The STL40DN3LLH5 from STMicroelectronics is a MOSFET with Continous Drain Current 7 to 40 A, Drain Source Resistance 0.016 to 0.025 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage 22 V, Gate Source Threshold Voltage 1 to 1.5 V. Tags: Surface Mount. More details for STL40DN3LLH5 can be seen below.