SRC Forum - Message Replies
Forum: Reliability & Maintainability Questions and Answers
Topic: Reliability & Maintainability Questions and Answers
Topic Posted by: Reliability & Maintainability Forum
Organization: System Reliability Center
Date Posted: Mon Aug 31 12:47:36 US/Eastern 1998
Posted by: Charles Workman
Date posted: Thu Mar 21 8:47:38 US/Eastern 2002
Subject: failure mode/mech of tantalum capacitors
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?
Subject: Tant Caps
Reply Posted by: Joe Dzekevich
Date Posted: Fri Apr 12 13:44:24 US/Eastern 2002
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.