Hi, I’m trying to create a symbol for a transistor MJD31CG. It consists of 4 pin. 2 of them (2,4) are pins of a collector. I got a symbol like this
How can I assign 2 pins to 1? When I try to assign a TO-252AA footprint, PCBnew generates an error while loading the netlist.
There are a few options.
With most dpak packages, you can simply give the slug (tab) the same number as the pin it is connected to. (This is how it is done in the official lib. TO-252-3_TabPin2 connects the tab to the middle pin which is what you want here.)
Or you can add a second pin to the symbol. (either visible and next to the other pin or invisible and on top of the other pin. Depends on your preference) There is however no fitting footprint for this in the official lib. (TO-252-4 should be called TO-252-5)
Hi Rene. Thank you for your response. It’s been useful. 
I got corrected. (https://github.com/KiCad/kicad-footprints/issues/800) If you want to make all 4 pins visible in the symbol then you can use the footprint TO-252-3_TabPin4.
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