PCB’s DRC precision
Circular mil (cmils) is used for gerber (0.01 mil). Hence, PCB’s DRC precision should be 0.000254 mm.
DRC should be able to get mil units right. It’s for mm that 0.000254 mm should be added to the DRC rule while exporting to gerber.
What are some references for making surface mount pads and footprints?
Known components used by the opensource hardware community:
- NCP1117 – The opensource prototype board Arduino uses the LDO from ON Semiconductor.