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Low dissipation factor capacitors

Discussion in 'Electronic Components' started by [email protected], Oct 31, 2008.

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  1. Guest

    I've just learned that Panasonic is obsolecsing a whole bunch of their
    capacitors. (Production has been getting emails from digikey for a
    while but told me about it at today.)
    We use the Panosonic P-series caps for their low dissipation factor in
    a bunch of high Q filter circuits. The dissipation factor is quoted
    as 0.1% at 1kHz. Is there another supplier of 'good' polypropylene
    capacitors? Or is Panasonic making a replacement part. (I fired off
    an email to Panasonic but don't expect to hear back till Monday.

    Thanks,

    George Herold
     
  2. Boris Mohar

    Boris Mohar Guest

    Try Wima http://www.wima.de/EN/mkp2.htm
     
  3. Eeyore

    Eeyore Guest

    Loads of people make polypropylene caps. From experience Epcos has
    possibly the largest range.

    Where does one buy 'bad' polypropylene from btw ?

    Graham
     
  4. Guest

  5. Guest

    Excellent! The big ones must be expensive.
    Hmmm, I don't know. I suposse I could try rolling you some bad ones,
    they'd cost though.
    Thanks
    George
     
  6. Eeyore

    Eeyore Guest

    They have an astonishing range, both metallised film-foil and film-foil-film
    for ultimate performance. All with detailed charts showing max dV/dt or Amps
    vs freq etc.

    Polypropylene caps are always a bit expensive. For cheaper try Samwha. They
    look like those green dipped mylar caps but are dipped blue ? I think and they
    do give some transient data. I think they designed them for TV sets.

    Graham
     
  7. Eeyore

    Eeyore Guest

    Vishay-BC (ex Philips passives) probably still do some too. The Philips range
    used to include lovely 1% tolerance smaller value ones. Brilliant for
    filters. Also in giveawy blue. That range was only radial though and didn't
    go to high values.

    Graham
     
  8. Eeyore

    Eeyore Guest

    Not to forget the British ! LCR are still making them.

    http://www.lcrcapacitors.co.uk/

    AND polycarbonate and polystyrene ! Must be about the last people in the
    world doing that !

    Graham
     
  9. Eeyore

    Eeyore Guest

    LMAO !

    Graham
     
  10. Eeyore

    Eeyore Guest

    The Epcos polypropylenes are all AFAIK in blue plastic boxes. Blue seems to be
    the typical colour for polypropylene.

    What was the PRR on your laser ?

    Graham
     
  11. Eeyore

    Eeyore Guest

    Those sound more like polyester to me. No need ever for polypropylenes in an
    audio crossover. Can you give me some series numbers ?

    How slow ?

    Photograhic high power flash units simply use purpose designed electrolytics
    designed for ultra-fast discharge. About 1000uF @ 320V !

    Graham
     
  12. Doing polystyrene caps ? Well, Mouser sell cheap ones under
    their "Xicon" house brand. Their published C vs. temp curves
    don't look as good as the figures on LCR's data sheets, though.
     
  13. Eeyore

    Eeyore Guest

    Polystyrene caps are as rare as hen's teeth now. LCR say the film is no
    longer made but they've got stock for something like 15 yrs production at
    current rates.

    Graham
     
  14. Guest

    "include lovely 1% tolerance smaller value ones. Brilliant for
    filters. "

    Wonderful! I've been using 2% tolerance caps from Panasonic and had
    ordered some of their new 1% ones for a new filter design. I was
    looking forward ~1% 'out of the box' performance.

    George
     
  15. ebest

    ebest

    3
    0
    Nov 4, 2008
    maybe it's a fake one
     
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