55 V, 160 A — a high-current switching MOSFET
This is an N-channel HEXFET power MOSFET rated for 55 V drain-source breakdown (Vds) and 160 A continuous drain current (Id). Gate charge is 290 nC maximum at Vgs=10 V, which means the gate driver must supply about 290 nC per switching cycle. At a 100 kHz switching frequency, the average gate-drive current works out to roughly 29 mA — well within the capability of most dedicated MOSFET drivers, but the driver's peak current rating should be checked against the gate charge profile. The maximum gate-source voltage is ±20 V, so a standard 10 V or 12 V gate drive is safe, but a 15 V rail is still within the absolute maximum. A gate resistor in the 10-ohm range is typical to damp ringing on the gate node.
175°C junction — rated for harsh environments
The 300 W power dissipation (at Tc=25°C) gives thermal headroom in a properly heatsinked design.
TO-262 through-hole — a rugged package for high current
Housed in a TO-262 (TO-262-3) through-hole package, the AUIRF3805L suits designs where vibration resistance and mechanical strength are priorities. The through-hole mounting allows a large copper tab for heatsink attachment, which is essential for dissipating the 300 W maximum power.