180A at 100V — sizing the power stage
The IRFSL4010PBF: That current rating assumes the case is held at 25°C — in a real enclosure with 60°C ambient and a heatsink, the usable current derates significantly, so the thermal design must be sized for the 375W maximum dissipation at the case. The 4.7mOhm on-resistance at 10V gate drive produces 153W I²R loss at 180A.
Gate drive and switching budget
The 9575 pF input capacitance at 50V Vds sets the Miller plateau charge. Combined with the 215 nC Qg, this part is designed for hard-switched topologies at moderate frequencies — think 20-50 kHz in a DC-DC converter or motor inverter. The ±20V maximum gate rating gives margin for gate-drive overshoot in noisy environments. The 4V threshold at 250µA drain current means the device is fully enhanced by 10V drive but will start conducting well below 5V — important for shoot-through prevention in half-bridge designs where the gate driver must hold the off-state below 4V during the dead time.
Package and thermal interface
The TO-262-3 (I²Pak) package is a through-hole variant with long leads — the same die as the TO-220 but with a longer lead length for heatsink mounting in applications where the PCB is on one side of the chassis and the heatsink on the other. The 175°C Tj max gives headroom for transient overloads but continuous operation above 150°C junction accelerates oxide wear-out.
Lifecycle and sourcing posture
The part is ROHS3 compliant (lead-free).