650 V CoolMOS — the PFC and flyback workhorse
The 20.7 A continuous drain rating at 25°C case temperature gives you headroom above the typical 10-15 A operating point in a 1-2 kW supply, and the 208 W max dissipation tells you the package can shed the heat if you bolt it to a decent heatsink.
114 nC gate charge — sizing the driver
Gate charge Qg is 114 nC at 10 V. Push the frequency to 200 kHz and the driver's thermal budget and the bootstrap capacitor sizing become the next thing to check.
The 150°C Tj(max) is the hard thermal limit — the Rds(on) roughly doubles from 25°C to 150°C, so the conduction loss at the hot end is the real derating constraint.
Active lifecycle — no obsolescence clock ticking
No last-time-buy window to manage, no forced redesign for a replacement. For a production BOM line this means you can commit the quantity without the urgency of an EOL notice. The CoolMOS C3 series has been a staple in power supplies for years; the active status and the through-hole TO-247 package mean this part is still the go-to for designs that need a 650 V, 20 A class switch in a serviceable package.