Electronics Forum: cte potato (Page 1 of 1)

BGA crack and strain gauge measurement

Electronics Forum | Mon Nov 27 08:05:50 EST 2006 | davef

There is no standard for a strain gage measurement of allowable deflection of a board or a fixture. It's possible that your fixture is causing the BGA cracking that you see. What protion of the BGA is cracking? If it is the solder connection, sear

BGA rework: Coplanarity of Xilinx before and after reflow.

Electronics Forum | Mon May 16 22:59:40 EDT 2005 | davef

We believe your problem is caused by the mismatch in CTE of the material ised in your BGA. In fact, this "potato chipping" [where the corners curl-up] is present in all BGA. The issue is the matter of degree. [Mismatching CTE is how old thermostats

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