The point NOW is not what the past intent is/was nor should the question be,
does it met ome number in a spec but rather "is it a reliability issue, - it
isn't"!
Exposed copper on the side of traces has always been acceptable including the
old "mil spec". New "High-technology" boards today are being used & shipped
with NO reliability issue.
Dave Gendreau
President & CEO
DMG Engineering
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www.DMGengineering.com