100 V N-channel with 7 mOhm — the conduction-loss number
The BSC070N10LS5ATMA1: The 7 mOhm Rds(on) at 40 A, 10 V drive, and 83 W Tc rating define the conduction-loss budget for heatsink design.
Current rating split — Ta vs Tc tells the thermal story
The continuous drain current is listed at 14 A at 25 °C ambient (Ta) and 79 A at 25 °C case (Tc). That spread is the thermal design envelope: the 14 A figure assumes free-air convection on a standard PCB footprint, while the 79 A figure assumes the case is held at 25 °C — which means a serious heatsink or active cooling. For a motor-drive or battery-charger board, the real-world current limit lands somewhere between, set by the junction temperature ceiling of 150 °C.
Gate drive and switching — 20 nC at 4.5 V
Gate charge is 20 nC at 4.5 V. Input capacitance is 2700 pF at 50 V.
Package and footprint — PG-TDSON-8-7
The part comes in an 8-PowerTDFN package, supplier device code PG-TDSON-8-7. That is a surface-mount package with an exposed drain pad on the bottom — the PCB thermal land pattern is critical for pulling heat out of the die.