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 V_CEO and V_CBO 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 I_Cmax 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.