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April 2005

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From:
"Mcmaster, Michael" <[log in to unmask]>
Date:
Tue, 5 Apr 2005 09:47:06 -0700
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TechNet E-Mail Forum <[log in to unmask]>, "Stephen M. Vargas" <[log in to unmask]>
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TechNet E-Mail Forum <[log in to unmask]>, "Mcmaster, Michael" <[log in to unmask]>
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Steve

I can't tell you about adhesion problems because we've never evaluated
putting SM over silver.  The immersion silver surface finishes I'm aware of
have a co-deposited solderability preservative added to them.  This
preservative is thermally sensitive and can be destroyed by operations like
soldermask curing.

The boards are likely still solderable now, but you probably want to
assemble them fairly quickly.  I don't recommend storing any unused boards
for an extended period.

-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Stephen M. Vargas
Sent: Friday, April 01, 2005 5:42 AM
To: [log in to unmask]
Subject: [TN] Immersion Silver

Good Day All:

    A question arose at our factory regarding immersion silver surface
finish. We received boards where the solder masking was applied after the
immersion silver was applied to the PWB. Are there potential solder mask
adhesion issues with this? Should the solder mask be applied prior to
adding the surface finish? Any insight would be appreciated. Thanks.

Regards,
Steve Vargas

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