Hello Jack,

We've used it on a couple of designs.
Seems very good, low cost alternative to ENIG.
Nice, flat and even finish, good for fine pitch.
We didn't spec thickness. I believe that, being a chemical process, the
thickness is somewhat molecular.
Must be handled carefully to avoid tarnishing, but we have a board just
sitting in an office for the last 6 months, shrink wrapped in plastic with
no evidence of tarnishing.

regards,

Phil Dutton C.I.D.
Senior CAD Technician
IPC Certified Interconnect Designer

-----Original Message-----
From: Jack C. Olson [mailto:[log in to unmask]]
Sent: Wednesday, 3 April 2002 22:57
To: [log in to unmask]
Subject: [DC] Immersion Silver


Have any of you tried Immersion Silver yet?
We just had our first design coated with silver,
I've read plenty of articles and never heard
anything bad about it (and before you old-timers
say it, they've pretty much solved the "whiskers
/dendrites" problem I think)

...but what I heven't seen is a typical fab note
or the recommended thickness tolerance.

Informal Poll:
If you are using silver as an alternative finish,
what are you calling out for the tolerance?

Jack (the "willing to try new things" guy)

p.s. the new issue of "The Board Authority"
by Circuitree has some great articles about
this, but they aren't letting people download
back issues anymore! Does anyone have
old copies of "The Board Authority" on disk?

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