TOSHIBA BU4515AX
2SC5387 TOSHIBA BU4522AX
2SC5404 TOSHIBA BU4522AX
2SC5421 TOSHIBA BU4530AL
2SC5422 TOSHIBA BU4730AL
2SC5427 HITACHI BU4522AF
2SC5440 MATSUSHITA BU4525AX
2SC5445 TOSHIBA BU4540AL
2SC5447 HITACHI BU4507AF
2SC5448 HITACHI BU4515AF
2SC5456 MATSUSHITA BU4530AL
2SC5478 MATSUSHITA BU2727AX
2SC5513 MATSUSHITA BU4522AX
2SC5514 MATSUSHITA BU4523AX
2SC5515 MATSUSHITA BU4530AL
2SC5516 MATSUSHITA BU4540AL
2SD1391 MATSUSHITA BU4508AX
2SD1396 SANYO BU505D
2SD1397 SANYO BU4505DX
2SD1398 SANYO BU4507DX
2SD1399 SANYO BU2508DW
2SD1400 SANYO BU505
2SD1401 SANYO BU4505AX
2SD1402 SANYO BU4507AX
2SD1403 SANYO BU4508AX
2SD1425 TOSHIBA BU505D
2SD1426 TOSHIBA BU4506DX
2SD1427 TOSHIBA BU4507DX
2SD1428 TOSHIBA BU2508DW
2SD1429 TOSHIBA BU505
2SD1430 TOSHIBA BU4506AX
2SD1431 TOSHIBA BU4507AX
2SD1432 TOSHIBA BU4508AX
2SD1433 TOSHIBA BU2520AW
2SD1439 MATSUSHITA BU4506DX
2SD1440 MATSUSHITA BU4505DX
2SD1441 MATSUSHITA BU4507DX
2SD1479 MATSUSHITA BU505
2SD1541 MATSUSHITA BU4506DF
2SD1543 TOSHIBA BU4504AX
2SD1544 TOSHIBA BU4506AX
2SD1545 TOSHIBA BU4507AX
2SD1546 TOSHIBA BU4508AX
2SD1547 TOSHIBA BU4522AX
2SD1553 TOSHIBA BU4504DX
2SD1554 TOSHIBA BU4506DX
2SD1555 TOSHIBA BU4507DX
2SD1556 TOSHIBA BU4508DX
2SD1575 MATSUSHITA BU4504AF
2SD1576 MATSUSHITA BU4505AF
2SD1577 MATSUSHITA BU4508AF
2SD1577FI ST (SGS-THOMSON) BU4508AX
2SD1632 MATSUSHITA BU4507DF
2SD1649 SANYO BU4504DX
2SD1650 SANYO BU4505DX
2SD1651 SANYO BU4507DX
2SD1652 SANYO BU4508DX
2SD1653 SANYO BU4504AX
2SD1654 SANYO BU4505AX
2SD1655 SANYO BU4507AX
2SD1656 SANYO BU4508AX
2SD1663 MATSUSHITA BU4508AF
2SD1677 SANYO BU4508AX
2SD1709 SANYO BU2508DW
2SD1710 SANYO BU4508AX
2SD1711 SANYO BU4508DX
2SD1727 MATSUSHITA BU505DF
2SD1728 MATSUSHITA BU4505DX
2SD1729 MATSUSHITA BU4507DX
2SD1730 MATSUSHITA BU4507DX
2SD1731 MATSUSHITA BU2520DW
2SD1732 MATSUSHITA BU4523DW
2SD1734 MATSUSHITA BU505F
2SD1735 MATSUSHITA BU505F
2SD1736 MATSUSHITA BU4505AF
2SD1737 MATSUSHITA BU4507AF
2SD1738 MATSUSHITA BU4508AF
2SD1739 MATSUSHITA BU4522AF
2SD1844 MATSUSHITA BU505DF
2SD1845 MATSUSHITA BU4505DF
2SD1846 MATSUSHITA BU4507DF
2SD1847 MATSUSHITA BU4508DF
2SD1848 MATSUSHITA BU4522DF
2SD1849 MATSUSHITA BU4523DF
2SD1850 MATSUSHITA BU4523AF
2SD1876 SANYO BU4504DX
2SD1877 SANYO BU4505DX
2SD1878 SANYO BU4507DX
2SD1879 SANYO BU4508DX
2SD1880 SANYO BU4522DX
2SD1881 SANYO BU4525DX
