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MIL-PRF-83421 Capacitors, Fixed, Metallized, Plastic Film Dielectric, \(Dc, Ac, Or Dc And Ac\), Hermetically Sealed In Metal Cases Or Ceramic Cases, Established Reliability, General Specification ForThis specification covers the general requirements for established reliability \(ER\), metallized plastic film dielectric, fixed capacitors, hermetically sealed in metal or ceramic cases. Capacitors covered by this specification have failure rate levels \(FRL\) established in accordance with MIL-STD-690. The reliability for each level is identified by a symbol in accordance with table I. These FRLs are established at a 90 percent confidence level and maintained at a 10 percent producer\'s risk and, unless otherwise specified \(see 3.1\), are based on life tests performed at maximum rated voltage at maximum rated temperature. Unless otherwise specified \(see 3.1\), an acceleration factor of 5:1 has been used to relate life-test data obtained at 140 percent of rated voltage at maximum rated temperature, to rated voltage at maximum rated temperature \(see 6.1\). A part per million \(PPM\) quality system is used for documenting and reporting the average outgoing quality of capacitors supplied to this specification. Statistical process control \(SPC\) techniques are required in the manufacturing process to minimize variation in production of capacitors supplied to the requirements of this specification.

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MIL-PRF-83421E
APPENDIX A
A.3.1.4 Impregnant. Two-hundred cubic centimeters of each impregnant used in the specimens for which
approval is sought shall be submitted. On subsequent submissions, an impregnant that has successfully withstood
the flash point of impregnant test (see 4.7.26) need not be submitted.
A.3.2 Description of items. The manufacturer shall submit a detailed statement of the materials and constructional
features of the capacitors being submitted for test, including information on whether they are liquid-impregnated; the
type and quantity of the impregnant; the type, thickness, and number of layers of the capacitor tissue; and material,
thickness, and applied finish of the case.
A.4 EXTENT OF QUALIFICATION
A.4.1 Single type submission. Qualification of a capacitance type will be restricted to the dielectric material, rated
voltage, and capacitance value submitted. Capacitance-tolerance qualification will be restricted to the capacitance
tolerances equal to and wider than the tolerance submitted. Extent of FRL qualification shall be as specified in A.4.4.
TABLE A-I. Samples for complete qualification submission.
Quantity for complete
Style
Qualification group
Types to be submitted
qualification groups 1/
CRH01
30 V
Maximum capacitance value
45
CRH02
50 V
Maximum capacitance value
45
CRH03
100 V
Maximum capacitance value
45
CRH04
200 V
Maximum capacitance value
45
CRH05
400 V
Maximum capacitance value
45
CRH11
100 V
Maximum capacitance value
45
CRH12
200 V
Maximum capacitance value
45
CRH13
400 V
Maximum capacitance value
45
CRH31
30 V
Maximum capacitance value
45
CRH32
50 V
Maximum capacitance value
45
CRH33
100 V
Maximum capacitance value
45
CRH34
200 V
Maximum capacitance value
45
CRH35
400 V
Maximum capacitance value
45
1/ This total shall be determined by the number of capacitors tested for random vibration in group X.
A.4.2 Single style submission. Qualification of the capacitance types submitted will be a basis for qualification for
all capacitance values and case sizes in the style. If the tightest capacitance tolerance is included, complete
capacitance range qualification may be granted. Extent of FRL qualification shall be as specified in A.4.4.
A.4.3 Complete qualification group submission. Qualification of the complete qualification group submission will
be the basis for qualification for all styles within a specification sheet, dielectric materials, rated voltages, capacitance
values, and capacitance tolerances; if the tightest capacitance tolerance is included in at least one style, complete
capacitance range, qualification may be granted. Extent of FRL qualification shall be as specified in A.4.4.
A.4.4 FRL qualification. The extent of qualification between FRLs shall be as specified in table A-II.
TABLE A-II. Extent of FRL qualification.
Qualification for FRL
Will qualify FRL(s)
S
S, R, P, M
R
R, P, M
P
P, M
M
M
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