04034510A-TR Abstract: Comparing the Effectiveness of Stress-based Reliability Qualification Stress Conditions

SEMATECH DOC ID #: 04034510A-TR

Title: Comparing the Effectiveness of Stress-based Reliability Qualification Stress Conditions

Author(s): Andreas Preussger;Nick Lycoudes;Noel Durrant;Richard Blish;Steve Huber;

Document date: 04/12/2004

Descriptor(s): reliability testing;accelerated testing;component testing;temperature;humidity;operating cycle;

Abstract: The accelerated stress regimens used to characterize failure
rates in reliability qualification procedures mimic various
environmental aspects of the products' usage conditions. A simple
figure of merit-percent of usage conditions simulated-was devised
to compare how well the simulated environment applied during
reliability qualification corresponds to the application
environment. Automotive and telecom standards were used as
reference procedures, adding necessary assumptions to complete
acceleration factor calculations. Assumptions and calculations to
arrive at the figure of merit for high temperature operating
life, temperature humidity bias, and temperature cycling stresses
are presented. A wide range is observed in the figure of merit,
implying the standardized stresses used may overstress or
understress the component.

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