Is the copper heatsink on the bottom of the HQ304, HQ240, and HQ208 devices grounded? How can I safely ground the device to help dissipate heat?
On the HQ240, the heatsink is 24mm x 24mm; on the HQ208, it is 21mm x 21mm.
On both packages the heatsink is grounded, so there are no problems with connecting the heatsink to the board ground. But because the heatsink is grounded, care must be taken so that the pins on the package do not short to the heatsink.
The HQ304 may not have the heatsink grounded internally--it must be grounded externally.