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Forum: Reliability & Maintainability Questions and Answers

Topic: Reliability & Maintainability Questions and Answers

Topic Posted by: Reliability & Maintainability Forum (src_forum@alionscience.com )
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998

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Original Message:

Posted by: Cong Nguyen (cong.nguyen@drs-ss.com )
Organization:DRS Technologies-Signal Solutions
Date posted: Thu Jan 29 13:36:22 US/Eastern 2004
Subject: Service Life
Message:
Please show me how to calculate "Service Life" of an electronic product. I appreciate your help very much. Sincerely, Cong Nguyen


Reply:

Subject: Service Life
Reply Posted by: BWD (bdudley@alionscience.com )
Organization: RAC
Date Posted: Mon Feb 2 15:09:14 US/Eastern 2004
Message:
Service life is the length of time until wear out failure. To determine the length of time, you must look at every failure mode and mechanism for every part type electronic component used. The operating and non-operating conditions have to be assessed for the unit and the components. Time to failure equations have been developed for a number of failure mechanisms and conditions but are quite complicated to solve as one needs material characteristics, acceleration parameters and environmental conditions at the sub-component level. Some equations for microcircuits are available in the report "Reliability Analysis / Assessment of Advanced Technologies" RADC-TR-90-72. The Reliability Toolkit has an equation for surface mount solder connections that shows how one calculates the “service life” on page 189.


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