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November 2003

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Subject:
From:
Eddie Rocha <[log in to unmask]>
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Date:
Fri, 14 Nov 2003 11:50:24 -0800
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This could be poor drilled hole wall quality that makes plating the
hole wall hole uniformly a challenge. Severe drilled hole roughness
can result in plating folds with areas of thin copper plating. These
areas can pass electrical tests but after thermal exposures they can
break and cause an open via.

Another possiblity is debris left in the hole after drilling can prevent
proper plating of the hole.

X-sections of the open vias should clearly identify the problem.

-- Thanks,
Eddie Rocha
(408) 978-8992 x 282

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