Low-loss 40V power switch for high-current rails
The IRFS7430TRL7PP is an N-channel MOSFET from Infineon's HEXFET® and StrongIRFET™ series, designed for low-voltage, high-current switching applications where conduction losses dominate the thermal budget. Rated for a continuous drain current of 240 A at 25°C case temperature and a maximum power dissipation of 375 W, the die is sized for sustained high-current operation when the thermal path to the heatsink is adequate.
Gate drive and switching considerations
The total gate charge is 460 nC at 10 V, which means the gate driver must source a peak current of several amperes to achieve the target switching speed — a standard 1 A driver will struggle with rise times above 100 ns. Input capacitance (Ciss) is 13975 pF at 25 V drain-source; this large input capacitance sets the switching losses and the driver's average current draw at the operating frequency. The drive voltage range is 6 V to 10 V for achieving the specified Rds(on); operating at 6 V increases on-resistance above the datasheet minimum, so 10 V drive is recommended for full performance.