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March 2000

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Sat, 25 Mar 2000 10:05:36 -0800
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David Spencer wrote:

> Background
> I have been working on, or should I say
> "I have been worked over by..", the
> requirements of GR-78-CORE. Requirement
> R6-8 states, "Silver shall not be used
> as a conductor or contact finish. []
> Tin shall not be used as a conductor or
> contact finish unless subjected to an
> approved reflow process."
>
> During our prototype phase, we have used
> immersion gold. Our Mfg. Eng. wants to
> move to immersion silver or white tin,
> because the gold is expensive and can have
> solderability/reliability problems related
> to the nickel plating under the gold flash.
>
> Questions
> Does anyone have a ruling on the use of
> silver or white tin immersion finishes from
> any of the RBOC's as it relates to the
> requirements of GR-78-CORE?
>
> Are there any documented tests of these
> finishes available, i.e. accelerated aging,
> solderability, insulation resistance, etc ?
>
> Does anyone have experience with either of
> these finishes in the hygroscopic dust/gaseous
> contamination test suite from GR-63-CORE?
>
> Thanks for your help!
> Dave Spencer

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