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: Richard Smith
Date posted: Tue Feb 19 8:54:28 US/Eastern 2002
Subject: Specification for PCB Insertion Cycles
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.
Subject: Connector Contact Delamination
Reply Posted by: B.W.Dudley
Organization: Reliability Analysis Center
Date Posted: Tue Feb 26 9:40:46 US/Eastern 2002
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.
Subject: Re: Specification for PCB Insertion Cycles
Reply Posted by: Richard Smith
Date Posted: Tue Feb 26 11:53:44 US/Eastern 2002
Thanks for your help Bruce.