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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

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Original Message:

Posted by: Christophe Crocombette ( )
Organization:Electricite de France
Date posted: Tue Feb 9 7:42:22 US/Eastern 1999
Subject: Reliability of electronic parts and long time storage
My company is being storing some obsolete parts for maintenance activities. I am looking for any information about the subject of electronic parts and long time storage : - failure mecanisms, - state of art of long time storage conditions in the industry - etc. If you cope with the same problem, please let me know what your approach is... I have also some specific questions : Is dry nitrogen with regulated temperature (systematically) used for long time storage ? Are there specific recommandations about long time storage of electronic parts ? Is there a predictive method to calculate the reliability during long time storage ? Thank you ! Chris

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Subject: Storage
Reply Posted by: Mark Mobley ( )Baker Hughes Inteq
Date Posted: Tue Mar 23 11:48:45 US/Eastern 1999
Nitrogen storage - Use dry nitrogen, plastic packages may absorb up to 6% or more of their weight in moisture. After a bake out, if possible vacum pack the components in a dry nitorgen atmosphere with desicant. Note moisture gets to the IC, the passivation glass in the IC may have phosphorous in it, hence you get phosphoric acid. This is valid especially for older parts before nitrides were commonly used.

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