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July 2000

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Subject:
From:
Graham Collins <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Tue, 25 Jul 2000 07:25:57 -0400
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Hi All
Today's question concerns capacitors:
Going through the data sheets on AVX's web site concerning capacitors (X7R dielectric in particular), I find a note that 0402, 0504, and 0603 are for reflow soldering only.  Also, 1808 and up are recommended for reflow soldering only.  I understand the reasoning behind reflow soldering 1808's and larger, but what's with the small ones?  A quick check of the Vishay site did not turn up the same process note.

The only theory I have at this point is this: if wave soldering 0603s,  you may end up with a big solder fillet, perhaps too large to allow stress relaxing / creep in the solder joint.  Good theory, or is there a better reason out there?

Thanks and have a good day!

regards

Graham Collins
Process Engineer, Litton Systems Canada, Atlantic Facility
(902) 873-2000 ext 6215

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