The SSM3K318R from Toshiba is a MOSFET with Continous Drain Current 2.5 A, Drain Source Resistance 83.5 to 145 Milliohm, Drain Source Breakdown Voltage 60 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.8 to 2.8 V. Tags: Surface Mount. More details for SSM3K318R can be seen below.