Need transistor with BD139 specs but higher wattage?

Dr. Popo · 20th October 2009, 11:01 PM

Hello,

I am looking for BD139 substitute with same basic specs except I need much higher wattage (power). Can anybody make any suggestions? Thanks!

Iain McNeill · 20th October 2009, 11:26 PM

Bit more info please unless a 2N3055 will do.

You need the same pin out and package size?
What supply voltage are you using?
How much current at what supply voltage do you need to deliver?

If you can tell us the application that would help too.

Enzo · 21st October 2009, 03:36 AM

So you are going to make us have to look up the BD139 to find out what those specs are?

Iain McNeill · 21st October 2009, 03:43 AM

http://www.fairchildsemi.com/ds/BD/BD139.pdf

jcx · 21st October 2009, 04:52 AM

the obvious solution is parallel more BDs with a little emitter degen for good current sharing

"totem pole" cascading can also work if low Vsat isn't required

peranders · 21st October 2009, 04:55 AM

D44H11 is good if you can take different pinning, normal TO220. What is your application?

454Casull · 21st October 2009, 05:12 AM

Quote:

Originally Posted by Enzo

So you are going to make us have to look up the BD139 to find out what those specs are?

Ordinarily I would share the sentiment but if you don't know the properties of the BD139 then you can hardly recommend a better alternative, eh?

Elvee · 21st October 2009, 09:28 AM

The BDX37 is pretty similar, but has half the thermal resistance of a BD139:
http://www.datasheetcatalog.org/data...lips/BDX36.pdf
It will be difficult to find a much a higher power in a TO126 case.

Enzo · 22nd October 2009, 04:49 AM

"Ordinarily I would share the sentiment but if you don't know the properties of the BD139 then you can hardly recommend a better alternative, eh? "

Well, I don;t know. He isn;t looking for a drop in exact replacement, he is looking for something similar with larger dissipation rating. I am not so sure that not having the characteristics of the particular part in my head disqualifies me from doing here what I have to do on a regular basis on my bench - come up with a reasonable substitute for a part.

if it is a secret, then I guess I will never learn those properties, and will never be able to offer a useful insight. My work is largely in pro audio, and we don't see so many transistors from the BD series, we mainly see American numbers and Asian numbers. But I think consumer audio works in similar fashion.

Thanks.

anthony.taylor1967 · 22nd October 2009, 05:28 PM

Hi, can you tell me what you are using it in or what it is for, nobody has asked you this. I used to use these in my diy amplifiers back in the 80's, but if my memory serves me correct i used a BD711 or BD712 but I had to turn it round as I think the Base and Emmiter is opposite to the BD139.But there are other factors eg - is it mounted on a heatsink.

I hope this helps - Let me know

Anthony

20th October 2009, 11:01 PM	#1
Dr. Popo diyAudio Member Join Date: Apr 2009	Need transistor with BD139 specs but higher wattage? Hello, I am looking for BD139 substitute with same basic specs except I need much higher wattage (power). Can anybody make any suggestions? Thanks!

21st October 2009, 04:55 AM	#6
peranders Electrons are yellow diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 3	D44H11 is good if you can take different pinning, normal TO220. What is your application? __________________ /Per-Anders (my first name) or P-A as my friends call me BPA300 Group Buy Round 4, SMD-kit and DRV134 pcb. Not too late to sign up. Sign up HERE

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20th October 2009, 11:26 PM	#2
Iain McNeill diyAudio Moderator Join Date: Oct 2007 Location: Santa Cruz, California	Bit more info please unless a 2N3055 will do. You need the same pin out and package size? What supply voltage are you using? How much current at what supply voltage do you need to deliver? If you can tell us the application that would help too.

21st October 2009, 03:36 AM	#3
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	So you are going to make us have to look up the BD139 to find out what those specs are?

21st October 2009, 03:43 AM	#4
Iain McNeill diyAudio Moderator Join Date: Oct 2007 Location: Santa Cruz, California	http://www.fairchildsemi.com/ds/BD/BD139.pdf

21st October 2009, 04:52 AM	#5
jcx diyAudio Member Join Date: Feb 2003 Location: ..	the obvious solution is parallel more BDs with a little emitter degen for good current sharing "totem pole" cascading can also work if low Vsat isn't required

21st October 2009, 09:28 AM	#8
Elvee diyAudio Member Join Date: Sep 2006	The BDX37 is pretty similar, but has half the thermal resistance of a BD139: http://www.datasheetcatalog.org/data...lips/BDX36.pdf It will be difficult to find a much a higher power in a TO126 case.

22nd October 2009, 04:49 AM	#9
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	"Ordinarily I would share the sentiment but if you don't know the properties of the BD139 then you can hardly recommend a better alternative, eh? " Well, I don;t know. He isn;t looking for a drop in exact replacement, he is looking for something similar with larger dissipation rating. I am not so sure that not having the characteristics of the particular part in my head disqualifies me from doing here what I have to do on a regular basis on my bench - come up with a reasonable substitute for a part. if it is a secret, then I guess I will never learn those properties, and will never be able to offer a useful insight. My work is largely in pro audio, and we don't see so many transistors from the BD series, we mainly see American numbers and Asian numbers. But I think consumer audio works in similar fashion. Thanks.

22nd October 2009, 05:28 PM	#10
anthony.taylor1967 diyAudio Member Join Date: Oct 2009 Location: Manchester	Hi, can you tell me what you are using it in or what it is for, nobody has asked you this. I used to use these in my diy amplifiers back in the 80's, but if my memory serves me correct i used a BD711 or BD712 but I had to turn it round as I think the Base and Emmiter is opposite to the BD139.But there are other factors eg - is it mounted on a heatsink. I hope this helps - Let me know Anthony

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