Need transistor with BD139 specs but higher wattage?

[Dr. Popo]

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]

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]

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

 

[Iain McNeill]

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

 

[jcx]

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]

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

 

[454Casull]

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]

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

 

[Enzo]

"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]

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

 

[jacco vermeulen]

It will be difficult to find a much higher power in a TO126 case.

Euhhh, Hitachi 2SD669, 20W in the same TO126 deal as the BD139.

(for five bucks or the cell phone number of a sleazy waitress i'll crunch out a couple more)