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PCB007-May2020

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56 PCB007 MAGAZINE I MAY 2020 es the performance and qualification require- ments for rigid single-sided, double-sided, and multilayered PWBs with or without plated through-holes. The standard lists acceptable tests and screening methods for verification. Verification is listed in the associated quali- fied product list (QPL-55110). MIL-PRF-55110 was superseded by MIL-PRF-31032 as of De- cember 31, 1997; however, legacy fabrication sites not certified to MIL-PRF-31032 can con- tinue to certify to and build MIL-PRF-55110- part numbers. 2. MIL-PRF-50884 This specification was the first performance military specification for flexible PWBs. The first revision was dated October 1971. It es- tablishes the performance and qualification requirements for flexible and rigid-flex PWBs with or without plated through-holes. The standard lists acceptable tests and screening methods for verification. Verification is listed in the associated qualified product list (QPL- 50884). MIL-PRF-50884 has been superseded by MIL-PRF-31032 as of December 31, 1997; however, legacy fabrication sites not certified to MIL-PRF-31032 can continue to certify to and build MIL-PRF-50884-part numbers. MIL-PRF-31032 Offers a Rewarding Twist What Are Your Revenue Priorities Now? Today's environmental factors have changed business priorities with regard to printed wir- ing boards (PWBs) requiring military specifi- cations (MIL-PRF-55110, -50884, and -31032). These factors require re-evaluating and re-rank- ing revenue streams that until recently seemed very stable. On the positive side, military PWB fabrication is now designated as an "essential" business that must stay open as "nonessential" operations close. This bears consideration for the future. Overview If you are fabricating PWBs to military speci- fications, the master drawing will state: "Fabri- cate to MIL-PRF-55110, MIL-PRF-50884, or MIL- PRF-31032." This sounds very complicated on the surface, but there is a rewarding "twist" if the fabricator is certified to MIL-PRF-31032. Definitions 1. MIL-PRF-55110 This specification was the first performance military specification for rigid PWBs. The first revision is dated September 1960. It establish- From the Hill by Mike Hill, MIL-Q-CONSULTING LLC

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