# astrimid - quick question about thermal pad. I'...

Channel: #support
Source: https://discord.com/channels/1233487248129921135/1529226600455864430
Started: 2026-07-21T20:40:34.014000+00:00
Last activity: 2026-07-21T20:56:52.872000+00:00

## astrimid — 2026-07-21T20:40:33.205000+00:00

quick question about thermal pad. I've tried to define a qfn20 package for chip, but in PCB representation I don't the the thermal pad. There's also no corner gnd pin. Am I doing something wrong or is it a missing feature?
Attachment: image.png — https://community.tscircuit.com/media/1529226599759614012
Attachment: 28_pin_MLP_integrated_circuit.png — https://community.tscircuit.com/media/1529226600137228389

## astrimid — 2026-07-21T20:55:58.714000+00:00

Thinking about it more `<chip` footprint only implicitly define the pads configuration, as it represents a component mounted to PCB. So it rather defines chip pins. While the pcb pads can have a different footprint configuration.

I couldn't find a way to separate chip lead definition from pcb footprint definition: https://electronics.stackexchange.com/questions/464291/pcb-pads-vs-components-footprints-in-pcb-design

## Rishabh — 2026-07-21T20:56:13.719000+00:00

use this footprint string `qfn20_thermalpad`

## Rishabh — 2026-07-21T20:56:36.608000+00:00

[attachment]
Attachment: image.png — https://community.tscircuit.com/media/1529230640699150486
Attachment: image.png — https://community.tscircuit.com/media/1529230641022107808

## astrimid — 2026-07-21T20:56:52.872000+00:00

That's it!