The SSM3K324R from Toshiba is a MOSFET with Continous Drain Current 4 A, Drain Source Resistance 45 to 109 Milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage 0.4 to 1 V. Tags: Surface Mount. More details for SSM3K324R can be seen below.