What this CoolMOS N-channel brings to a 650 V rail
It is built for hard-switching topologies — PFC boost stages, LLC resonant converters, flyback and two-switch forward supplies — where the 125 mOhm Rds(on) keeps conduction losses manageable without sacrificing switching speed. The 70 nC gate charge at 10 V drive is a middle-of-pack figure for this Rdson class; expect a gate-driver capable of sourcing and sinking a few amps to hit the switching edges cleanly.
The 208 W power dissipation at the case (Tc) is a package limit; real-world derating depends on the heatsink and airflow. The PG-TO262-3 footprint matches standard TO-262 hole patterns — verify lead form before populating an existing board layout.