Sherman,
First thing to do is to see if you have electrical connection to all the fingers in the circuit. That is to say a buss bar or internal bussing that will allow electroplating. I'm guessing these were fab'd outside. If so, the final routing will have broken connection across the fingers. If not then stripping the Ni/Au and plating up the copper may be your best recourse. I'm not sure about how 2 mils of copper plating is going to work electrically for you amongst other things.
Electroless plating may not work as the gold plating must be hard gold on the fingers. Immersion gold isn't and you can't plate up to the gold thickness you require. Just my 2 cents.
Mike Doty
P.E.
-----Original Message-----
From: Sherman Banks [mailto:[log in to unmask]]
Sent: Tuesday, May 01, 2001 6:09 PM
To: [log in to unmask]
Subject: [TN] Plating up Gold Tabs
Hello everyone,
We have an interesting situation. We have product that is too thin to meet
our card edge connector specification by about 2 mils. We need to build up
these gold tabs by at least one mil (0.001") on each side of the board. The
tabs are now approx one ounce copper with 200 micro inches of nickel and 30
micro inches of gold. Thoughts were to build up gold with electroless, or
strip gold/nickel, plate up copper, then replate nickel and gold. Has anyone
ever come across this sort of situation before? Any ideas? Note: Some of
this product is on panel format, some single boards, and some loaded boards.
Thanks in Advance
Regards,
Sherman Banks
Finisar Corp.
1308 Moffett Park Drive
Sunnyvale, CA 94089
408/542-4240
[log in to unmask]
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