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Help with diode part number

Discussion in 'Electronic Repair' started by Stephen, Feb 18, 2005.

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  1. Stephen

    Stephen Guest

    I've got a shorted diode in a power supply. The diode is very small
    and I cannot figure out a replacement part. I think its a zener or
    switching diode. It is the redish gold color type with a black band.
    Its very very small and the only numbers on it are 442 (but it could be
    244 or 424 since the number wrap around).

    Anyone have an idea what the specs are for this so I can replace it?

    Thanks,
    Stephen
     
  2. Guest

    Stephen,

    Does a 24 volts Zener sound reasonable?

    I encountered two of a similar type diode, with 3 nubers that wrap
    around the tiny diode, in a Pioneer receiver last week. I entered
    the model # and circuit reference designator on Pioneer's customer
    service website, and found they were MTZJ- series zener diodes, and
    one of the three numbers is actually a letter. Your 244 is likely
    24A, and would be MTZJ-24A.

    These are 0.5 watt Zeners made by Leshan Radio Corp in China. They
    are spec'd to run at 5 mA current, lower than the common U.S. 1N52xx
    series zeners. The letter suffix denotes where in the tolerance range
    the actual voltage is, A is at the low end, D at the high end of the
    +/- 5% tolerance range.

    Mike
    WB2ME
     
  3. Stephen

    Stephen Guest

    Thanks for the reply Mike. Its worth a shot.
     
  4. Jamie

    Jamie Guest

    if its a 1n244 then is a 1 amp silicone diode rated rated around 600 V
    per NTE
    any other number indicates from NTE that is a zener diode and that
    you need more info.
     
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