The AD8337 has an exposed heatsink pad on the underside of the package. However, the datasheet doesn't say anything about how to connect this on the PCB. Should I connect it to GND, VSS, or what? What are the internal connections for this pad?
There are no internal connections to the pad. We received inquires such as yours as to whether the pad could be connected to various nodes so as to use a convenient piece of etch. We thought at the time the spacing was pretty tight so people wanted to use other circuit nodes to landing pad.
The part does need the copper for thermal management however, but not much is needed. People sometimes use a thermal scanner to get locate the highest heat sources.
I hope this helps,
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