The RD3U040CN from ROHM Semiconductor is a MOSFET with Continous Drain Current -4 to 4 A, Drain Source Resistance 930 to 1300 milliohm, Drain Source Breakdown Voltage 250 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 3.5 to 5.5 V. Tags: Surface Mount. More details for RD3U040CN can be seen below.