The 95 mOhm on-resistance at 10 V Vgs and 11.8 A is the conduction loss anchor.
Through-hole TO-220-3 — mounting and thermal path
Housed in a standard TO-220-3 (PG-TO220-3) through-hole package, this part bolts to a heatsink via the metal tab, which is electrically common with the drain.
If your line needs a known-good cross, the CoolMOS C7 family includes several 650 V TO-220 devices with similar Rds(on) and gate charge profiles — confirm pin compatibility and thermal specs against your operating point before substituting.