Footprint creation in Allegro PCB Editor

For odd shaped drill, it is not really a drill since a physical drill is circular. To create what your after one would be looking at a routing bit so as to route out any shape within a pad or copper area.

For the odd shape pad, create a Shape pad of a suitable size in the symbol editor first. Then create a padstack based on this shape symbol. Back in the pcb editor after the footprint is placed you can add a "NC Route path" under Board Geometry with a line to define the area that needs to be routed out within the pad.

Since this will be done with a physical router bit one would have to check in advance that the pad is going to be large enough so that it could be actually routed out and not simply blown away by the router bit. It would probably be ideal to verify the minimum size router bit that the PCB House can use too.

Its not possible to embed the route path in the padstack to the best of my knowledge so you would be looking at a two step process to make this suggestion work.

Best regards.

We use a USB-C connector (TE 2295018-2) that requires an L-shaped slot adjacent to the signal pins.

Two overlapping slot padstacks to form the slot results in Excellon drill exports without any problems for our fab houses.