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.