2SD1882 SANYO BU4504AX
2SD1883 SANYO BU4505AX
2SD1884 SANYO BU4507AX
2SD1885 SANYO BU4508AX
2SD1886 SANYO BU4522AX
2SD1887 SANYO BU4525AX
2SD2001 MATSUSHITA BU505F
2SD2057 MATSUSHITA BU4523DF
2SD2089 TOSHIBA BU4504DX
2SD2095 TOSHIBA BU4507DX
2SD2125 TOSHIBA BU4508DX
2SD2251 SANYO BU4508AX
2SD2252 SANYO BU4508AX
2SD2253 TOSHIBA BU2720DX
2SD2293 HITACHI BU4505DX
2SD2294 HITACHI BU4505AX
2SD2295 HITACHI BU2508DW
2SD2296 HITACHI BU4508AX
2SD2297 HITACHI BU2508DW
2SD2298 HITACHI BU4508AX
2SD2299 HITACHI BU4505DF
2SD2300 HITACHI BU4508DF
2SD2301 HITACHI BU4508AF
2SD2310 MATSUSHITA BU505F
2SD2311 HITACHI BU4508AF
2SD2329 MATSUSHITA BU4507AF
2SD2330 MATSUSHITA BU4523AF
2SD2348 TOSHIBA BU4522DX
2SD2349 TOSHIBA BU4523DX
2SD2354 MATSUSHITA BU4523AW
2SD2367 MATSUSHITA BU4504DX
2SD2368 MATSUSHITA BU4506AX
2SD2369 MATSUSHITA BU4506DX
2SD2370 MATSUSHITA BU4507AX
2SD2371 MATSUSHITA BU4508DX
2SD2372 MATSUSHITA BU4507AX
2SD2373 MATSUSHITA BU4508AX
2SD2381 HITACHI BU4505AF
2SD2428 TOSHIBA BU2725DW
2SD2454 TOSHIBA BU2720DX 
2SD2498 TOSHIBA BU4508AX
2SD2499 TOSHIBA BU4508DX
2SD2500 TOSHIBA BU4523AX
2SD2510 MATSUSHITA BU4506DX
2SD2511 MATSUSHITA BU4506AX
2SD2512 MATSUSHITA BU4508DX
2SD2513 MATSUSHITA BU4508AX
2SD2514 MATSUSHITA BU4523DX
2SD2515 MATSUSHITA BU4523AX
2SD2521 MATSUSHITA BU2708DX
2SD2523 MATSUSHITA BU2720DX
2SD2539 TOSHIBA BU4522DX
2SD2550 TOSHIBA BU2708DX
2SD2551 TOSHIBA BU2720DX
2SD2552 TOSHIBA BU2720DX
2SD2553 TOSHIBA BU2725DX
2SD818 TOSHIBA BU505
2SD819 TOSHIBA BU4506AX
2SD820 TOSHIBA BU4507AX
2SD821 TOSHIBA BU4508AX
2SD822 TOSHIBA BU2520AW
2SD868 TOSHIBA BU505D
2SD869 TOSHIBA BU4506DX
2SD870 TOSHIBA BU4507DX
2SD871 TOSHIBA BU2508DW
BU208A ST (SGS-THOMSON) BU4508AX
BU208D ST (SGS-THOMSON) BU4508AX
BU505 ST (SGS-THOMSON) BU1706A
BU505 ST (SGS-THOMSON) BU505
BU508 MOTOROLA BU508AW
BU508 SANYO BU508AW
BU508 ST (SGS-THOMSON) BU508AW
BU508 TELEFUNKEN BU508AW
BU508A MOTOROLA BU508AW
BU508A SANYO BU508AW
BU508A ST (SGS-THOMSON) BU508AW
BU508A TELEFUNKEN BU508AW
BU508AD MOTOROLA BU508DW
BU508AD ST (SGS-THOMSON) BU508DW
BU508AD TELEFUNKEN BU508DW
BU508ADF SAMSUNG BU508DW
BU508AF SAMSUNG BU508AX
BU508AFI ST (SGS-THOMSON) BU508AX
BU508AXI ST (SGS-THOMSON) BU4508AZ
BU508D SANYO BU508DW
BU508D ST (SGS-THOMSON) BU508DW
BU508D TELEFUNKEN BU508DW
BU508DF SAMSUNG BU508DX
BU508DFI ST (SGS-THOMSON) BU508DX
