MIL-PRF-39003/9G
APPLICATION NOTES:
1. Rated ripple current is the rms value of the maximum allowable alternating current of a specified frequency, at
which the capacitor may be operated continuously at a specified temperature. Derate ripple current for ambient
temperature in accordance with the curve shown on figure 2.
2. For derating the frequency, use the derated ripple currents at 1 kHz given in table I. Below 1 kHz these same
currents are applicable provided the peak ac voltage does not result in voltage reversal or exceeds the rated dc
voltage. Between 1 kHz and 40 kHz the ripple current may be interpolated linearly with frequency. The ripple
current is applicable at frequencies above 40 kHz.
3. Although style CSR21 capacitors are rated to operate with the specified levels of rms ripple current, they are
basically polar devices. Care must be exercised to assure that sufficient dc bias is applied to prevent ac voltage
reversal in excess of specified reverse voltage ratings (see MIL-HDBK-198).
4. When two or more style CSR21 capacitors are used in parallel, ripple current may not divide equally as a result
of unequal ESR's of the capacitors. It is imperative that each capacitor be operated within the specified limit of
rms ripple current.
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