Terry Davey asked:

>Does anyone out there have experience/knowledge of mating gold-plate edge
>contacts (on SIMMS - so dry contacts) with tinned connectors. Is it a no-no
>from a long-term reliability point of view?

Dissimilar metals is a no-no, and you would have a Galvanic couple with
both tin and lead much more anodic. In the presence of humidity you would
certainly see high resistance develop.

>We have a first source with tinned edge contacts (matching the connector) and
>are lokking at a gold-plate second source.

Tin-lead to tin-lead (with latching and sufficiently high contact normal
forces) would be more reliable than using dissimilar metals. Gold-gold is
yet more reliable over the long term.

There is an article on the AMP web page about this, I think - try
http://www.amp.com/

regards,

Jerry Cupples
Interphase Corporation
Dallas, TX
http://www.iphase.com