The STD45P4LLF6AG from STMicroelectronics is a MOSFET with Continous Drain Current -50 A, Drain Source Resistance 12 to 20 Milliohm, Drain Source Breakdown Voltage -40 V, Gate Source Voltage -18 to 18 V, Gate Source Threshold Voltage -2.5 to -1 V. Tags: Surface Mount. More details for STD45P4LLF6AG can be seen below.