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

4.7.13 Salt atmosphere (corrosion) (see 3.17). Capacitors shall be tested in accordance with method 101 of

MIL-STD-202. The following details shall apply:

a. Test condition letter B (48 hours).

b. Measurements after exposure: Not applicable.

After the test, capacitors shall be visually inspected for evidence of harmful corrosion and unwrapping of, or

mechanical damage to the insulating sleeves, when applicable.

4.7.14 Immersion (see 3.18). Capacitors shall be tested in accordance with method 104 of MIL-STD-202. The

following details and exception shall apply:

a. Test condition letter C, with the following exceptions:

(1) Both hot and cold baths shall be a saturated solution of sodium chloride and water.

(2) For quality conformance inspection only, two immersion cycles and 30 minute exposure shall be required.

b. Inspections after final cycle: Capacitors shall be inspected for evidence of extensive corrosion, obliteration of

markings, and unwrapping of or mechanical damage to the insulating sleeves, when applicable.

c. Measurements after final cycle: Dielectric withstanding voltage and insulation resistance shall be measured

only on the insulating sleeves of case sizes .400 inch diameter x 1.063 inch long and larger at +25�C �3�C as

specified in 4.7.6 and 4.7.7, respectively, except the measurements shall be made between two wire

windings placed around the sleeve of the capacitor .500 inch apart; each winding shall consist of three close

turns of .040 inch (18 AWG) bare copper wire. The insulating sleeves of all sizes shall be removed, and the

dielectric withstanding voltage, insulation resistance, capacitance, and dissipation factor shall then be

measured at +25�C �3�C as specified in 4.7.6 to 4.7.9, inclusive.

4.7.15 Solderability (see 3.19). Capacitors shall be tested in accordance with method 208 of MIL-STD-202. The

following details shall apply:

a. Number of terminations of each capacitor to be tested: 2.

b. Depth of immersion in flux and solder: Both terminals shall be immersed to within .125 inch of the capacitor

body or eyelet closure.

c. No physical damage after test.

4.7.16 Shock (specified pulse) (see 3.20). Capacitors shall be tested in accordance with method 213 of

MIL-STD-202. The following details shall apply:

a. Special mounting means: Rigidly mounted by the body.

b. Test condition letter I.

c. Electrical loading during shock: During the test, a potential of 50 percent of rated voltage shall be applied

between the terminals of the capacitor.