MIL-PRF-20 Capacitor, Fixed, Ceramic Dielectric \(Temperature Compensating\), Established Reliability And Non-Established Reliability, General Specification ForThis specification covers the general requirements for established reliability \(ER\) and non-ER, temperature compensating, fixed capacitors for use primarily where compensation is necessary for circuit applications due to temperature changes, in bypass and coupling applications. Capacitors meeting the ER requirements specified herein have a failure rate level \(FRL\) ranging from 1.0 percent per 1,000 hours to 0.00l percent per 1,000 hours. These failure rate levels are established at a 90-percent confidence level based on the life test parameters specified and are maintained at a 10-percent producer\'s risk. An acceleration factor of 8:1 has been used to relate the life test data at 200 percent of rated voltage at the applicable high test temperature to the rated voltage at the applicable high test temperature. A part 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-20M

DEPARTMENT OF DEFENSE STANDARDS

Test Method Standard Electronic and Electrical Component Parts.

Failure Rate Sampling Plans and Procedures.

Established Reliability and High Reliability Qualified Products List (QPL) Systems for

Electrical, Electronic, and Fiber Optic Parts Specifications.

Environmental Engineering Considerations and Laboratory Tests.

Marking of Electrical and Electronic Parts.

(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.)

2.3 Non-Government publications. The following documents form a part of this document to the extent specified

herein. Unless otherwise specified, the issues of the documents are those cited in the solicitation or contract.

TECHAMERICA

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

Statistical Process Control Systems.

(Copies of these documents are available from https://www.techamerica.org/ or TechAmerica, 601 Pennsylvania

Ave., NW, North Building, Ste.600, Washington DC, 20004-2650.)

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 sheet, the latter shall govern.

3.2 Qualification. Capacitors and retainers furnished under this specification shall be products that are authorized

by the qualifying activity for listing on the applicable qualified products list (QPL) before contract award (see 4.4 and

6.3). Authorized distributors that are approved to MIL-STD-790 distributor requirements by QPL manufacturers are

listed in the QPL.

3.3 Qualified Products List (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.

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

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

but are not limited to the following: Application of termination, assembly, chip firing, green chip assembly, dielectric

material manufacture, 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.