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Need Diode replacement or equivalent

Discussion in 'Electrical Engineering' started by Matthew Crema, Nov 7, 2003.

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  1. Hello,

    I have blown a diode in an old function generator and need to replace
    it. The circuit board indicates that it was a zener diode, but I don't
    know what the breakdown voltage was.

    The diode has the part number "2 2B2" or "2 282" (It's hard to read)
    but I haven't been able to find the specifications anywhere. The diode
    is in a DO-35 package.

    Has anyone come across this part or know of a replacement?

  2. Hi,

    The function generator is a Tektronix CFG253. I called them this
    morning, and left a message, but they haven't called back yet.

    I had another function generator of the same model and I extracted the
    diode in question. It appears to break down at about 1.5 Volts.

    I checked out Digi-Key and others, but a search by the part number
    doesn't obtain any results, and they don't supply any zener diodes with
    breakdown voltages this low.

    I made a temporary fix that seems to do the trick. It is a parallel
    combination of 1 signal diode from ground with two signal diodes in
    series to ground. I'm calling this a "~1.2V zener diode", but I'd like
    to get a replacement part anyway, so I'm going to keep searching.

    Thanks for the quick response.

  3. Dick

    Dick Guest

    An old Archer book says that a 2B2 is a 276-1114, 1000V, 2.5A General
    Purpose type.
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