650 V, 12 A N-channel in the full-pack TO-220FP
The STF18N65M2: Housed in the TO-220FP full-pack, the plastic body isolates the backside tab — no separate insulating pad or washer needed when mounting to a grounded heatsink, which simplifies assembly and eliminates one thermal interface.
Rds(on) at junction temperature, not 25 °C
At 125 °C junction temperature the Rds(on) roughly doubles from the 25 °C value — budget for 660 mOhm hot resistance when estimating conduction loss in a continuous-load application like a PFC boost stage or a flyback converter primary switch.
The part is RoHS3 compliant; no exemption-based restrictions on the bill of materials for EU-market equipment.