The STL15DN4F5 from STMicroelectronics is a MOSFET with Continous Drain Current 60 A, Drain Source Resistance 8 to 9 Milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for STL15DN4F5 can be seen below.