Device identity and key power-switch ratings
The AUIRFU1010Z is an N-channel power MOSFET from Infineon, rated for 55 V drain-source voltage and 42 A continuous drain current — a through-hole TO-251 (IPAK) part suited for medium-current switching in automotive and industrial power trains. Total gate charge is 95 nC at 10 Vgs — the gate-driver must source this charge each switching cycle, so the switching frequency is limited by the driver's peak current and the gate-loop inductance.
Thermal and voltage endurance
Maximum power dissipation is 140 W — the actual continuous dissipation in a real board depends on the copper pad area under the TO-251 tab and the airflow across the leads. Gate-source voltage is limited to ±20 V absolute maximum; the gate drive should clamp transients below this to avoid oxide rupture.