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How to create custom pads in protel 98

How to create custom pads in protel 98

(OP)
Whats the secret on creating custom pads for a QFN pcb cell? I want a rectagle with one end of the pad full radius.

RE: How to create custom pads in protel 98

When I have made QFN pads, in the library, I have placed a rectangular pad and a round pad together to get the desired pad shape. I give both these overlapping pads the same pad number. I do this for all the pads of the footprint.

When the footprint is placed on the PCB, Protel will assign the proper net name to one pad and not the other (in the 2004 DXP SP2 I use). You have to go through each unassigned pad, double click, and assign it to it's proper net.

I have had QFNs with complex ground pads underneath composed of fills, traces, pads, and vias. With these when they are on the PCB, you double click the footprint, uncheck the "lock prims", go about selecting and assigning nets to all the various pieces, then double click the footprint again and re-check the "lock prims".

Of course, if you change the footprint in the library and update the footprint in the PCB from the library, you have to go through the process again.

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