The RSJ400N10 from ROHM Semiconductor is a MOSFET with Continous Drain Current -40 to 40 A, Drain Source Resistance 19 to 30 Milliohm, Drain Source Breakdown Voltage 100 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.5 V. Tags: Surface Mount. More details for RSJ400N10 can be seen below.