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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: vallon (jerome.vallon-renexter@renault.com )
Organization:renault
Date posted: Wed Nov 3 10:34:34 US/Eastern 2004
Subject: power semiconductor reliability data
Message:
I search some reliability data about power semiconductor like power MOSFET (75V, 100A) or IGBT (600V, 100A). this kind of device are used in power inverter (DC-AC converter, 40KW) with or without power cycling. thank


Reply:

Subject: IGBT
Reply Posted by: bwd (bdudley@alionscience.com )
Organization: RAC
Date Posted: Wed Nov 3 13:46:22 US/Eastern 2004
Message:
We have some data for IGBT that was based on 100,000 modules that have been in the field for over five years. The trend analysis of the failure returns indicates a failure rate of 100 fits for high power IGBT modules. I ran a calculation using the model in MIL_HDBK-217 and found that for a ground fixed condition the best case failure rate is 96 fits and the worst case is 384 fits. So, we have a pretty good match at 100 fits for low stressed devices. Switching on and off will increase the stress level, so if you have very high duty cycle you should consider a higher failure rate.


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