60 V, 8.4 mOhm automotive N-channel — conduction loss floor for high-current switching
The AUIRF1018ES: That Rds(on) figure sets the conduction loss at a given load current — at 47 A the dissipation is roughly 18.5 W, well within the 110 W package limit, so the part runs cool in a motor-drive or DC-DC converter stage without oversized heatsinking. The gate charge is 69 nC at 10 V, which dictates the drive current needed for a target switching frequency. A 100 kHz PWM with a 10 V gate swing draws about 6.9 mA from the gate driver — a standard automotive gate-driver IC handles that without thermal stress.
Automotive temperature grade and AEC-Q101 qualification
Junction temperature range is -55°C to 175°C, the full automotive Grade 1 band. An engine-bay ECU that sees 105°C ambient on a summer day still has 70°C of margin before the die reaches its rated maximum, so the part can handle transient overloads during cold-crank or load-dump without immediate derating.
Surface-mount D2PAK — board-level integration
The AUIRF1018ES comes in a surface-mount package (D2PAK) supplied in bulk. A 1 in² copper pour on a 2 oz board keeps the junction below 125°C at 47 A continuous.