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Cap leakage

Discussion in 'Electronic Design' started by Jamie, Nov 9, 2011.

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  1. Jamie

    Jamie Guest

    I had to buy some BP/NP caps today "16V 470Uf" and the pickings were
    slim. In fact, I was looking for a Axial package of that value
    and could not find any one that had stock of that type or even list it.

    So I ended up getting some Radial types from "NICHICON". "CHicago
    Capacitor" wanted a min or of 3k pieces at .98 etc, we only need 150 but
    at least they were willing to make them. But back to what we ended up

    I notice the leakage was up around 320ua or something, isn't that
    kind of high ?

    I am not really worried about that because of where they are being
    used, which won't get effected by this but really, it just seems high.

  2. John S

    John S Guest

    Hi, Jamie-

    How long did you test the leakage? Try allowing the cap to sit with
    applied voltage for a while and the measure. Let us know how that goes.

    John S
  3. John S

    John S Guest

  4. Jamie

    Jamie Guest

    I have not tested these, its just data I saw at mouser today while I was
    ordering. I was just shocked at the leakage of the BP's compared to
    polarized versions.

    I think mouser must have a miss print..
    and from the MF.

    Leakage looks good from the MF.

  5. Phil Allison

    Phil Allison Guest

    "Jamie = Maynard A. Philbrook fuckwit radio ham.

    ** The figures are exactly the SAME !!!


    ..... Phil
  6. Phil Allison

    Phil Allison Guest

  7. Leakage for regular e-caps is 0.01 or 0.02CV. Special low leakage caps
    (not well stocked in North America, especially in larger sizes) are
    about 1/10 of that (0.002CV, frequently). Those particular BP ones are
    0.03CV. Not a huge difference from the regular ones.

    CV is nominal capacitance * rated voltage to get leakage at rated
    voltage after some period of time. Typically there's also a minimum
    that comes into play for smaller capacitances.

    Actual leakage can be quite a bit lower, and varies quite a bit
    between different constructions and suppliers, but not so much from
    part to part of a given construction.

    Best regards,
    Spehro Pefhany
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