Newbie question: Identifying Transistors

[James Howe]

I recently purchased a 'grab bag' of components which included a bunch
of transistors. Most of the transistors are what I think of as a
typical transistor, black case, flat on one side. Many of these
transistors have no markings on them at all. Others say things like
"NTCMP S3706" or "NTC P N4916". Is there a reasonable way to learn
more information about the specifications for these transistors?

Thanks.

James Howe
http://public.xdi.org/=James.Howe

 

[Gareth]

James Howe wrote:

I recently purchased a 'grab bag' of components which included a bunch
of transistors. Most of the transistors are what I think of as a
typical transistor, black case, flat on one side. Many of these
transistors have no markings on them at all. Others say things like
"NTCMP S3706" or "NTC P N4916".

The first thing I would try is typing the numbers on the marked devices
into Google. If that doesn't work try truncating the part number as the
last few characters could just be a batch code, date code of package
options. If you recognise the manufacturer you could go to their
website and see if you can find the part there.

Here are the websites of some transistor manufacturers:

http://www.onsemi.com

http://www.fairchildsemi.com/

http://www.zetex.com/

http://www.infineon.com


For the unmarked devices it could be very difficult. There are many
electronic devices which have three legs so these parts may not even be
transistors.

Good luck.

Gareth.

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