On 20 May 2011 05:30, Dave Tweed wrote: > Jim -- > >> The parts I'm talking about here are the "SEM" series connectors from >> Samtec. > > This is a board-to-board connector, mating with the "TEM" connector serie= s. > When mated, the TEM wraps completely around the SEM. Is it possible that > differential expansion/contraction between the two boards is simply apply= ing > too much force to the body of the SEM during the temperature cycling? > > When using direct board-to-board connectors, it is generally a good idea = to > use them between boards that are of a similar size, mounted parallel to e= ach > other using the same anchor points. This minimizes differential movement. > > If this is not possible, then the next best alternative is to make sure t= he > boards are solidly anchored to each other (or to the chassis) near where = the > connector is, and thermal expansion/contraction is allowed to occur only = at > the far edge of each board. > > -- Dave Tweed > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > Have you considered gluing the connector in position prior to soldering? RP --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .