650 V N-channel in a fully isolated TO-220FP
The STF15N65M5: It comes in a TO-220FP full-pack through-hole package, which means the backside tab is fully isolated — no mica washer or insulating pad needed when bolting to a grounded heatsink.
Total gate charge is 22 nC at 10 V. Input capacitance is 816 pF at 100 V drain-source, a moderate figure that does not force a high-current pre-driver IC.
Package and thermal path for the rework bench
The TO-220FP full-pack body has no exposed metal tab — the junction-to-case thermal path runs through the moulded epoxy back. Maximum power dissipation is 30 W at case temperature, so the heatsink interface relies on full-face contact, not a point contact through a washer.