The RSJ451N04FRA from ROHM Semiconductor is a MOSFET with Continous Drain Current -45 to 45 A, Drain Source Resistance 9.5 to 13.5 milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.2 to 3 V. Tags: Surface Mount. More details for RSJ451N04FRA can be seen below.