BU508DR TELEFUNKEN BU508DW
BU508DXI ST (SGS-THOMSON) BU4508DZ
BU508F SAMSUNG BU508AX
BU508FI ST (SGS-THOMSON) BU508AX
BU705 TELEFUNKEN BU505
BU908 TELEFUNKEN BU4506AX
BUD600 VISHAY/ SILICONIX BUJ101
BUD620 VISHAY/ SILICONIX BUJ103
BUD630 VISHAY/ SILICONIX "BUJ103, BUJ105"
BUD636A VISHAY/ SILICONIX "BUJ202, BUJ303"
BUD86 VISHAY/ SILICONIX "BUJ101, BUJ202"
BUD87 VISHAY/ SILICONIX "BUJ202, BUJ301"
BUF405 ST (SGS-THOMSON) BUJ204A
BUF620 VISHAY/ SILICONIX BUJ103A
BUF630 VISHAY/ SILICONIX "BUJ103A, BUJ105A"
BUF636A VISHAY/ SILICONIX "BUJ202A, BUJ303A"
BUF640A VISHAY/ SILICONIX "BUJ204A, BUJ303A"
BUF642 VISHAY/ SILICONIX BUJ204A
BUF644 VISHAY/ SILICONIX BUJ105A
BUF646A VISHAY/ SILICONIX "BUJ204A, BUJ304A"
BUF650 VISHAY/ SILICONIX "BUJ105A, BUJ106A"
BUF654 VISHAY/ SILICONIX BUJ106A
BUF742 VISHAY/ SILICONIX BUJ303A
BUF744 VISHAY/ SILICONIX BUJ105A
BUH100 MOTOROLA "BUJ105A, BUJ106A"
BUH1015 ST (SGS-THOMSON) BU4540AW
BUH1015HI ST (SGS-THOMSON) BU4540AL
BUH1215 ST (SGS-THOMSON) BU4540AW
BUH150 MOTOROLA BUJ106A
BUH315 ST (SGS-THOMSON) BU4506AX
BUH315D ST (SGS-THOMSON) BU4506DX
BUH315DXI ST (SGS-THOMSON) BU4506DZ
BUH315XI ST (SGS-THOMSON) BU4506AZ
BUH415DXI ST (SGS-THOMSON) BU4507DZ
BUH417 ST (SGS-THOMSON) BU2708AX
BUH50 MOTOROLA BUJ303A
BUH515 ST (SGS-THOMSON) BU4508AX
BUH515D ST (SGS-THOMSON) BU4508DX
BUH515DX1 ST (SGS-THOMSON) BU4508DZ
BUH515FP ST (SGS-THOMSON) BU4508DZ
BUH515XI ST (SGS-THOMSON) BU4508AZ
BUH517 ST (SGS-THOMSON) BU2720AX
BUH517D ST (SGS-THOMSON) BU2720DX
BUH615 ST (SGS-THOMSON) BU4522AX
BUH615D ST (SGS-THOMSON) BU4522DX
BUH715 ST (SGS-THOMSON) BU4523AX
BUL128 ST (SGS-THOMSON) BUJ103A
BUL128FP ST (SGS-THOMSON) BUJ103AX
BUL138 ST (SGS-THOMSON) "BUJ103A, BUJ202A"
BUL138FP ST (SGS-THOMSON) "BUJ103AX, BUJ202AX"
BUL146 MOTOROLA BUJ105A
BUL146F MOTOROLA BUJ105AX
BUL147 MOTOROLA BUJ105A
BUL147F MOTOROLA BUJ105AX
BUL216 ST (SGS-THOMSON) BU1706A
BUL26 ST (SGS-THOMSON) BUJ103A
BUL310 ST (SGS-THOMSON) BUJ303A
BUL310PI ST (SGS-THOMSON) BUJ303AX
BUL381 ST (SGS-THOMSON) "BUJ103A, BUJ202A"
BUL382 ST (SGS-THOMSON) "BUJ103A, BUJ202A"
BUL410 ST (SGS-THOMSON) "BUJ204A, BUJ304A"
BUL416 ST (SGS-THOMSON) BU1706A
BUL44 MOTOROLA BUJ101A
BUL44F MOTOROLA BUJ101AX
BUL45 MOTOROLA BUJ103A
BUL45F MOTOROLA BUJ103AX
BUL48 ST (SGS-THOMSON) "BUJ105A, BUJ204A"
BUL510 ST (SGS-THOMSON) BUJ304A
