MIL-C-25F
1.2.1.7 Capacitance tolerance. The capacitance tolerance in percent is identified by a single letter in accordance
with table IV.
TABLE IV. Capacitance tolerance.
Symbol
Capacitance tolerance (percent)
K
±10
V
+20, -10
1.2.1.8 Vibration grade. The only vibration grade still available is grade 1 (10 to 55Hz).
1.2.2 Voltage rating versus temperature. Capacitors of characteristic K have a dc voltage rating for continuous
operation at +85°C, and capacitors of all other characteristics have a dc voltage rating for continuous operation at
+40°C as specified (see 3.1). Voltage derating at other ambient temperatures may be necessary in order to realize
The permissible operating voltages, while based on incomplete data, are the capacitor supplier's best estimate to
provide a life expectancy of 8,800 hours of continuous operation at high ambient temperatures. Longer life can be
expected of all types by operation at still lower voltages; for example, a life expectancy of approximately 44,000 hours
may be obtained by operation at 70 percent of the voltage specified. Also a life longer than 8,800 hours may be
expected at the voltage specified if the high temperature prevails for only a portion of the whole operating time.
1.2.2.1 AC component. The rating given is the steady-state dc voltage, or the sum of the dc voltage and the peak
ac voltage, provided that the peak ac voltage does not exceed 20 percent of the rating at 60 Hertz (Hz), 15 percent at
120 Hz, or 1 percent at 10,000 Hz. Where heavy transient or pulse currents are encountered, the requirements of
this specification are not sufficient to guarantee satisfactory performance and due allowance must be made,
therefore, in the selection of a capacitor.
2. APPLICABLE DOCUMENTS
2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This
section does not include documents cited in other sections of this specification or recommended for additional
information or as examples. While every effort has been made to ensure the completeness of this list, document
users are cautioned that they must meet all specified requirements documents cited in sections 3 and 4 of this
specification, whether or not they are listed.
2.2 Government documents.
2.2.1 Specifications. standards. and handbooks. The following specifications, standards, and handbooks form a
part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are
those cited in the solicitation or contract (See 6.2).
DEPARTMENT OF DEFENSE SPECIFICATIONS
-
Capacitor, Fixed, Paper (or Plastic) Dielectric, Direct Current, (Hermetically
Sealed in Metallic Cases), Styles CP53, CP54 and CP55.
-
Capacitor, Fixed, Paper-Dielectric, Direct Current, (Hermetically Sealed in
Metallic Cases), Styles CP67 and CP69.
DEPARTMENT OF DEFENSE STANDARDS
-
Test Method Standard Electronic and Electrical Component Parts.
(Copies of these documents are available online at https://assist.daps.dla.mil/quicksearch/ or from the
Standardization Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.)
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