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March 2002

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Mon, 11 Mar 2002 13:48:46 EST
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Peter,

Removing inner pads and using the newly found area is certain death.  I have
a fellow FAE that does a seminar on the error of blindly removing pads to
gain trace area.  Less than .001 average wall thickness on a conventional PTH
in a Military PWB is death.  Aspect ratio's of 7/1 are much much more
reliable than this pad removal scheme and allowing less than the .001 PTH
wall thickness.  The PTH thickness plays with aspect ratio; to the extent
that .0007 will work for MicroVia, but the Z axis is from .002 to .005.  That
is a big difference.  Finally in reference to pad deletion your better off
making the entire board tougher to fab with smaller pads than to arbitrarily
delete and bump traces.

Boston Brad
781 858 0783

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