Protel Hell wrote:

the minimum sm width is 4 mils, anything less becomes a problem

The minimum width depends upon 2 factors:


1) The process of your board vendor. Some vendors may be able to reliably do 4 mils, while others may have a hard time with 10 mils.

2) The length of the narrow part. A 4 mils wide by 20 mils long finger may work, but an 8 mils wide by 1 inch long finger will never survive.

Hamid




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