The STL40N10F7 from STMicroelectronics is a MOSFET with Continous Drain Current 40 A, Drain Source Resistance 20 to 24 Milliohm, Drain Source Breakdown Voltage 100 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 3 to 4.5 V. Tags: Surface Mount. More details for STL40N10F7 can be seen below.