Rick,

A 62/36/2 silver solder has a plastic state when transitioning from a solid
to a liquid of a few degrees (between 182'C to 187'C) unlike 63/37 of 183'C.
This can give enough surface tension on either side of the component to
prevent tomb stoning from occurring.

Simon.

-----Original Message-----
From: Rick Thompson [mailto:[log in to unmask]]
Sent: Wednesday, 30 October 2002 11:55 AM
To: [log in to unmask]
Subject: Re: [TN] Round Pads for 0402 Parts?


Steve,

Any feedback is appreciated.  Are you saying that you've been able to
document a reduction in tombstoning on 0402's using 2% silver solder paste?
Hadn't heard of that one. Anybody else using it with these results?

Rick Thompson


===== Original Message from [log in to unmask] (TechNet E-Mail Forum.) at
10/29/02 4:37 pm
>Hi Rick!
>
>I'll get back to you tomorrow with some pad geometries that have worked
well
>here...don't trust my memory (getting senile, ya' know...hehehe)
>
>Have you tried using a 2% silver solder paste yet? I'd recommend it very
>highly!!
>Believe me, it makes a HUGE difference!!!!
>
>-Steve Gregory-
>
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Rick Thompson

Sr. SMT Process Engineer
SMTEK International, Inc.
+1 (805) 532-2800
[log in to unmask]

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