MIL-PRF-11693E
TECHAMERICA
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Assessment of Average Outgoing Quality Levels in Parts per Million (PPM) .
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Statistical Process Control Systems.
(Copies of these documents are available online at https://www.techamerica.org or from 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 the requirements of this specification and the
specification sheet, the latter shall govern.
3.2 Qualification. Capacitors 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. In addition, the
manufacturer shall obtain certification from the qualifying activity that the QPL system requirements of 3.3 and 4.4
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 an internal documentation system for qualified
products 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 that meets the requirements of 3.3.1 and 3.3.2, respectively. The following MIL-STD-790 exceptions are
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.
3.4 Materials. The materials 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 guaranty of the acceptance of the
finished product.
3.4.1 Impregnating 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.
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