Abstract:

Typically thermal cycle test requirements for printed wiring boards (PWBs) are somewhat arbitrarily established for a particular product. Many programs simply default to a standard test without much quantitative analysis. With product reliability and cost management pressures, developing realistic accelerated test criteria is vital. The procedure described in this paper is based on substantial measured field environment data, a validated acceleration model with a generalized product definition, and statistically-based test requirements. While the particular example is for commercial air transport avionics, the proposed procedure is easily extensible to other high reliability applications.

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