SRC Forum - Message Replies


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

Back to message list Topics List About this forum
Original Message:

Posted by: Richard Smith (atari_400@hotmail.com )
Date posted: Tue Feb 19 8:54:28 US/Eastern 2002
Subject: Specification for PCB Insertion Cycles
Message:
Just wondering if anybody knows of a specification (mil-spec or otherwise) that defines how many times a PCB should be able to be inserted onto a card edge connector before the laminate deteriorates or the contacts start to peel. For example, a computer video card being inserted and removed from a PC motherboard. I would appreciate any info that anybody has. Thanks in advance.


Reply:

Subject: Connector Contact Delamination
Reply Posted by: B.W.Dudley (bdudley@alionscience.com )
Organization: Reliability Analysis Center
Date Posted: Tue Feb 26 9:40:46 US/Eastern 2002
Message:
The specifications that I could find on connector cycling indicate that they will survive at least 500 cycles before failure. This cycle rate usually causes a contact resistance change due to wear of the pins and receptacle and corrision. In a paper by IBM representatives, "Developing Durable Connectors for Notebook Computers" I found that they were able to produce nickel and fold plated connectors that would survive 5,000 to 10,000 cycles without change in the insertion and withdrawal forces, hence no delamination.


Reply:

Subject: Re: Specification for PCB Insertion Cycles
Reply Posted by: Richard Smith (atari_400@hotmail.com )
Date Posted: Tue Feb 26 11:53:44 US/Eastern 2002
Message:
Thanks for your help Bruce.


Back to message list Topics List About this forum
Reply to this message