Hi Graham! Here is a pdf of one of our reports:
(See attached file: 00057.pdf)
Dave
Graham Naisbitt <[log in to unmask]>@ipc.org> on 10/16/2001
11:37:14 AM
Please respond to "TechNet E-Mail Forum." <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
To: [log in to unmask]
cc:
Subject: Re: [TN] Lead Free Surface finishes
For Dave Hillman
Dave thanks for that input - it is very useful.
As I may have explained, we are doing this work as part of a paper we are
to
present at a conference in Singapore. Might we be able to see a copy of
your
work and to reference it in ours?
Regards, Graham Naisbitt
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-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of
[log in to unmask]
Sent: Tuesday, October 16, 2001 04:58
To: [log in to unmask]
Subject: Re: [TN] Lead Free Surface finishes
Hi Graham! Let me propose a different angle to your request: spend the
money now during your testing to acquire an understanding on how the
different surface finishes influence/interact with the testing protocol
before settling on "one" finish. Rockwell Collins has spent the last 2
years testing finishes and gathering industry data on the alternative
surface finishes. We have "qualified" several finishes - some work better
in specific use applications than others. However, I also believe that we
will eventually settle on just a couple (yep, you guessed it - immersion
silver and immersion tin) as the main choices for assembly designs. One
finish doesn't fit all as HASL did - if you limit your testing now you may
end up doing additional testing in the future. Good Luck.
Dave Hillman
Rockwell Collins
[log in to unmask]
Graham Naisbitt <[log in to unmask]>@ipc.org> on 10/15/2001
05:52:10 AM
Please respond to "TechNet E-Mail Forum." <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
To: [log in to unmask]
cc:
Subject: [TN] Lead Free Surface finishes
Techies and (I guess - Leadies?)
We are about to carry out some reliability test work, examining the
influences of electro-chemical reactions using SIR techniques.
The manufacturing process that will be employed involves lead-free
soldering materials, water based fluxes and water based conformal
coatings. The methodology we shall employ shall be as drafted in a new IEC
draft spec 6-1189.
The coupon we will use is intended to model mixed technology as closely as
possible. We include through-hole connectors, J lead SOIC's, BGA 225, SMT
Capacitors and QFP 160.
We will use an LPIM resist and were going to examine 4 different surface
finishes:
NiAu (ENIG)
ImSn - Immersion Tin
ImAg - Immersion Silver
OSP
However, and to get to the question: We can't afford all these
permutations so, we shall select only one surface finish. Can you folks
advise the most popular surface finish that is likely to be used for
lead-free processing?
Please, we would REALLY like a simple answer rather than to open a huge
dialogue - 'cos we have to get the testing done by Mid November and we
have yet to have the coupons made!!
Awaiting your replies with interest.
Regards, Graham Naisbitt
[log in to unmask]
www.concoat.co.uk
For instant access to Product Data Sheets register on the Tech-Shot area
of http://www.concoat.co.uk
Concoat Limited
Alasan House, Albany Park
CAMBERLEY GU16 7PH UK
Phone: +44 (0)1276 691100
Fax: +44 (0)1276 691227
Mobile: +44 (0)79 6858 2121
Attention: This message is for the named person's use only. It may contain
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confidentiality or privilege is waived or lost by any mistransmission. If
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notify the sender. You must not, directly or indirectly, use, disclose,
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intended recipient. Concoat Ltd and any of its subsidiaries each reserve
the right to monitor all e-mail communications through its networks.
Any views expressed in this message are those of the individual sender,
except where the message states otherwise and the sender is authorised to
state them to be the views of Concoat Ltd or one of its subsidiaries.
Although this message has been scanned for known viruses and inappropriate
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Thank You - Concoat Ltd
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