As the circuitry width become finer (3/3 mil, 2.5/2.5mil), I would like to know
whether the line width tolerance got new specification or not.
For PCB, the general IPC standard is 20% of circuitry width.  Let's say
circuitry width 6mil got +30um tolerance.  If circuitry width 3mil, do we still
use 20% of circuitry width as the specification.  Does IPC have the new
specification for fine lines?  Or from the PCB design point of view, what should
be the general tolerance for 3/3mil and 2.5/2.5mil?

Wish your helpful information!

Best regards!
Li Juan

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