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: Anuradha (pa.anuradha@tbg.tvse.co.in )
Organization:TVS Electronics
Date posted: Sat May 31 2:16:09 US/Eastern 2003
Subject: PCB laminate Failure modes while we use SMT
Message:
I had carried out reliability prediction for a circuitry.I am using chip resistors (quarter watt,) and capacitors that doesn't dissipate heat much.Reliability prediction software is asking for PCB Substrate .For FR4 Material iam getting 58 FITS,There is one more calssification Epoxy Glass for which i am getting 22 FITS. As i know FR4 is made of Epoxy and woven glass.What factor makes the huge difference in Failure rate of PCB Substrate.What are the factors (like Tg,) that will affect reliability of PCB laminate especially when we use SMT (SMD components)

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