ENIG, or electroless nickel/immersion gold and immersion silver are
compatable finishes for "Rohs" lead free soldering, but so is OSP (organic
solderability preservative). There's even a lead free HASL now.

The problem lies in that ENIG has the better shelf life and planarity than
the immersion Silver, but with Silver, components solder a lot better than
ENIG at the higher temps.

At least that's been what I've heard so far.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dave Seymour
Sent: Monday, August 14, 2006 1:33 PM
To: [log in to unmask]
Subject: [TN] Immerison Au vs Immersion Ag

We are having a little talk about surface finish for RoHS compliance.

We have been doing Immersion Gold for 10+ years and are starting to switch
to Immersion Silver because some feel that Silver is a better finish for
RoHS compliance.

I can't find anything that says one can not be compliant with Immersion Gold
and I'm trying to figure out why the surface finish should change at all.

Could someone point to some articles, opinions or sources that might help
resolve the issue?

I'm out doing some web looking now.

Thanks
Dave



--
Dave Seymour, CID+
Catapult Communications Inc.
800 Perimeter Park Dr, Suite A
Morrisville, NC 27560

Direct: (919)653-4249
Main: (919)653-4180
Fax: (919)653-4297

[log in to unmask]

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