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Old 31st December 2002, 10:19 AM   #1
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Default how to determine the pin layout of NPN or PnP?

by using multimeter?..
example SGD and BCE.thanks for advice..
why different manufacturer have different pin layout..this is so confusing.. i have brought some transistor but dont know which manufacture.

rgds
tone
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Old 31st December 2002, 10:34 AM   #2
Cobra2 is offline Cobra2  Norway
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Default one of my favorite tools...

-is this: Peak Atlas

http://www.peakelec.co.uk/atlas.htm


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Old 31st December 2002, 11:33 AM   #3
OliverD is offline OliverD  Germany
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Easy if your multimeter has a diode tester. A BJT can bee seen as two diodes connected in series with either their cathodes (PNP) or anodes (NPN) tied together at the B (base) pin of your transistor.

Your multimeter will "see" a diode from base to collector and another one from base to emitter, if the polarity is correct.

That way you find out

a) if you have a working BJT

b) whether it is PNP or NPN

c) which of the three pins is B (base)

In case of a power transistor, the C (collector) pin is connected to case.

If you enter the type - as written on the case - into a search engine, you will often find a datasheet or some other site with pin layout and data. Or you can ask here in the forum.

There was a DIY component tester in Elektor magazine some time ago - looked like the one on the picture above. It would also give you hfe and Vbe.
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Old 31st December 2002, 01:15 PM   #4
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Default Re: how to determine the pin layout of NPN or PnP?

Quote:
Originally posted by tone
by using multimeter?..
example SGD and BCE.thanks for advice..
why different manufacturer have different pin layout..this is so confusing.. i have brought some transistor but dont know which manufacture.

rgds
tone
I think one easy way is to consult the expertise here or surf to www.questlink.com
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