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The Definitive Guide to an Electronic Assembly Design Review

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The Definitive Guide to an Electronic Assembly Design Review / 4 What is Physics of Failure (PoF)? The knowledge and understanding of the processes and mechanisms that induce failure to predict reliability and improve product performance. What is Mean Time to Failure (MTTF)? The length of time a device or other product is expected to last in operation. What is Mean Time between Failure? The predicted elapsed time between inherent failures of a mechanical or electronic system during normal system operation. 1 Establishing a Reliability (cont.) Best practices include: Set reliability goals based on survivability. This is often bound by confidence levels, such as 95% reliability with a 90% confidence level over 15 years. Avoid mean time to failure (MTTF) and mean time between failures (MTBF) which do not measure reliability. Historically, MTBF has been calculated using empirical prediction handbooks, which assume a constant failure rate that is not always correct. Employ physics of failure (PoF) to acquire a deeper understanding of how your product's desired lifetime and environment affect its design. This takes substantial effort, but you receive a valuable return on investment.

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