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May 2001

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Subject:
From:
Mason Hu <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Wed, 16 May 2001 17:40:34 -0500
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In some cases, thinner is better.  For example, when you look at solder
joint reliability, the thinner the board, the more reliable the joint is.
Why?  Because thinner board can flex and not constraining the solder joint
as much as the thicker board.

However, the laminate is stretching the copper barrel in the case of PTH
symmtrically - no flexing.  The more copper on the barrel means more
material bearing the load.

You are right about not relying solely on intuition.  That's why we also
run experiments, e.g. thermal cycling, to verify these theories.

Mason

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