----- Original Message -----
Sent: Tuesday, October 29, 2002 7:19
PM
Subject: Re: [TN] Round Pads for 0402
Parts?
Hi Rick!
Absolutley!!! SMT Magazine just had
an article talking about "Phased Reflow Soldering". Basically, you have a
longer plastic phase with a 2% silver solder that allows the flux to work
more, and allow the wetting to equalize before becoming completely
liquidous, which reduces tombstones...
The article talks about
different mesh sizes of the solder powder too, but I found here, with boards
that have had tombstoning with 0402's in the past, when I switched to a 2%
silver paste, problem was solved...completely...I'm serious.
You will
be amazed...
-Steve Gregory-
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
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