The STD4NK100Z: The 1000 V drain-source breakdown voltage suits offline flyback, PFC, and auxiliary supply stages.
AEC-Q101 — built for automotive environments
The DPAK (TO-252) package with an exposed tab — the drain connection — needs a proper copper area on the PCB to get the 90 W power dissipation rating.
On-resistance and gate drive — the switching trade-off
Rds(on) is 6.8 Ohm max at 1.1 A with 10 V gate drive.
It's ROHS3 compliant.
