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.

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

MIL-PRF-83421E

AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM)

Standard Test Method for Flash and Fire Points by Cleveland Open Cup. (DoD

adopted).

(Copies of this document is available from https://www.astm.org or American Society for Testing and Materials, 100

Barr Harbor Drive, West Conshohocken, PA 19428-2959.)

ELECTRONIC INDUSTRIES ALLIANCE (EIA)

Assessment of Average Outgoing Quality Levels in Parts Per Million (PPM). (DoD

adopted).

Statistical Process Control Systems. (DoD adopted).

(Copies of these documents are available from https://global.ihs.com or Global Engineering Documents, Attn:

Customer Service Department, 15 Inverness Way East, Englewood CO 80112-5776.)

2.4 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.

3. REQUIREMENTS

3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the

applicable specification sheets. In the event of any conflict between requirements of this specification and the

specification sheets, the latter shall govern (see 6.2).

3.2 Qualification. Capacitors furnished under this specification shall be products which are authorized by the

qualifying activity for listing on the applicable qualified products list (QPL) before contract award. In addition, the

manufacturer shall obtain certification from the qualifying activity that the QPL system requirements of 3.3 and 4.2

have been met and are being maintained. Authorized distributors that are approved to MIL-STD-790 distributor

requirements by the QPL manufacturers are listed in the QPL.

3.3 QPL system. The manufacturer shall establish and maintain a QPL system for parts covered by this

specification. Requirements for this system are specified in MIL-STD-690 and MIL-STD-790. In addition, the

manufacturer shall establish a Statistical Process Control (SPC) and Part Per Million (PPM) system which meets the

requirements of 3.3.1 and 3.3.2, respectively. The following MIL-STD-790 exception is allowed:

a. Under "Description of production processes and controls", the procedure for identification of each production

lot shall include only "the manufacturer shall as a minimum be able to identify the time period during which

the final production operation was performed on each item of product prior to final test. The date or lot code

marked on each part shall be identified to a production lot."

b. "Traceability" of materials shall not apply.

3.3.1 SPC system. As part of the overall MIL-STD-790 QPL system, the manufacturer shall establish a SPC

system which meets the requirements of EIA-557. Typical manufacturing processes for application of a SPC include

pre-assembly, assembly, encapsulation, and packaging.

3.3.2 PPM system. As part of the overall MIL-STD-790 QPL system, the manufacturer shall establish a PPM

system for assessing the average outgoing quality of lots in accordance with EIA-554-1. Data exclusion, in

accordance with EIA-554-1, may be used with approval of the qualifying activity. The PPM system shall identify the

PPM rate at the end of each month and shall be based on a six month moving average.