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X5R characteristics

Discussion in 'Electronic Design' started by Boris Mohar, Apr 25, 2004.

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  1. Boris Mohar

    Boris Mohar Guest



    I am looking for a voltage coefficient or a suitable graph for X5R type
    capacitors. I looked at usual sources like AVX, TDK, Murata etc and this
    seems to be a well kept secret.
  2. Robert Baer

    Robert Baer Guest

    Try the following, and use the data sheet link (does not work for me
    because i do not have flash):

    Failing that, get:

    I know there are other references, but this should suffice.
  3. This has lots of info, but details only on the X7R type:
    This one covers Z5U:
  4. Boris Mohar

    Boris Mohar Guest

  5. Boris Mohar

    Boris Mohar Guest

  6. Tam/WB2TT

    Tam/WB2TT Guest

    It's there. You have to download their catalog and browse through it. I
    can't remember which web site I looked at, but think it was either AVX or
    Murata. You could ask your salesman to point you in the right direction.

  7. legg

    legg Guest

    Pages 10 and 11 of the original reference give voltage dependance ( AC
    and DC) of X7R.

    X5R is the same dielectric material grade, but cannot be temperature
    characterized above it's operating limit of 85degC. X5R charts are X7R
    charts truncated at 85degC.

    Voltage dependance of capacitance, as a function of the rated voltage,
    remains the same. This is why the X7R tables are provided on the X5R
    data sheet (same difference as between mil AX and BX).

    This temperature limit reflects only the manufacturing quality process
    and failure rates expected with the layer thicknesses used to obtain
    greater CV per unit volume. They are market driven - not strictly
    material driven - as high volume commercial demand justifies the less
    stringent process. Generally an X5R part is seldom available, after
    the X7R quality level is established for that part, at the same

    The published data is only applicable for this specific manufacturer's
    product. SpiCap3 software is available from AVX to provide a visual
    illustration of typical performance of the two dielectrics.

    As an example, 0.47 uf is offered in both dielectrics in 1206 body
    size - one rated at 50V, the other at 35V. Both show the same
    predicted capacity when stressed to 35V, though this is obviously a
    different stress level for these two parts. The voltage rating has
    been established through demonstration, rather than through a process

    Both software dielectric models show a 25% reduction in C at the rated
    voltage (10V), in higher (but different) capacity parts with the same
    body size, though the published table predicts 10%.

  8. Robert Baer

    Robert Baer Guest

    Look at pages 10 and 11 in the PDF for AC and Dc voltage curves.
    Granted, even tho the PDF is supposed to cover X5R, those curves are
    designated for the X7R type.
    On page 10, the document speaks of class 1 and class two dielectrics;
    this may be of help.
    Perhaps a PDF covering another of their dielectric type may have more
    definitive info.
  9. Greg Neff

    Greg Neff Guest

    EIA standard 198 might have what you need, but it will cost you $58 to
    find out...


    Greg Neff
    VP Engineering
    *Microsym* Computers Inc.
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