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

INTERNATIONAL ORGANIZATION FOR STANDARDS (ISO)

Quality Assurance Requirements for Measuring Equipment, Part 1:

Meteorological Confirmation System for Measuring Equipment.

(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.)

AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)

General Requirements for Calibration Laboratories and Measuring and Test

Equipment (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 sheet, the latter shall govern.

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 for the ER styles. Authorized distributors that are approved to MIL-STD-

790 distributor requirements by the 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 SPC and 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 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.

3.4 Material. The material shall be as specified herein. However, when a definite material is not specified, a

material shall be used which will enable the capacitors to meet the performance requirements of this specification.

Acceptance or approval of any constituent material shall not be construed as a guarantee of the acceptance of the

finished product.

3.4.1 Impregnant and filling compounds. Compounds used in the impregnation and filling of capacitors shall be

chemically inactive with respect to the capacitor element and the case (see 3.5.1). The compound, either in the

state of original application or as a result of having aged, shall have no adverse effect on the performance of the

capacitor. For liquid-filled capacitors, the same material shall be used for impregnating as is used for filling (see