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'[OT] ID of Transistor'
1999\03\16@054903 by Quentin

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Sorry for the OT, please reply privately.

Can anybody please tell me if a C640 transistor is the same as a BC640?
I get different results from my suppliers and Data books. Web search
only bring up the BC640.
We can not source this part. Full number on part:
C640-16
PH33

Thanks
Quentin

1999\03\16@170609 by Chris Eddy

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Quentin;

There is a very high likelihood that it is a 2SC640.  Definitely of the
asian type, where A and B are PNP, C and D are NPN, and the formers are
high in frequency and the latters are lower in frequencies (may have that
reversed).  The SK cross book lists it as SK4939, an NPN VHF RF amp with
150mW, 20mA Ic, Vceo of 30V, beta of 60-200, Ft of 530MHz. Gain of 23 dB at
200MHz.  It looks like a front end device.  If the part you have was
turning a relay on and off, you have the wrong cross.  If you found it in
your cable descrambler, you probably have the right man.

Chris Eddy PE
Pioneer Microsystems, Inc.

Quentin wrote:

{Quote hidden}

1999\03\17@015256 by Nigel Goodwin

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In message <spam_OUT36EE36D5.AA380D89TakeThisOuTspamicon.co.za>, Quentin <.....qscKILLspamspam@spam@ICON.CO.ZA>
writes
>Sorry for the OT, please reply privately.
>
>Can anybody please tell me if a C640 transistor is the same as a BC640?
>I get different results from my suppliers and Data books. Web search
>only bring up the BC640.

These short numbers are usually found on Japanese transistors, full
number is most likely 2SC640.
--

Nigel.

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1999\03\17@024151 by Jochen Feldhaar

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Hello all,

AFAIK, this is a Japanese model, called 2SC640...

Greetings Jochen

1999\03\17@030046 by Quentin

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Thanks to all that replied.
It is not a 2SC640. As Chris indicated, the 2SC640 is better use for
amps. The C640 I am using is used as a driver for a pnuematic solinoid.
It is actually on an output board of a PLC.
I will try the BC640.
(It can only blow up, right? hehe)

Quentin

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