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Jellybean electrolytic capacitors

Discussion in 'Electronic Design' started by Winfield, Nov 21, 2007.

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  1. Winfield

    Winfield Guest

    What do you think is a good general-purpose low-cost
    versatile jellybean aluminum electrolytic capacitor line?
    I'm looking for a manufacturer and specific product line.
    When I say versatile, I mean available in a wide range of
    part values and operating voltages, and physical sizes.
  2. John Larkin

    John Larkin Guest

    Why not just buy whatever's in Mouser or Digikey? They all seem pretty
    much the same, if you don't need exotica like special ESR or

  3. Because its for a table in the new edition?
  4. Close - it's for a scatterplot of esr vs size for
    our new Chapter 1X capacitor-properties discussion.
    I've measured a mass of parts from our stock drawers
    plus some we've ordered for the purpose, and it's
    quite interesting to see what an extreme variation
    of performance can be seen.

    I'd like to order a wide selection from one or two
    lines and be able to specifically mark them on the
    plot - obviously it'd be most useful if they're
    good parts to choose. For example, I used to get
    lots of Panasonic HFS series parts - reasonably-low
    esr, not too expensive, with a wide range of values
    and voltages available, but, it's been discontinued.
    I haven't yet chosen a replacement for our stocks.
  5. Eeyore

    Eeyore Guest

    I have found Samwha's product to be very reliable in high volume production.

    The other brand I tend to use is Panasonic.

  6. Eeyore

    Eeyore Guest

    I've just been speccing such a part myself.

    It's 1000uF/25V and the 2 best candidates I found on Farnell's site had ESRs of
    38 mohm (Panasonic) and 21 mohm (Nichicon). I forget the product series. Here
    you go.

    There were worse of course.

  7. John Larkin

    John Larkin Guest

    Oh. How about NEC or Nichicon? They probably make their own stuff.
    I have a scatterplot of power transformer weight vs power, if
    anybody's interested.

  8. Yes, I'm interested!
  9. Joerg

    Joerg Guest

    Hey, can you guys include a small picture of a tantalum turning into a
    rocket? With that orange-greenish streak spewing out the bottom and
    maybe an impressive cloud?
  10. I wonder if esr and other such parameters mean much
    in your high-volume application? I had a few Samwha
    caps in my drawers, and was surprised at how poorly
    they did. But then they may have been quite old.

    That's one of the reasons I'm buying new parts for
    the rest of the graph measurements (the old ones
    will be left in for comparison).
    DigiKey has long been a serious Panasonic stocker,
    and I've gotten used to their caps, at least a few
    of the types, such as the HFS I mentioned earlier.
    They tested very well, BTW. Now I'm looking at
    Nichicon, which was suggested to me elsewhere.
    For example their PW series look appealing.
  11. Joerg

    Joerg Guest

    But please, please teach the readers _not_ to design the transformer so
    it'll work nicely at 120V, saturate at 130V and then go up in smoke at
    132V. I've been through several reviews where in the end it was "oh, but
    at this point that's all the space we've got".
  12. qrk

    qrk Guest

    Another interesting difference is the esr beteween axial and radial
    leaded Al electrolytics.
  13. Eeyore

    Eeyore Guest

    I wasn't using the Samwhas in a low ESR application, just their plain vanilla

  14. Can you provide us with a nice photo?
  15. Really? I've just been measuring the radial-lead
    parts from my drawers, and was planning on ordering
    only that style, is that a mistake?
  16. Fred Bartoli

    Fred Bartoli Guest

    Winfield Hill a écrit :
    I don't think so. But I think you should not miss oscons which are
    excellent in many aspects.
  17. John Larkin

    John Larkin Guest

    Buy better lams.

    We had one transformer, not too big, 10 pounds maybe, that ran warm
    and, if you teased the power switch, would make the wiring in the
    walls thump audibly at turnon. We measured close to 1000 amps peak
    current. It would also fry varnish at 130 volts.

    Here's the transformer plot for Win...

    This graph was really hard to shoot... terrible Moire' effects.

  18. John Larkin

    John Larkin Guest

  19. Hmm. Anybody else?
    Yes indeed!

    I've bought quite a few organic electrolyte parts for
    test, plus three values of OS-CONs we got as samples
    from their distributor, Capacitors Plus. But I wonder
    how hard they normally are to get in small quantities,
    since they aren't available from regular distributors?
  20. John Larkin

    John Larkin Guest

    Digikey has the United Chemi-Con polymers. Nice, very low esr, hold up
    below 0 degrees C. But only up to 16 volts.

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