Drilled Holes in Oblong Pads
Drilling holes in oblong pads requires additional rules to ensure the connectivity of the pad is maintained.
The rules for annular rings of oblong pads are NOT different from round pads, but we allow some exceptions to these rules.
Oblong pads with NPTH holes
- MUST ALWAYS FULLY COMPLY with the standard Annular Ring rules for any given pattern class.
- The recommended Annular Ring for any NPTH hole is 0.30mm (12mil).
Oblong pads with PTH holes
The measurements below are taken from the production TOOLSIZE.
- The smallest side of the oblong pad the OAR must be >= 0.00mm (0mil) (i.e. no breakout is allowed) as below:
- On the longest side of the oblong pad in both directions the OAR must be >= 0.300mm (12mil) (but the hole need not be in the centre of the pad) as below:
The hole may not be positioned in such a way that it could disconnect the pad from the track.