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ceramic chip capacitor leakage?

Discussion in 'Electronic Design' started by dave94024, Jan 31, 2007.

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  1. dave94024

    dave94024 Guest

    Anyone have a sense for what the leakage range for ceramic chip
    capacitors (0201 - 0603 packages) is?

    In particular I'm looking for a 10nf 25-50v ceramic cap in let's say
    an 0402 package with about a +/-10% tolerance or better.

    Any idea?

  2. Joerg

    Joerg Guest

    Very little, in the nA range IME. But you need to consult the data sheet
    which lists the maximum.
  3. dave94024

    dave94024 Guest

    That was my opinion as well, but I haven't found a datasheet for a
    ceramic chip cap with leakage information in it. Do you have one? Or
    know where I could find one?

  4. Check the data sheets and get back to us if you don't understand the
    specs. It is too insignificant to matter in most (not all) cases.

    Best regards,
    Spehro Pefhany
  5. dave94024

    dave94024 Guest

    For example, the following are datasheets for ceramic caps.
    F3102_X7R.pdf/$file/F3102_X7R.pdf Data/X7R (C).pdf

    I couldn't find anything relevant to leakage in the first two
    datasheets. The third datasheet had some numbers for the insulation
    resistance, is this equivalent to Rp (parallel leakage resistance) for
    the part? If so, we are looking at something on the order of 1na
    which works for my application.

  6. chuck

    chuck Guest

    Insulation resistance is basically the DC leakage resistance. Here's a
    link to some additional info:

  7. dave94024

    dave94024 Guest

  8. TDK says 10G minimum after 60s at rated voltage, at least for these

    Yes. The AVX spec is the lesser of 100G or 1000M-uF. Since you have
    0.01uF, the two numbers are the same. Above 10n the dielectric leakage
    appears to dominate, below it's the 'package' leakage is my
    interpretation of the specs.

    Best regards,
    Spehro Pefhany
  9. Paul Burke

    Paul Burke Guest

    If it's that critical, I suspect the leakage along the surface of the
    board will be greater.
  10. Joerg

    Joerg Guest

    Ok, Dave, I also happened to need resistance info on a 10uF/4V ceramic
    cap in a design today because this design uses it in a timing circuit.
    Here is its data sheet and the info is at the top of page 4:
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