55 V N-channel HEXFET in TO-247AC
On-resistance and gate drive budget
That 8 mOhm figure is the conduction loss floor at 25 °C junction — expect it to roughly double at 175 °C junction, which is the real operating resistance for a hot board. The 170 nC total gate charge at Vgs=10 V means the gate driver must supply 8.5 mA average current to switch at 50 kHz; a 100 kHz switching frequency pushes that to 17 mA. The 4000 pF input capacitance at Vds=25 V gives a first-order estimate of the switching energy per cycle.
The TO-247AC package has a large metal tab that carries the drain potential — the tab is the primary heat path. Maximum power dissipation is 200 W at case temperature, but the real limit is keeping the junction under 175 °C. The through-hole mounting means the part can be reworked with a soldering iron or hot-air station; the three leads are on 0.170-inch pitch, easy to desolder without lifting pads.