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43:39 1996 |
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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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