The SSM6N61NU from Toshiba is a MOSFET with Continous Drain Current 4 A, Drain Source Resistance 25 to 108 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 SSM6N61NU can be seen below.