C3420 transistor: possible replacements

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  • rattlesnake
    Senior Member
    • Dec 2017
    • 78
    • Argentina

    #1

    C3420 transistor: possible replacements

    I found this datasheet, and even if my transistor doesn't have the "2S" written on it, I guess this is the correct datasheet, right? This is also relevant info.

    I was testing an old M919 v3.2 motherboard and doing something I shouldn't have done I damaged the C3420 transistor. Apparently (I'm a noob in electronics) it controls the voltage that is supplied to the CPU. In this case, the damaged C3420 will work with 5v CPUs but not with 3.3v CPUs.

    I had an exact same board laying around and replaced the bad transistor with an identical one and bingo, I was right, that was the problem! 3.3v CPUs work again with this one.

    Now the question is, what are possible, readily available replacements for this transistor?

    I also have a third M919 a-ok that doesn't have the C3420 transistor, but instead it has a couple of D882-0 transistors (if that info helps).
  • alindumitru46
    Badcaps Veteran
    • Aug 2015
    • 255
    • Romania

    #2
    Re: C3420 transistor: possible replacements

    I think you have an very old PCChips motherboard, but you must upload some hi resolutions photos.
    A photo makes more than 1001 words

    Comment

    • eccerr0r
      Solder Sloth
      • Nov 2012
      • 8688
      • USA

      #3
      Re: C3420 transistor: possible replacements

      Don't know what sources you have available.
      You could try a MJE200, not a perfect match but might work.
      D882 is a bit weak but may work too...

      Comment

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        C3420 transistor: possible replacements
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        I was testing an old M919 v3.2 motherboard and doing something I shouldn't have done I damaged the C3420 transistor. Apparently (I'm a noob in electronics) it controls the voltage that is supplied to the CPU. In this case, the damaged C3420 will work with 5v CPUs but not with 3.3v CPUs.

        I had an exact same board laying around and replaced the bad transistor with an identical one and bingo, I was right, that was the problem! 3.3v CPUs work again with this one.

        Now the question is, what are possible, readily available replacements for this transistor?

        ...
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