The SSM3J377R from Toshiba is a MOSFET with Continous Drain Current -3.9 A, Drain Source Resistance 78.5 to 240 Milliohm, Drain Source Breakdown Voltage -20 V, Gate Source Voltage -8 to 6 V, Gate Source Threshold Voltage -1 to -0.3 V. Tags: Surface Mount. More details for SSM3J377R can be seen below.