The SSM6J503NU from Toshiba is a MOSFET with Continous Drain Current -6 A, Drain Source Resistance 27.7 to 89.6 Milliohm, Drain Source Breakdown Voltage -20 V, Gate Source Voltage -8 to 8 V, Gate Source Threshold Voltage -1 to -0.3 V. Tags: Surface Mount. More details for SSM6J503NU can be seen below.