SOT223; Joining pad to tab

Name the poly the same name network connected to that pad has. Via naming button, not via info window.

I've tried this, but it does not work. It does work with other components, but not this type for some reason.

There seems to be only 3 connections allowed on this 4 connection component. I would rather there be 4, even if it means a messy schematic, as this is mainly a board design program. I would rather have to link the tab on the schematic manually to one of the pins to match the component needed.

Can I edit the component to add this?

Which voltage regulator? Tell me how it is called and in what library it is, I'll investigate

Part no. is LD117AS12TR and is a SOT223 in library V-reg.

This one only allows the tab to be connected, but doesn't like the centre leg being attached to the tab. I'm actually using an LM1117 adj one and the datasheet shows this as the tab is the same as the centre leg.

The other problem I had was another SOT223, part no. NDT2995 and is in the zetex library. This is the one I can't attach anything to the tab. Again datasheet shows the tab is the same as the centre leg.

Both give an overlap error if I try.

Thank you for your time investigating it. If there is an alternative part I can replace these with that will allow a neat board using the sot223 then I might be able to do it this way.

I've found someone else had this problem 6 years ago !!! Is this still unresolved ? - How to avoid isolation around a SOT223 collector tab?

You are right, the schematic symbol should have a pin for each pin on the device. You can edit the device to add the pin. You could check the 78L05F device in the Linear library to see how they did it there in the SOT89, but note they connected the 2 pins in the device package.

The LD117AS12TR device in the V-Reg library has an unconnected pad, you can just add a pin to the symbol and connect it in the device window, or create a new symbol with 4 pins.

You are right, the schematic symbol should have a pin for each pin on the device. You can edit the device to add the pin. You could check the 78L05F device in the Linear library to see how they did it there in the SOT89, but note they connected the 2 pins in the device package.

The LD117AS12TR device in the V-Reg library has an unconnected pad, you can just add a pin to the symbol and connect it in the device window, or create a new symbol with 4 pins.

Thank you for your help. I have finally solved it !

As you say, I've edited the part after finding it in the library and added a pin which was the easy part.  What I had to do then was to "connect" it which was a little complicated and took me a while to find out how.  I saw a "Connect" tab in the lower right window but I've forgotten how I got there. Anyway, this shows you the pins and pad connections. I got confused with the centre panel, as anything in there got added to the top right panel, sometimes with a link symbol, and sometimes a broken link symbol. I'm sure I can find out why eventually, but I did manage to get 4 pins connected to 4 pads, and got a green tick. After saving, this was easy to replace the part I had  - and gave me that extra connection on the schematic. When this was connected, I got an airwire on the board which was correct. Clicking ratsnest filled it in as my ground around the pad with no gaps!

So happy.

One wrinkle is the pin is given a name which I couldn't see a way to edit that at the time, but maybe it is easy to re-name it before I placed it.