My company makes 10G Transceivers. We usually use a "flash" immersion
gold.

-----Original Message-----
From: DesignerCouncil [mailto:[log in to unmask]] On Behalf Of Bob
Walker
Sent: Friday, June 23, 2006 7:41 AM
To: [log in to unmask]
Subject: [DC] PCB surface finish / EMI gasket

Hi All,

Does anyone have any experience with what type of PCB surface finish to
use
with an EMI gasket? Or can anyone point me in the direction of any good
websites  where I can learn what I need to know.....I'm not a materials
kind of guy.

There is a 10G transceiver on my PCB design that contains an EMI
elastomeric
gasket that is made of conductive rubber and will come in  contact with
a
portion of the conductive surface of the PCB. Because of the RoHS
directive,
I've been leaning towards using an Immersion Silver finish for  various
reasons.
But, I have a concern about the potential tarnishing  effects of the
finish
over time. Will the seal between the silver finish and the  gasket
degrade over
time? Is there anything else I'm missing with regards to  using an ImAg
finish
with an EMI gasket?

TIA for any feedback....

Regards,
Bob Walker
CebaTech Inc.
[log in to unmask] (mailto:[log in to unmask])
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