MIL-PRF-19978 Capacitors, Fixed, Plastic \(Or Paper-Plastic\) Dielectric \(Hermetically Sealed In Metal, Ceramic Or Glass Cases\), Established And Non-Established Reliability General Specification ForThis specification covers the general requirements for established reliability \(ER\) and non-established reliability \(non-ER\), direct current \(dc\), plastic or paper-plastic dielectric, fixed capacitors, hermetically sealed in metal or ceramic or glass cases. Capacitors meeting the established reliability requirements specified herein have failure rate \(FR\) levels ranging from 1.0 percent to 0.001 percent per 1,000 hours \(see 1.2.1.9\). These FRLs are established at a 90-percent confidence level and maintained at a 10-percent producer\'s risk and are based on life tests performed at maximum rated voltage and maximum rated temperature. An acceleration factor of 5:1 has been used to relate the life test data obtained at 140 percent of rated dc voltage at the applicable high test temperature to the rated voltage at the applicable high test temperature. This specification also covers removable mounting retainers for use with applicable capacitors \(see 3.1\). A parts per million \(ppm\) quality system is used for documenting and reporting the average outgoing quality of ER capacitors supplied to this specification. Statistical process control \(SPC\) techniques are required in the manufacturing process to minimize variation in production of ER capacitors supplied to the requirements of this specification.

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MIL-PRF-19978K

4.5.1 Verification of qualification (non-ER styles only). Every 12 months, the manufacturer shall provide

verification of qualification to the qualifying activity. Continuation of qualification shall be based on meeting the

following requirements:

a. Group A inspection (see 4.6.1.2).

b. Periodic group B inspection (see 4.6.3).

In the event that there is no production of a single style device during a reporting period and the manufacturer is

listed for more than one style on the QPL, the manufacturer shall certify that they retain the capabilities and facilities

necessary to produce that product. If during three consecutive reporting periods there has been no production of a

given style, the manufacturer may be required, at the discretion of the qualifying activity, to submit a representative

product of that style to testing.

4.6 Conformance inspection.

4.6.1 Inspection of product for delivery. Inspection of product for delivery shall consist of group A inspection.

4.6.1.1 Inspection and production lot.

4.6.1.1.1 Inspection lot. An inspection lot shall consist of all capacitors in one or more styles, produced under

essentially the same conditions, and offered for inspection during a single work month. The sample selected from

the lot shall be representative of the styles in the lot. ER parts shall be kept separate from non-ER parts. The

following styles are considered to be similar and may be combined for conformance and FRL maintenance:

Group

Characteristic

K, M

CQR09, CQR12, CQR13, CQR19, CQR29, CQR32, CQR33, CQR39,

CQR42, CQR43.

E, F, G, or K

CQ72.

All non-ER styles may be grouped by characteristic.

4.6.1.1.2 Production lot. A production lot shall consist of all capacitors of the same style, voltage rating, nominal

capacitance value, and voltage-temperature characteristic. The manufacture of all parts in the lot shall have been

started, processed, assembled, and tested as a group. Lot identity shall be maintained throughout the

manufacturing cycle.

4.6.1.2 Group A inspection. Group A inspection shall consist of the examination and tests specified in table X or

4.6.1.2.1 ER styles.

4.6.1.2.1.1 Subgroup 1 tests. Subgroup 1 tests shall be performed on a production lot basis on 100 percent of

the product supplied under this specification. Capacitors failing the tests of subgroup 1 shall be removed from the

lot. If, during the 100 percent inspection, screening required that more than 5 percent of the capacitors be

discarded, the entire production lot shall be rejected.