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polymer aluminum caps

Discussion in 'Electronic Design' started by John Larkin, Dec 6, 2007.

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  1. John Larkin

    John Larkin Guest

    The previous post reminded me:

    I've started using polymer aluminum caps, the United Chem-Con
    surface-mount ones. They seem ideal: very low esr, no explosive
    mechanism, potentially long life, cheaper than tants, and capacitance
    holds up at -40C.

    I tested a couple of 100 uF, 16 volt parts. Forward leakage is low,
    reverse leakage similar or a bit less than a wet lytic.

    I slowly increased the voltage and, unlike a wet cap, the leakage
    didn't go up much. At about 35 volts, it suddenly failed shorted,
    which seems fair to me.

    Pretty good so far. Anybody got experience or advice about these
    things?

    I've read that moisture may degrade the polymer, and cause a loss of
    capacitance over time, but I don't know the numbers. So I guess it's
    prudent to overkill a lot on capacitance, which is generally easy,
    since they are pretty dense.

    John
     
  2. Boris Mohar

    Boris Mohar Guest

    One of my customers is using Sanyo polymer caps. We used them to tame high
    ripple currents power supplies.

    I get them from
    http://www.capacitorsplus.com/
    http://www.capacitorsplus.com/sanyo.htm

    Very nice company to deal with.




    Regards,

    Boris Mohar

    Got Knock? - see:
    Viatrack Printed Circuit Designs (among other things) http://www.viatrack.ca

    void _-void-_ in the obvious place
     
  3. ehsjr

    ehsjr Guest

    What kind of pulse voltage rating do they have?

    Ed
     
  4. qrk

    qrk Guest

    I've used the Panasonic Al polymer caps in medium current (6 Amps)
    switching power supplies. Work great and haven't had any problems,
    even when pressurized to 10,000 psi. They do have very nice qualities.
     
  5. John Larkin

    John Larkin Guest

    I don't think they do. And the highest voltage rating I've seen is 16.

    John
     
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