It's a good question, I think you just misunderstood it.

Say I design a board with 6 mil minimum traces,
but I have routed the IC power at 10mils.
Is anyone saying I should accept 20% less than 6mils on those traces?
I don't think so....

                -----Original Message-----
                From:   Howieson, Rick [mailto:[log in to unmask]]

                What part of the minimum value is misunderstood? If the
requirement
                states minimum 10 mils WHY are you making it 11???
                Rick

                >-----Original Message-----
                >From:  Franklin Asbell [SMTP:[log in to unmask]]
                >
                >Keep in mind how that is worded. The requirement say's
"...20% of the
                >minimum value, or less."
                >
                >Now if the artwork require a minimum trace width of let's
say 10 mils, and
                >you make the trace 11 mils, the 11 mils trace is reduce by
21%, would this
                >be rejectable in accordance with A-600? Or would the
minimum value (i.e. 10
                >mils plus or minus the allowable tolerance) be the starting
point to
                >subtract 20%?


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