BUL57 ST (SGS-THOMSON) BUJ105A
BUL57PI ST (SGS-THOMSON) BUJ105AX
BUL59 ST (SGS-THOMSON) BUJ204A
BUL67 ST (SGS-THOMSON) BUJ106A
BUL810 ST (SGS-THOMSON) BUJ305A
BUL87 ST (SGS-THOMSON) BUJ106A
BULK26 ST (SGS-THOMSON) BUJ103
BULK381 ST (SGS-THOMSON) "BUJ103, BUJ202"
BULK382 ST (SGS-THOMSON) "BUJ103, BUJ202"
BULT118 ST (SGS-THOMSON) BUJ101
BUT11A PHILIPS "BUT11AI, BUJ202A, BUJ303A"
BUT11AF PHILIPS "BUT11XI, BUJ202AX, BUJ303AX"
BUT11AX PHILIPS "BUT11XI, BUJ202AX, BUJ303AX"
BUT12A PHILIPS "BUJ204A, BUJ304A"
BUT12AF PHILIPS "BUJ204AX, BUJ304AX"
BUT12AX PHILIPS "BUJ204AX, BUJ304AX"
BUT18A PHILIPS "BUJ204A, BUJ303A, BUJ304A"
BUT18AF PHILIPS "BUJ204AX, BUJ303AX, BUJ304AX"
BUT18AX PHILIPS "BUJ204AX, BUJ303AX, BUJ304AX"
BUT211 PHILIPS "BUJ103A, BUJ204A"
BUT211X PHILIPS "BUJ103AX, BUJ204AX"
BUW14 PHILIPS "BUJ202, BUJ301"
BUW84 PHILIPS "BUJ101, BUJ202"
BUW85 PHILIPS "BUJ202, BUJ301"
BUX84 PHILIPS "BUJ101A, BUJ202A"
BUX84F PHILIPS "BUJ101AX, BUJ202AX"
BUX85 PHILIPS "BUJ202A, BUJ301A"
BUX85F PHILIPS "BUJ202AX, BUJ301AX"
BUX86P PHILIPS "BUJ101, BUJ202"
BUX87P PHILIPS "BUJ202, BUJ301"
KSC2333 SAMSUNG BUJ101A
KSC2335 SAMSUNG BUJ105A
KSC2335F SAMSUNG BUJ105AX
KSC2518 SAMSUNG BUJ103A
KSC2752 SAMSUNG BUJ101
KSC5020 SAMSUNG BUJ301A
KSC5021 SAMSUNG BUJ303A
KSC5021F SAMSUNG BUJ303AX
KSC5027 SAMSUNG BU1706A
KSC5027F SAMSUNG BU1706AX
KSC5029 SAMSUNG BU1706A
KSC5030 SAMSUNG BU1706A
KSC5030F SAMSUNG BU1706AX
KSC5039 SAMSUNG BUJ103A
KSC5039F SAMSUNG BUJ103AX
KSC5321 SAMSUNG BUJ303A
KSC5321F SAMSUNG BUJ303AX
KSC5338 SAMSUNG "BUJ202A, BUJ204A"
KSC5338F SAMSUNG "BUJ202AX, BUJ204AX"
KSD5060 SAMSUNG BU505D
KSD5061 SAMSUNG BU4505DX
KSD5062 SAMSUNG BU4507DX
KSD5064 SAMSUNG BU505
KSD5065 SAMSUNG BU4505AX
KSD5066 SAMSUNG BU4507AX
KSD5070 SAMSUNG BU4504DX
KSD5071 SAMSUNG BU4505DX
KSD5072 SAMSUNG BU4507DX
KSD5074 SAMSUNG BU4504AX
KSD5075 SAMSUNG BU4505AX
KSD5076 SAMSUNG BU4507AX
KSD5078 SAMSUNG BU4522AX
KSD5080 SAMSUNG BU4522DX
KSD5086 SAMSUNG BU4508DX
KSD5088 SAMSUNG BU4522AX
KSD5089 SAMSUNG BU2520AW
KSD5090 SAMSUNG BU2520DW
KSE13004 SAMSUNG BUJ103A
KSE13005 SAMSUNG "PHE13005, BUJ103A"
KSE13005F SAMSUNG BUJ103AX
KSE13006 SAMSUNG BUJ105A
KSE13007 SAMSUNG BUJ105A
KSE13007F SAMSUNG BUJ105AX
KSE13008 SAMSUNG BUJ106A
KSE13009 SAMSUNG BUJ106A
KSE13009F SAMSUNG BUJ106AX
MJD13003 MOTOROLA BUJ101
MJE13003 MOTOROLA BUJ101
