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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