Re: gEDA-user: 0805 geometry, was: Script for converting mm to hundredths of thou

[DJ Delorie <dj@xxxxxxxxxxx>]

Clearance is the difference in widths of the copper pad and the mask
opening.  I.e. it's twice the clearance gap.

Mask is an absolute width, not related to the copper size.

The CAPC*, RESC*, and INDC* footprints are the ones you should be
using for "standard" 0805 etc footprints; those are based on (IDC?
JEDEC?) published standards for such things.  RESC2012N is the default
0805 for resistors; it's different than CAPC2012N for capacitors, etc,
and slightly different than the "0805" footprint.

Most fabs want a 3 mil (75um) gap between copper and soldermask.  For
a 900um copper, that means a 1050um minimum mask.


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