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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: Charles Workman
Date posted: Thu Mar 21 8:47:38 US/Eastern 2002
Subject: failure mode/mech of tantalum capacitors
Message:
We are experiencing failures of tantalum capacitors, they exhibit a resistive (~17K ohm) slope on a curve tracer after approx. 1-2 hours of bias. This failure mode will recover in a few hours and they operate normally, this phenomenon is repeatable. Also, they have recieved a bias burn in prior to use which is unable to screen this problem. Any ideas as to what is causing this?


Reply:

Subject: Tant Caps
Reply Posted by: Joe Dzekevich (jdzekevich@ieee.org )
Date Posted: Fri Apr 12 13:44:24 US/Eastern 2002
Message:
It may be a case of impurities in the tantalum. The impurity may cause a hot spot. The impurity may then burn-out, reflow the tantalum, and self-heal. Just a thought. Joe


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