MJE13005 MOTOROLA "PHE13005, BUJ103A"
MJE13007 MOTOROLA BUJ105A
MJE13009 MOTOROLA BUJ106A
MJE16004 MOTOROLA "BUJ202A, BUJ204A"
MJE16106 MOTOROLA BUJ105A
MJE18002 MOTOROLA "BUJ202A, BUJ301A"
MJE18004 MOTOROLA "BUJ202A, BUJ303A"
MJE18006 MOTOROLA "BUJ204A, BUJ303A"
MJE18008 MOTOROLA "BUJ205A, BUJ304A"
MJE18009 MOTOROLA "BUJ205A, BUJ304A"
MJE18204 MOTOROLA BUJ403A
MJE18206 MOTOROLA BUJ403A
MJF13007 MOTOROLA BUJ105AX
MJF13009 MOTOROLA BUJ106AX
MJF16212 MOTOROLA BU4525AF
MJF18002 MOTOROLA "BUJ202AX, BUJ301AX"
MJF18004 MOTOROLA "BUJ202AX, BUJ303AX"
MJF18006 MOTOROLA "BUJ202AX, BUJ303AX"
MJF18008 MOTOROLA "BUJ205AX, BUJ304AX"
MJF18009 MOTOROLA "BUJ205AX, BUJ304AX"
MJF18204 MOTOROLA BUJ403AX
MJF18206 MOTOROLA BUJ403AX
MJH16212 MOTOROLA BU4525AW
MJW16212 MOTOROLA BU4525AW
S2000 TOSHIBA BU4508AX
S2000A TOSHIBA BU4508AX
S2000AF TOSHIBA BU4508AX
S2000AFI ST (SGS-THOMSON) BU4508AX
S2000AXI ST (SGS-THOMSON) BU4508AZ
S2000F TOSHIBA BU4508AX
S2055 TOSHIBA BU2508DW
S2055A TOSHIBA BU2508DW
S2055AF TOSHIBA BU4508DX
S2055F TOSHIBA BU4508DX
S2818 TOSHIBA BU2508DW
S2818A TOSHIBA BU2508DW
SGSF323 ST (SGS-THOMSON) "BUJ202A, BUJ303A"
SGSF343 ST (SGS-THOMSON) "BUJ204A, BUJ304A"
ST13003 ST (SGS-THOMSON) BUJ101
ST13005 ST (SGS-THOMSON) "PHE13005, BUJ103A"
ST13007 ST (SGS-THOMSON) BUJ105A
ST1802HI ST (SGS-THOMSON) BU4507AX
ST1803DHI ST (SGS-THOMSON) BU4507DX
ST2001HI ST (SGS-THOMSON) BU4515AX
T2V80HFX SHINDENGEN BU1706A
T3V40F3 SHINDENGEN BUJ103A
T3V45FX SHINDENGEN BUJ202A
T3V80HFX SHINDENGEN BU1706A
T5V45FX SHINDENGEN BUJ204A
T6V40F3 SHINDENGEN BUJ105A
T6V80HDT SHINDENGEN BU1706A
T8V45FX SHINDENGEN BUJ205A
td13002 VISHAY/ SILICONIX BUJ101
td13003 VISHAY/ SILICONIX BUJ101
td13004 VISHAY/ SILICONIX BUJ103
td13005 VISHAY/ SILICONIX BUJ103
TE13004 VISHAY/ SILICONIX "PHE13005, BUJ103A"
TE13005 VISHAY/ SILICONIX "PHE13005, BUJ103A"
TE13008 VISHAY/ SILICONIX BUJ106A
TE13009 VISHAY/ SILICONIX BUJ106A
THD200FI ST (SGS-THOMSON) BU4525AX
THD215HI ST (SGS-THOMSON) BU4522AX
THD218DHI ST (SGS-THOMSON) BU4507DX
THD277HI ST (SGS-THOMSON) BU4507AX
THD300 ST (SGS-THOMSON) BU4540AW
TP2V80HFX SHINDENGEN BU1706AX
TP3V45FX SHINDENGEN BUJ202AX
TP3V80HFX SHINDENGEN BU1706AX
TP5V45FX SHINDENGEN BUJ204AX
TP6V80HDT SHINDENGEN BU1706AX
TP8V45FX SHINDENGEN BUJ205AX 
 
 
 

What if I can't find the original transistor details?


