European Transistors Equivalent Search

Algar_emi · 12th March 2005, 04:23 PM

Hi. Ièm looking for the american (digikey) part number equivalent of the following european transistors:

BC546B
BC556B
BC639
BF256A

Can someone help me on that?

Thanks...

sajti · 12th March 2005, 04:59 PM

Quote:

Originally posted by Algar_emi
Hi. Ièm looking for the american (digikey) part number equivalent of the following european transistors:

BC546B
BC556B
BC639
BF256A

Can someone help me on that?

Thanks...

I'm sure, that Onsemi makes the 546/556, and the 639....

sajti

moamps · 12th March 2005, 05:14 PM

Hi,
I usually use these substitutions:

BC546/556 --- MPSA06/56 or 2N5401/5551
BC639/640 --- MPSA43/93 or 42/92
BF256 --- jfet ----depends on the application

Regards,
Milan

Algar_emi · 12th March 2005, 07:29 PM

Great help, very appreciated.
Here the application for the FET. It is an amp protection circuit.
I think it is use in this circuit as a current source for T35,T36.

So what is your recommendation on this?

Thanks.

moamps · 12th March 2005, 08:32 PM

Quote:

Originally posted by Algar_emi
I think it is use in this circuit as a current source for T35,T36.

Hi,

The closest replacement (RF characteristic) for BF256 in digikey catalog is 2N5486. However, in this application almost any N ch jfet with Idss around 5mA will be just fine, IMO.

It is Elektor's THE AMP?

Regards,
Milan

ilimzn · 15th March 2005, 06:39 AM

The transistors used really do not seem critical at all in this circuit.
Perhaps the easyest thing would be to use MPS8099 and MPS8599. Just be careful when replacing the BC639 as the pinout is different.

jaycee · 15th March 2005, 09:18 AM

You could replace the FET arrangement with any current sink, as this is all it is doing. You could make a current sink with 2 transistors or 1 transistor and a 3mm LED quite easily (look at the LTP of pretty much any amplifier to see how this works)

princenzekwue · 27th September 2010, 12:07 PM

Please can any body on how to get MPSA06 TRANSISTOR and TIP42S for my Hydrotrac echo sounder panel. Cant find any around Nigeria.

Thanks

12th March 2005, 04:23 PM	#1
Algar_emi diyAudio Member Join Date: Oct 2002 Location: Canada, Qc	European Transistors Equivalent Search Hi. Ièm looking for the american (digikey) part number equivalent of the following european transistors: BC546B BC556B BC639 BF256A Can someone help me on that? Thanks...

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12th March 2005, 05:14 PM	#3
moamps diyAudio Member Join Date: Oct 2002 Location: Croatia	Hi, I usually use these substitutions: BC546/556 --- MPSA06/56 or 2N5401/5551 BC639/640 --- MPSA43/93 or 42/92 BF256 --- jfet ----depends on the application Regards, Milan

15th March 2005, 06:39 AM	#6
ilimzn diyAudio Member Join Date: Feb 2005 Location: Zagreb	The transistors used really do not seem critical at all in this circuit. Perhaps the easyest thing would be to use MPS8099 and MPS8599. Just be careful when replacing the BC639 as the pinout is different.

15th March 2005, 09:18 AM	#7
jaycee diyAudio Member Join Date: Apr 2004 Location: Norwich, UK	You could replace the FET arrangement with any current sink, as this is all it is doing. You could make a current sink with 2 transistors or 1 transistor and a 3mm LED quite easily (look at the LTP of pretty much any amplifier to see how this works)

27th September 2010, 12:07 PM	#8
princenzekwue diyAudio Member Join Date: Sep 2010 Location: Port Harcourt, Nigeria, West Africa.	Please can any body on how to get MPSA06 TRANSISTOR and TIP42S for my Hydrotrac echo sounder panel. Cant find any around Nigeria. Thanks

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