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how hot can a transistor get

Discussion in 'Electronic Basics' started by j van c, Sep 24, 2004.

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  1. j van c

    j van c Guest

    I changed a transistor on a print with another recommanded transistor.
    He's getting quite hot. I can't hold my finger on it.
    Is this normal?
  2. colin

    colin Guest

    in my experience transistors can work quite hapily but be to hot to touch
    for any lenght of time,
    however i seem to have more sensitive fingers than most people,
    also if it leaves a mark on your finger or even takes skin off then i would
    say its too hot, especialy if it has any heatsink.
    this ocurs much above 60'c i think wich means the silicon is probably a lot
    but typicaly silicon devices are speced up to over 100'c, but reliability
    goes down with increasing temp.

    Colin =^.^=
  3. Wayne

    Wayne Guest

    It is not uncommon for say automotive spec devices to operate between -40 to
    125degC (- 105 + 20degC Delta for board temp) and junction temperatures of
    upto 150degC. Check the datasheet for that device, it should have the
    operating temperature range. If the pervoius device did not get hot then
    the char. of that transistor must differer to the original and how much more
    "heat" it can withstand will again be in the datasheet.

  4. Jamie

    Jamie Guest

    put a heat shink on it.
    it depends also on how fast it gets
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