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1996

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Subject:
Re: Non-Functional Pads
From:
"Greg Bartlett" <[log in to unmask]>
Date:
6 Feb 1996 08:38:46 -0500
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                      RE>>Non-Functional Pads                      2/6/96

We currently do not remove non-functional inner layer pads, but we had an older design in which they were removed.  Interesting to note that we had a significantly higher failure rate (due to barrel cracking) on those without the non-functional pads.

I've heard a couple of mechanical engineers suggest that you should delete non-functional pads on the *outer* layers to reduce stresses on the barrels of vias.  Anybody have any experience with this?

Greg Bartlett
Mercury Computer Systems
Chelmsford, MA

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