Looking for transistors

willy · 17th April 2003, 02:47 PM

I am looking for some of those big plastic case transistors that are completely encased in plastic so as not to have to use insulator gaskets. I need them for the output stage of a power amp. (bipolar) Does anyone know the numbers of any of this type of transistor? What is the case type? Thanks so much for your help.

MikeW · 17th April 2003, 03:15 PM

The parts you are looking for are to-264 packages. They still need an insulator between the transistor and the heatsink. On Semi has the MLJ21193,21194 and the MJL3281,1302. Look at Digikey, Future, and Mouser for prices.

rMa · 17th April 2003, 03:21 PM

Hi willy,

I'm not sure what you mean by big but one type used by ST is TO-220FP. BD241BFP and BD242BFP are one example of their isolated type complementary pair.

I think ISOWATT220 is also commonly used name for this package.

- rMa -

Apex Jr · 17th April 2003, 05:06 PM

Willy....
I have a large stock of Motorola MJ 10051
BiPolar Transistors. They are 850Volts 50Amps
They roughly are about 2" Square and are NPN
The case is a 346-01
Price...... $3.95ea

Steve @ Apex Jr

blmn · 20th April 2003, 05:33 PM

willy

Actually you will find some devices in ISOWATT style (fully isolated devices).

I made, sometime ago, an amp using the NPN/PNP pair TIP33/34CF, where the F means fully isolated, made by CDIL. They might have other fully isolated power devices available.

But you have to be aware of the power dissipation questions when using this type of packages in high power applications.

Except if you have some special application or problem wich make the insulators use not possible, I think you must consider the traditional non-isolated device plus insulator mounting.

regards,

17th April 2003, 02:47 PM	#1
willy diyAudio Member Join Date: Oct 2002 Location: usa	Looking for transistors I am looking for some of those big plastic case transistors that are completely encased in plastic so as not to have to use insulator gaskets. I need them for the output stage of a power amp. (bipolar) Does anyone know the numbers of any of this type of transistor? What is the case type? Thanks so much for your help. __________________ Where there is smoke....there is fire. (usually one of my circuits)

17th April 2003, 03:15 PM	#2
MikeW diyAudio Member Join Date: Sep 2002 Location: North of Boston	The parts you are looking for are to-264 packages. They still need an insulator between the transistor and the heatsink. On Semi has the MLJ21193,21194 and the MJL3281,1302. Look at Digikey, Future, and Mouser for prices. __________________ MikeW

17th April 2003, 05:06 PM	#4
Apex Jr diyAudio Member Join Date: Jun 2002 Location: Torrance, Calif	MJ 10051 Willy.... I have a large stock of Motorola MJ 10051 BiPolar Transistors. They are 850Volts 50Amps They roughly are about 2" Square and are NPN The case is a 346-01 Price...... $3.95ea Steve @ Apex Jr

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17th April 2003, 03:21 PM	#3
rMa diyAudio Member Join Date: Apr 2003 Location: Rauma, Finland	Hi willy, I'm not sure what you mean by big but one type used by ST is TO-220FP. BD241BFP and BD242BFP are one example of their isolated type complementary pair. I think ISOWATT220 is also commonly used name for this package. - rMa -

20th April 2003, 05:33 PM	#5
blmn diyAudio Member Join Date: Feb 2001 Location: .	willy Actually you will find some devices in ISOWATT style (fully isolated devices). I made, sometime ago, an amp using the NPN/PNP pair TIP33/34CF, where the F means fully isolated, made by CDIL. They might have other fully isolated power devices available. But you have to be aware of the power dissipation questions when using this type of packages in high power applications. Except if you have some special application or problem wich make the insulators use not possible, I think you must consider the traditional non-isolated device plus insulator mounting. regards,

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