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Endurance of tantalum caps

Discussion in 'Electronic Design' started by Klaus Kragelund, Dec 14, 2012.

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  1. Hi

    If we ignore the discussion about tantalums and dv/dt susceptibility, and focus on endurance. I have looked at different caps

    http://www.vishay.com/docs/40004/592d.pdf

    Goes into FIT numbers in this page:

    http://www.vishay.com/docs/40110/faq.pdf
    (last page)

    Stating a FIT of 5, which is good

    Another one from Nichecon:

    http://www.nichicon.co.jp/english/products/pdfs/e-f72_75.pdf

    States endurance of 2000 hours at 85 degrees dropping 10% rated capacitance. But, will this curve stay one the same trend, so about 20% rated capacitance reduction at 4000 hours? (seems to me this is a very bad cap and can be used for next to nothing)

    Anyone has experience of tantalums and capacitance versus lifetime in general?

    Thanks

    Klaus
     
  2. Robert Macy

    Robert Macy Guest

    What mechanism 'ages' a tantalum cap?

    Low esr?! wow, that esr is really 'case' sensitive.

    The Vishay data sheet, pg 9, has the 'fishiest' looking plots I've
    ever seen. Like to extend your question to ask if esr indeed acts so
    perversely? And, what mechanism causes the esr to increase so much as
    the frequency approaches DC?
     
  3. Tim Williams

    Tim Williams Guest

    Damping factor (dielectric loss). Which is usually modeled as a parallel
    R+C or something like that (at a given frequency), but then, it's
    *equivalent* series resistance, so that's okay.

    Tim
     
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