The SSM6K513NU from Toshiba is a MOSFET with Continous Drain Current 15 A, Drain Source Resistance 6.5 to 12 Milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.1 to 2.1 V. Tags: Surface Mount. More details for SSM6K513NU can be seen below.