The 175°C junction rating extends the safe operating area into high-ambient environments like an engine bay or a sealed power supply.
Gate charge and switching — sizing the driver
Total gate charge is 84 nC at 10 V. At a 100 kHz switching frequency the gate driver must source 8.4 mA average current; a 200 kHz design needs 16.8 mA. The 3070 pF input capacitance at 50 V Vds gives the driver a capacitive load to charge each cycle — a driver with 2 A peak current capability will switch the gate in roughly 30 ns. The 4 V threshold at 100 µA Id means a 5 V logic-level gate drive will turn the device on hard, but the 10 V drive voltage listed for the minimum Rds(on) is where the lowest conduction loss occurs.
D-Pak footprint — thermal and layout notes
The TO-252 (DPak) surface-mount package has an exposed drain tab. The 140 W power dissipation at case temperature assumes the tab is soldered to a copper pad with thermal vias to an inner-layer or backside copper plane. Without adequate thermal management the junction temperature rises above 175°C at high continuous current.