The SSM6K404TU from Toshiba is a MOSFET with Continous Drain Current 3 A, Drain Source Resistance 43 to 147 Milliohm, Drain Source Breakdown Voltage 20 V, Gate Source Voltage -10 to 10 V, Gate Source Threshold Voltage 0.35 to 1 V. Tags: Surface Mount. More details for SSM6K404TU can be seen below.