The STL64DN4F7AG from STMicroelectronics is a MOSFET with Continous Drain Current 40 A, Drain Source Resistance 7 to 8.5 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 STL64DN4F7AG can be seen below.