Check out the pin numbering on this:
So, if you want to do it universal.. stick to 1,2,3 for the small ones and 4 for the large tab for a SOT-223 housing.
The symbol then also needs 4 pins.
Don’t use ‘0’.
If you’ve got a device in that housing that only has got 3 electrical pins (symbol then has got 3 pins only) and you know what you’re doing you can also just use 3 pin numbers on the footprint (which means 2 pins will have the same number) - caveat then, you have to have a special footprint for this device.
Or you put 2 pins in the symbol with different numbers (one has to have invisible numbering then) over each other, so they get connected at the same time to the same net (that solution is not so ‘clean’), so the footprint can have 4 numbers - caveat, hard to modify symbol if more than 10 pins involved stacked on top of each other.
Many ways lead to Rome…
Personally I’d do either the first or second variant.. the third is not easy to spot/handle once implemented.
There was a post a couple of days back about this kind of thing though, which was proposing a way to have pin-linking-options in the symbol-editor.. one sec..
Read through the thread and if possible log/register on launchpad to support the proposal to get a feature like this implemented - click on “this bug affects me” too at top left 