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

3.9 Seal.

3.9.1 Liquid-impregnated or solid-impregnated capacitors. When capacitors are tested as specified in 4.7.5, there

shall be no evidence of leakage of impregnant or repetitive bubbling.

3.9.2 Liquid-filled capacitors. When capacitors are tested as specified in 4.7.5, there shall be no evidence of liquid

leakage.

3.10 Dielectric withstanding voltage. When tested as specified in 4.7.6, capacitors shall be capable of

withstanding the potentials specified (see 3.1) without permanent damage, open-circuiting or short-circuiting.

3.11 Insulation resistance. When capacitors are tested as specified in 4.7.7, the following shall apply.

3.11.1 Terminal to terminal. When measured as specified in 4.7.7b(1), the insulation resistance shall be not less

than the values specified (see 3.1).

3.11.2 Terminals to case (when case is not a terminal). When measured as specified in 4.7.7b(2), the insulation

resistance between terminals and case shall be not less than the value specified (see 3.1).

3.12 Capacitance. When measured as specified in 4.7.8, the capacitance shall be within the applicable tolerance

specified (see 3.1).

3.13 Dissipation factor. When measured as specified in 4.7.9, the dissipation factor shall not exceed the value

specified (see 3.1).

3.14 Equivalent series resistance (ESR) (applicable to styles CRH11, CRH12, and CRH13). When measured as

specified in 4.7.10, the ESR (in ohms) shall not exceed the value specified (see 3.1).

3.15 Barometric pressure (reduced) for qualification only. When tested as specified in 4.7.11, capacitors shall

withstand the specified potential (see 3.1) without visible damage, external flashover, open-circuiting or

short-circuiting.

3.16 Vibration, high frequency and random. When capacitors are tested as specified in 4.7.12, there shall be no

evidence of mechanical damage, intermittent contacts of 0.5 millisecond (ms) or greater duration, open-circuiting or

short-circuiting.

3.17 Salt atmosphere (corrosion). When capacitors are tested as specified in 4.7.13, there shall be no harmful or

extensive corrosion, and at least 90 percent of any exposed metal surface of the capacitor shall be protected by the

finish. Harmful corrosion shall be construed as being any type of corrosion which in any way interferes with

mechanical or electrical performance. In addition, there shall be no unwrapping of, or mechanical damage to the

insulating sleeves, when applicable. Marking shall remain legible.

3.18 Immersion. When tested as specified in 4.7.14, capacitors shall meet the following requirements:

Dielectric withstanding voltage:

Insulating sleeves----------------

Shall be greater than 4,000 volts, dc.

Terminal to terminal -------------

Shall be as specified (see 3.1).

Terminals to case (when case is

not a terminal) -----------------

Shall be as specified (see 3.1).

Insulation resistance:

Insulating sleeves----------------

Shall be 10,000 megohms, minimum.

Terminal to terminal -------------

Shall be not less than the specified percent of the initial

requirement (see 3.1).