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.

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14

MIL-PRF-19978K

APPENDIX A

PROCEDURE FOR QUALIFICATION INSPECTION

A.1 SCOPE

A.1.1 Scope. This appendix details the procedure for submission of samples for qualification inspection of

capacitors covered by this specification. The procedure for extending qualification of the required sample to other

capacitors covered by this specification is also outlined herein. This appendix is a mandatory part of the

specification. The information contained herein is intended for compliance only.

A.2 APPLICABLE DOCUMENTS

A.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.

A.2.2 Government documents.

A.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.

DEPARTMENT OF DEFENSE STANDARDS

Leads for Electronic Component Part.

(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.)

A.2.3 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between

the text of this document and the references cited herein (except for related specification sheets), the text of this

document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations

unless a specific exemption has been obtained.

A.3 SUBMISSION

A.3.1 Single-type capacitor submission. The following details apply:

a. Sample size: As specified in table IX.

b. Sampling criteria: Sample units of the same style, terminal, circuit, characteristic, rated voltage,

capacitance, capacitance tolerance, and vibration grade will be submitted.

c. Extent of qualification:

(1) Circuit diagram 1 will qualify circuit diagram 3 in the same capacitor design.

(2) Qualification in one characteristic does not constitute qualification in any other characteristic.

(3) Any capacitance tolerance may represent all other authorized capacitance tolerances.

(4) Vibration grade 3 will qualify vibration grade 1 provided that the designs of the capacitors are the same.

(5) Qualification of insulated styles will be the basis for qualification of uninsulated styles of the same

design.