This is a Intersil HUF75229P3 44A, 50V, 0.022 Ohm, N-Channel UltraFET Power MOSFET, which is manufactured using the innovative UltraFET™ process, which achieves the lowest possible on-resistance per silicon area, resulting in outstanding performance. It was designed for use in applications where power efficiency is important, such as switching regulators, switching converters, motor drivers, relay drivers, low- voltage bus switches, and power management in portable and battery-operated products.