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SM Diode

Discussion in 'Electronic Design' started by Phil, Jan 28, 2004.

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  1. Phil

    Phil Guest

    I am looking for a small signal diode
    in surface mount, is there any smaller
    than SOD110 ?
    current and voltage are not a problem
    just size, I would like similar to 0402
    in size if possible.
    Anyone help?

  2. Is this small enough?
  3. John Larkin

    John Larkin Guest

    The SC-79 is pretty small; I think other people make this package,
    too. The LGA is smaller, but looks nasty to solder.

    SMS7621-079 is about the lowest capacitance packaged diode around...
    measures about 0.22 pF at zero bias.

  4. Phil

    Phil Guest

    Thanks for the information, very useful.
  5. Ian Buckner

    Ian Buckner Guest

    If you want to get _really_ silly, the HSCH53XX beam-lead Schottky's
    are 0.7 by 0.25 mm. Don't try hand soldering these after too much
    The 5310/5330/5340's are 0.1pF at zero bias.

  6. John Larkin

    John Larkin Guest

    Can you solder a beam lead part? I think regular solder will just
    dissolve the beams. I have a sample of an old HP beamlead diode, but
    it's so small it's really hard to find in its carrier.

    You can get chip schottkies down to about 0.04 pF, but they have to be
    wire bonded.

  7. Ian Buckner

    Ian Buckner Guest

    Sure, you just need a steady hand, a magnifier, a fine tip
    soldering iron and _lots_ of antistatic precautions. The
    recommended method is eutectic bonding, but for
    breadboarding it works (with a little practice). I was
    using silver loaded solder to avoid leaching the lands on
    the thick film substrate, don't know if that helped.
    I really needed that <0.1pF capacitance to keep the
    bandwidth above 20MHz...

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