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Exposed pad, associated copper, thermal pads and PCB heatsinks

Question asked by elima on Jan 3, 2018
Latest reply on Jan 9, 2018 by rajesh_chandrasekar

I am a new to PCB design and some basics are still not clear to me. In my new design I am using a component that has an exposed pad. The component is smart high-side Mosfet. The exposed pad would be connected to a copper heatsink, perhaps.

The company that manufactures the component provides also the PCB footprint. Checking the provided footprint, I noticed that the exposed pad is connected to two copper pours.

Datasheet of the component: PCB footprint p.52

PCB footprint(under boards): BTS7008-2EPA - Infineon Technologies


Now to my questions:

1. As far as I understood, the terminals are part of the copper, how adding associated copper pours changes anything? I am probably understanding something wrong.

2. For manual soldering, I suppose that I would need to add VIAs so that I will be able to solder the component from the other side, right?

3. When are thermal pads used and what is the difference between for example the associated copper?


Any links/videos that explain the topic are much appreciated. I have tried myself to find answers to my question without much of luck.