The SSM6K406TU from Toshiba is a MOSFET with Continous Drain Current 4.4 A, Drain Source Resistance 18 to 38.5 Milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.3 to 2.5 V. Tags: Surface Mount. More details for SSM6K406TU can be seen below.