2. Why use compliant pins in connector designs
First, I should explain that a compliant pin is one that when inserted into a plated-through hole, creates a spring force against the barrel of the hole that creates a gas-tight joint that is just as good electrically as a solder joint. It has the additional advantage of not exposing the printed circuit board to a heat cycle, especially important on high layer count backplanes.
http://www.connectortips.com/use-compliant-pins-connector-designs/
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