Hi Linda,

If you want to be safe then I would recommend the Electroless Nickel
and Immersion Gold finish. It has been around for a long time and is
generally considered to be the best quality finish available.

Specify 3-5 microns El/Nickel and 0.05-0.15 microns immersion gold.
(25 microns = 1 thou")

Ask for a quote as standard HASL as well so you can see the added cost
of this finish. On an expensive board, it should not be too
significant.

Regards
Paul Gould
Teknacron Circuits Ltd
UK
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-----Original Message-----
From: (No Name Available) <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: 02 November 1998 01:31
Subject: [TN] Fine Pitch info


>Hi everyone,
>For increasing the placement of fine pitch devices I have heard about
gold
>finish, tin and silver.  So tell me from everyone's experience which
do I want
>to use for fine pitch PC boards?  We have an expensive board that we
have to
>process and I can make the changes this week.  After that I am stuck
with my
>decision.  Since I don't know anything other than tin/lead I am in a
bit of a
>pinch here.  Of course I know who can give me the answers and that is
you
>technetters.
>
>Thanks for the help in advance.
>
>Linda
>[log in to unmask]

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