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Old 12th March 2005, 04:23 PM   #1
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Default 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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Old 12th March 2005, 04:59 PM   #2
sajti is offline sajti  Hungary
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Default Re: European Transistors Equivalent Search

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
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Old 12th March 2005, 05:14 PM   #3
moamps is offline moamps  Croatia
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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
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Old 12th March 2005, 07:29 PM   #4
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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.
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Old 12th March 2005, 08:32 PM   #5
moamps is offline moamps  Croatia
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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
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Old 15th March 2005, 06:39 AM   #6
ilimzn is offline ilimzn  Croatia
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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.
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Old 15th March 2005, 09:18 AM   #7
jaycee is offline jaycee  United Kingdom
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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)
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Old 27th September 2010, 12:07 PM   #8
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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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