Forum Questions and Answers
Topic: PRISM Questions and Answers
Topic Posted by: SRC ( )
Organization: SRC
Date Posted: Wed Jan 12 8:33:33 US/Eastern 2000
Topic Description: Welcome to the PRISM forum! Please feel free to post your questions and comments about the PRISM assessment software here.

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Original Message:
Posted by: George Pyryt ( )
Organization:Draper Lab
Date posted: Fri Jun 9 15:58:04 US/Eastern 2000
Subject: Non-op electrical overstress factor
During the calculation of failure rates, Prism includes a serperate term for electrical overstress failure rate for all models. If I am trying to calculate the failure rate during storage over a long period of time, I do not think the electrical overstress should be that large of a factor. Is there a suggested factor or approach that I could use to reduce the part failure rate by when evaluating storage reliability. The failure rate Prism gives for a given resistor for example can be 2 orders of magnitude larger than if using the Mil-Std-217 data reduced by a factor of .01 for storage. The Prism failure rate I used included your previous suggestion of using 0 degree temperature rise for each component and 0% duty time.
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