[sebhc] A question of Gold

Dwight K. Elvey dwight.elvey at amd.com
Wed Apr 28 11:09:57 CDT 2004


>From: "Lee Hart" <leeahart at earthlink.net>
>
>Carroll Waddell wrote:
>> 
>> While looking for H8 card connectors, I came across both a gold and a
>> select gold. Can someone tell me what is the difference?
>
>It is easier (but more expensive) for the manufacturer to gold plate the
>entire terminal. But the only part of the terminal that actually needs
>the gold is the actual contact area. "Selective gold" plating means they
>only gold plate the part of the terminal that actually touches the pin.
>It's generally a better option.
>-- 
>"Never doubt that a small group of committed people can change the
>world. Indeed, it's the only thing that ever has!" -- Margaret Meade
>--
>Lee A. Hart  814 8th Ave N  Sartell MN 56377  leeahart_at_earthlink.net

Hi
 Also, having gold on the part that is soldered has issues
with automated soldering setups. The gold tends to dissolve
into the solder pot and both raises the temperature and
makes the finished solder more brittle. It is interesting
that for years, HP made all of their circuit boards with gold
plate. It made for good looking boards but it may not have been
the best overall surface for soldering parts to. It does
wet with solder quickly when soldering for the first time
but at a cost.
Dwight


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