I agree, and the problem with being bitten by one or other, may have nothing
to do with they type of finish, but by the quality of the vendor supplying
the finish to the fab houses, and also just plain machine/manufacturing
errors. In our field, manufacturing errors happen from time to time for no
specific reason, s.. Happens, but obviously, that's not an answer the bosses
like. We've decided to stick with ENIG here unless a customer asks
otherwise. That's in part to we haven't seen any main issues with it, and
all the fab houses we use have ENIG, but not all have Iag, so they have a
better process for ENIG as well. But again, that's our choice and preference
for the circumstances. Until there's a clear cut answer, which just may be
never, we're sticking with it.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Wenger, George M.
Sent: Monday, August 14, 2006 6:35 PM
To: [log in to unmask]
Subject: Re: [TN] Immerison Au vs Immersion Ag
The best advice anyone can give you concerning the choice between IAu and
IAg would be to do your homework and make an "informed decision".
Do not believe everything you hear from someone who has a vested interest in
selling you something (i.e., a company selling a particular surface finish).
Talk to real users of surface finish, read all the published literature you
can get your hands on, talk to your board fabricators and find out what
surface finishes they have and why they prefer one over another and above
all do a comparative evaluation and evaluate the surface finishes for your
particular situation.
There is lots of truth to the old quote "Once bitten twice shy".
Those who have been bitten by an ENIG problem will have little positive to
say about ENIG and the same is true for those who have been bitten by IAg.
That doesn't by itself mean that IAg is a better surface finish than ENIG.
However, I also think that there are more users in the industry that have
been bitten by ENIG than there are who have been bitten by IAg. Another
good source of knowledge is to talk to failure analysis laboratories to find
out the kinds of surface finish problems they have been working on.
Regards,
George
George M. Wenger, Andrew Corporation
Reliability / FMA Engineer
Base Station & Subsystems Group
40 Technology Drive, Warren, NJ 07059
(908) 546-4531 [log in to unmask]
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Chad Renando
Sent: Monday, August 14, 2006 5:55 PM
To: [log in to unmask]
Subject: Re: [TN] Immerison Au vs Immersion Ag
I am hearing a lot of discussion about reliability and compatibility.
From
the sounds of it, it seems to be a wash. If that is the case, from a
commodity perspective, I would think you would get a cheaper price for
silver, so if shelf life is not an issue, why not go with that?
Chad
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Dave Seymour
Sent: Tuesday, 15 August 2006 3:33 AM
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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