Answer:
The MAX3280EAUK+T device is a 5 pin SOT package (package code U5+2) type without exposed pad. Heat dissipation is through the leads. For the U5+2 package, the die attach paddle is also connected to Pin 2 which is GND, therefore the primary heat dissipation path is through Pin 2 to the ground plane. The MAX3280E is a low power consumption device, and heat dissipation should not be an issue in most applications.