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can some identify this transistor please

Discussion in 'Electronic Basics' started by dave, Sep 19, 2005.

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  1. dave

    dave Guest

    D140 G (or 6). There a ".T" marking on it too.
    I've done several searches but can find a datasheet (or pinout) for this
    transistor. I have a few of these in the junk box and they could come in usful
    if I knew what they were!
    thanks
     
  2. Tom Biasi

    Tom Biasi Guest

    Are there any manufacturer logos on it?
    Could be a 2SD140 or 2SD1406.
     
  3. dave

    dave Guest

    The only other markings on them are a letter "Y" and "GE"!
     
  4. dohi

    dohi Guest

    ------snip--------
    Hi dave, Tom
    Y marking shows hfe rank.
    2SD140 is too old to get info. I think this was not generic use product, but
    special use only for JVC.
    2SD1406 is NPN audio freq. power Tr, discontinued product made by TOSHIBA.
    Substitute product of TOSHIBA is 2SD2531. Datasheet is here.
    http://www.semicon.toshiba.co.jp/td...Transistors/en_20040820_2SD2531_datasheet.pdf
    Center pin of 2SD1406 must be COLLECTOR. You can find BASE pin by using
    your tester or DMM.

    This site is very good. (written in JAPANESE) Site owner says there is no
    guarantee that they are correct.
    http://homepage3.nifty.com/ebina2540/data/data_tr.html
    http://homepage3.nifty.com/ebina2540/data/data_fet.html
    Pin layout of 2SD1406 and 2SD2531 is the same according to this site.

    Good luck,
    dohi
    from Tokyo
     
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