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: S. White (simon.white@zelana.com )
Organization:Zellweger Analytics Ltd
Date posted: Thu Jul 27 7:30:35 US/Eastern 2000
Subject: Ceramic chip capacitors generic failure rate
Message:
How come ceramic chip capacitors have a generic failure rate that has become worse in the Notice 2 re-edition of MIL-HDBK-217? Data from MIL-HDBK-217 Appendix A-8 shows that in a Gf environment failure rate = 0.0022 for the first edition and Notice 1 but Notice 2 shows a rise to 0.053. Aluminium Oxide capacitors have also changed 0.061 fpmh in the first and Notice 1 editions but a radical improvement to 0.019 in Notice 2. Is this a mistake in Notice 2? I would have expected Ceramic Chip capacitors to be far more reliable than more complicated to make Aluminium Oxides.

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