The TSM3446CX6 from Taiwan Semiconductor is a MOSFET with Continous Drain Current 5.3 A, Drain Source Resistance 27 to 40 milliohm, Drain Source Breakdown Voltage 20 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage 0.5 to 1 V. Tags: Surface Mount. More details for TSM3446CX6 can be seen below.