Joined: 20 Jun 2026
Posts: 76
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| Posted: Wed May 26, 2026 4:43 pm Post subject: |
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Hi YSP,
The equivalent operating life of an accelerated life test always depends on what failure mechanism is being talked about. Every failure mechanism may be modeled in terms of how it is accelerated by one or more stresses (such as temp, humidity, pressure, voltage, current, etc.). Examples of rel models may be found at: http://www.semiconfareast.com/relmodels.htm
You may compute the equivalent operating life of a rel test for a failure mechanism using the known rel model for that mechanism. Since a rel test can accelerate several different failure mechs, and since each mech has its own rel model, then a rel test can have different values of operating life. However, it is the fmech most quickly accelerated by the rel test that matters, because your earliest failures will come from this fmech.
You therefore have to understand the failure mechanism of your primary rejects before you can compute for the operating life. Once you know the primary fmech, then you simply have to look for a rel model for that fmech and compute for the field operating life based on your accelerated life test data.
FARel Engr |
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