Sometimes it is very easy to find out the parameters of a particular transistor as it may be possible to find them on the Internet or in a transistor data book. If this is not possible, either because the markings are not visible, or the data cannot be found, then not all is lost. It is still possible to find out a lot about the transistor from its package and also the circuit in which it is being used. In this way it is usually possible to find a suitable replacement transistor. The step by step instructions below should help the essential parameters of the transistor to be discovered.

Step by step instructions:

These instructions are set out in an approximate order of the most significant parameters first followed by the less significant ones:
  1. Is it a transistor?   This may appear to be an obvious question, but occasionally some devices may appear to be a transistor at first sight. It may be a field effect transistor, a Darlington transistor or even some other form of device. Alternatively, sometimes small voltage regulators are contained in packages similar to that of a transistor. Other devices may also appear in what may appear to be transistor packages at first sight. Careful examination of the application will enable this to be verified.
  2. Silicon or germanium:   It is important to find out whether the transistor is silicon or germanium. It may be possible to discover this in a number of ways. If the original transistor is still working then this can be discovered by measuring the voltage across the base emitter junction when it is forward biased. This should be about 0.2 to 0.3 volts for a germanium transistor and 0.6 volts for other varieties. Alternatively it may be possible to ascertain the type by looking at other transistors in the circuit. Often the same technology will be used throughout the equipment. This is not always true so beware!
  3. Power dissipation:   This is often defined by the package in which the transistor is placed. Look at the specifications for other transistors in the same packages and this will give a good guide. Those packages designed for mounting on heatsinks will be more variable because they can often dissipate more power dependent upon the heatsink. It is best to be more cautious with these packages.
  4. Maximum voltage:   An idea of the maximum voltage can be gained from the circuit in which it is used. To be on the safe side, ensure the maximum operating voltage of the replacement transistor is at least twice the rail voltage of the circuit in which it is operating
  5. Current gain:   The current gain of transistors is notoriously difficult to specify. High power transistors often offer lower gains - older power transistor types may be as low as 20 - 50, whereas the smaller transistors may offer gains anywhere between 50 and 1000.
  6. Maximum frequency:   It is necessary to make sure that the replacement transistor is able to operate at the required frequency. Look at the components in the circuit and the function of the circuit. It is usually possible to estimate the frequency of operation. Then take this and choose a replacement transistor that can easily operate at this frequency.
  7. Anything else:   Although most of the main points have been covered in the points above, it is always best to be on the look out for other parameters that may affect the choice of transistor replacement. This is particularly true for specialised circuits where some specific performance features may be critical.

Summary


Choosing a replacement transistor is normally quite easy. There is a huge number of transistor types available, and the specifications of many types of transistor overlap, making the choice of a replacement transistor quite easy in many instances.

Being able to choosing a replacement transistor can be very useful if the exact transistor type is not available easily. It is quite likely that a similar one may be available to hand, or possibly from a local stockist. In either case, it is useful to be able to choose the replacement transistor with a good possibility of it being able to work.




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