European Transistors Equivalent Search

[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...

 

[sajti]

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]

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]

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]

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]

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]

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]

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

Thanks