Wild guess . . . Immersion Silver.
-----Original Message-----
From: TechNet [mailto:[log in to unmask]]On Behalf Of Graham Naisbitt
Sent: Monday, October 15, 2001 6:52 AM
To: [log in to unmask]
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
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