Tokmas CID9N65E3 rocks!
It is CRAZY how efficient this GaN FET is in TO-252 (DPAK) package. It generates 5W @ 28 MHz with 13.8V at drain without even warming up! Close to 4W @ 50 MHz with 12.0V at drain. 5W+ @ 50 MHz with 13.8V at drain. 11W+ @ 50 MHz with 20V at drain.
It even produces ~3W at 70 MHz with 13V at drain - w00t!
Less than 39 degrees!
Datasheet excerpt:
The full datasheet is available here.
Here is the 3D render for a PCB I made for testing this part:
The PCB design is available @ https://github.com/kholia/HF-PA-v10/tree/master/GSD-Hacks-v4-SMD (non-commercial use only).
Update: I guess there is NO reason to consider Toshiba 2SK3476 (which actually is NRND now) these days.
NB: Our 'workhorse' gate driver for this and the recent experiments has been the Onsemi's NCP81074ADR2G in the friendly SOIC-8 package.