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General unknown component question

MScMech

Aug 4, 2009
4
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Aug 4, 2009
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Hi! :confused:

For an example, I have some transistors from and old phone. Two of them are marked:

C945 G-811
C819 S9015

respectively. I immediately found a data sheet for C945 but nothing about G-811. The one I found seems to be called C945 TO-92, if I understand correctly. Can I assume they are similar? What these are is really not that important right now, but an example of my troubles getting into the world of electronics.

I have this same experience from previous attempts at identifing electronic components. So I guess my question is if there is a standard for component marking. Or, in practical terms: How do I find a data sheet for any given component marking, and if I find something close, can I tell if I can use it instead?

I'd be happy if someone could sort this out or point me to a source of knowledge that can.

Ciao!

Mech
 

Resqueline

Jul 31, 2009
2,848
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Jul 31, 2009
Messages
2,848
Tjänare grabben!
These sounds like japanese transistors.
You can then just put 2S in front of the markings, so you get 2SC945 & 2SC819.
The other markings are just factory & date codes. The latter is made in week 15 in 1990.
Sometimes even the european BC-series are marked in short-hand (C549=BC549).
You just have to use deduction & recognition to tell the difference.
 

JSL

Aug 28, 2009
2
Joined
Aug 28, 2009
Messages
2
In addition, TO-92 is the type of case ie, little round black plastic things with a flat edge and 3 pins poking out.
 
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