The STD64N4F6AG from STMicroelectronics is a MOSFET with Continous Drain Current 54 A, Drain Source Resistance 7 to 8.2 Milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2 to 4.5 V. Tags: Surface Mount. More details for STD64N4F6AG can be seen below.