How is voltage rating on capacitor determined ?

dakupoto · 2016-05-22T06:05:36+00:00

Could some electronics guru please shed some light on this ? How is the voltage rating on a capacitor calculated, at design time. For any capacitor, the capacitance is the ratio of charge stored to maximum voltage across the terminals. By measuring the the discharge current and time for a fully charged capacitor to discharge, the total charge stored can be calculated. But that is possible after the capacitor is ready for use. Any hints, suggestions would be of help. Thanks in advance.

May 22, 2016 23 Replies

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George Herold 10 years ago

Figure 6 here

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shows only a 10% change in C for voltages greater than ~40V. (It does look to be dropping like a rock after that... more data would be nice.)

George H.

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John Larkin 10 years ago

I think I could make a parametric amplifier using the nonlinearity of a hi-K ceramic cap. Not that I'd have any use for it.

John Larkin Highland Technology, Inc picosecond timing precision measurement jlarkin att highlandtechnology dott com http://www.highlandtechnology.com

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krw 10 years ago

The X7R curves are very pessimistic. I generally underrate X7Rs about 50% and the datasheets show about 70-80% of the 0V capacitance. Use the datasheets. That's what they're there for.

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George Herold 10 years ago

Bias up the cap and make it a vibration sensor... ? With PA's there's some threshold stimulus.... Does that mean you'd have to wiggle it with AC too?

George H.

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