The STP40NF10 from STMicroelectronics is a MOSFET with Continous Drain Current 50 A, Drain Source Resistance 25 to 28 Milliohm, Drain Source Breakdown Voltage 100 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Through Hole. More details for STP40NF10 can be seen below.