The SSM3K56ACT from Toshiba is a MOSFET with Continous Drain Current 1.4 A, Drain Source Resistance 186 to 840 Milliohm, Drain Source Breakdown Voltage 20 V, Gate Source Voltage -8 to 8 V, Gate Source Threshold Voltage 0.4 to 1 V. Tags: Surface Mount. More details for SSM3K56ACT can be seen below.