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December 2009

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Subject:
From:
Dean Stadem <[log in to unmask]>
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Date:
Tue, 1 Dec 2009 19:41:41 -0600
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A small piece of 1/2" wide Kapton tape can be applied over the pad. When
pressed down carefully, no additional solder will be picked up when the
board goes over the wave. The pad will be nice and flat, assuming it is
not HASL. But even the HASL may be flat enough on a pad that size to
accommodate your mechanical hardware.

R. Dean Stadem
Consulting Engineer
Analog Technologies Corp./Lumagine, Inc.
11441 Rupp Drive
Burnsville, MN 55431
(952)894-9228
[log in to unmask]


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of henry rekers
Sent: Tuesday, December 01, 2009 6:28 PM
To: [log in to unmask]
Subject: [TN] Pad that does not solder.

Hi,
 
I have an application where I need to force a pad to not solder (or at
least solder to a consistent thickness) in wave solder.  The pad will
eventually recieve a mechanical connection.  I'm trying to design a land
that will either skip, or solder to a consistent minimum thickness.  The
pad is large about 0.500 by 0.500.  Maybe some sort of a checkerboard,
or grid of vias, etc?  The wave is leadfree with sac solder.
 
Selective soldering has already been ruled out due to other design
constraints, and I'm also pursuing the idea of peelable mask.
 
Any ideas?
 
Thanks.
 
Henry.


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