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January 2009

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Subject:
From:
Kevin Glidden <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Kevin Glidden <[log in to unmask]>
Date:
Tue, 27 Jan 2009 08:35:59 -0500
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Morning all,
 
Question today about SnPbAg solder.  We have always used Sn63Pb37 solder
alloy for all products, with exception of some high temp solders for special
cases.  The lion's share of our PCBs are ImAg finish, 5 to 12 micro-inches,
per IPC-4553.  In reading about SnPbAg solder, it appears to be recommended
for use on SMT components with thin (?) silver finishes.  This is to prevent
the dissolution of the component lead into the solder joint.  Drawbacks
appear to be only that the joint is not as shiny and reduced mobility of the
solder.  Is it also considered good practive to use an SnPbAg alloy for
immersion silver PCBs for the same reasons?  Any tech articles available on
this?
 
Thanks (again!)
 
Kevin Glidden
Manufacturing Engineer
Luminescent Systems Inc.

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