bc546, 556, bd139 sources/replacement help

Mattyo5 · 5th March 2003, 01:36 AM

I am building Anthony Holton's 400 watt symmetrical amp and it calls for bc546 556 and bd139 (I guess these are the small transistors). Digikey doesn't have them. Does digikey have anything that would be a drop in replacement? I found some stuff at Mouser, but I'm not sure its its correct, bc546B bc556, and BD139 ships in 14 days. I'd rather use digikey. Any ideas?

-Matthew K. Olson

ashok · 5th March 2003, 02:07 AM

" I found some stuff at Mouser, but I'm not sure its its correct, bc546B bc556, and BD139 "

If what you have found is what you typed above , it seems right. All those transistors are widely used. BC series have an A or a B or a C depending on the current gain. No letter is the least gain. In most cases any type would do except when high gain is a must by design.
BD139 is a higher power device (than BC5xx series) in a TO126 case I think.
You can go ahead and buy these from Mouser. I do not think you can go wrong.
Cheers.

Mattyo5 · 5th March 2003, 02:10 AM

Ok, well, I was trying to stick w/ digikey. Oh well. I'll grab em from mouser I guess. Anyone know of direct replacements from digikey? Thanks!

-Matthew K. Olson

dwjj · 6th March 2003, 05:38 PM

You might read this thread
replacements
digikey has 2sc4793/2sa1837 for bd139/140 and 2n3904/3906 might work for bc546/556. mpsa06/56 for bc546/556 has also been used. There are lots of threads with other options.

I don't think digikey has the following (just for more options). I also use partsexpress.com matelectronics.com and i-mcm.com to get transistors.

ESP http://www.sound.westhost.com/ uses MJE340/350 to replace BD139/140.

I've also gotten MPS8099/MPS8599 and MPS8098/MPS8598 from ebay that seem to work in place of BC546/556

Mattyo5 · 6th March 2003, 09:04 PM

Thanks. I got the extra stuff from Newark instead. Don't know why. Just did. I tried partsexpress (who is my favorite actually) but they only seemed to ahve the MJE340/350's...so I got those from them. Newark was fine too though.

Thanks for posting though, now i have a reference in case I need it.

-Matthew K. Olson

5th March 2003, 01:36 AM	#1
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	bc546, 556, bd139 sources/replacement help I am building Anthony Holton's 400 watt symmetrical amp and it calls for bc546 556 and bd139 (I guess these are the small transistors). Digikey doesn't have them. Does digikey have anything that would be a drop in replacement? I found some stuff at Mouser, but I'm not sure its its correct, bc546B bc556, and BD139 ships in 14 days. I'd rather use digikey. Any ideas? -Matthew K. Olson

5th March 2003, 02:07 AM	#2
ashok diyAudio Member Join Date: Jun 2002 Location: 3RS	Transistors. " I found some stuff at Mouser, but I'm not sure its its correct, bc546B bc556, and BD139 " If what you have found is what you typed above , it seems right. All those transistors are widely used. BC series have an A or a B or a C depending on the current gain. No letter is the least gain. In most cases any type would do except when high gain is a must by design. BD139 is a higher power device (than BC5xx series) in a TO126 case I think. You can go ahead and buy these from Mouser. I do not think you can go wrong. Cheers. __________________ AM

6th March 2003, 05:38 PM	#4
dwjj diyAudio Member Join Date: May 2002 Location: Round Rock, TX	You might read this thread replacements digikey has 2sc4793/2sa1837 for bd139/140 and 2n3904/3906 might work for bc546/556. mpsa06/56 for bc546/556 has also been used. There are lots of threads with other options. I don't think digikey has the following (just for more options). I also use partsexpress.com matelectronics.com and i-mcm.com to get transistors. ESP http://www.sound.westhost.com/ uses MJE340/350 to replace BD139/140. I've also gotten MPS8099/MPS8599 and MPS8098/MPS8598 from ebay that seem to work in place of BC546/556 __________________ It's cheaper than a movie, and there's free coffee.

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5th March 2003, 02:10 AM	#3
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	Ok, well, I was trying to stick w/ digikey. Oh well. I'll grab em from mouser I guess. Anyone know of direct replacements from digikey? Thanks! -Matthew K. Olson

6th March 2003, 09:04 PM	#5
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	Thanks. I got the extra stuff from Newark instead. Don't know why. Just did. I tried partsexpress (who is my favorite actually) but they only seemed to ahve the MJE340/350's...so I got those from them. Newark was fine too though. Thanks for posting though, now i have a reference in case I need it. -Matthew K. Olson

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