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September 2006

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Subject:
From:
Phil Nutting <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Phil Nutting <[log in to unmask]>
Date:
Thu, 28 Sep 2006 12:20:52 -0400
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Has anybody defined recommended maximum copper thickness (weight) with
specific size SMT components?
 
For example; 2 oz. copper max with 0603 resistors and caps.
 
My thoughts process here is I know that with thicker copper there is
more undercut by the etchant.  There must be a point of diminishing
returns for pad size to maintain good manufacturing capabilities, not to
mention the remote possibility of rework.
 
Some of our "power electronics" boards may be specified as 4 oz. copper
for the large power components, but this might be an issue for the small
control circuit components like 0603 foot prints.
 
Thanks in advance.
 
Phil Nutting

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