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General unknown component question

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Discussion in 'Datasheets, Manuals and Component Identification' started by MScMech, Aug 4, 2009.

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  1. Aug 4, 2009 #1
    MScMech

    MScMech

    4
    0
    Aug 4, 2009
    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
     
  2. Aug 8, 2009 #2
    Resqueline

    Resqueline

    2,848
    2
    Jul 31, 2009
    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.
     
  3. Aug 16, 2009 #3
    MScMech

    MScMech

    4
    0
    Aug 4, 2009
    Tackar!
    At least that made me a little bit wiser!
     
  4. Aug 28, 2009 #4
    JSL

    JSL

    2
    0
    Aug 28, 2009
    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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