The TSM320N03CX from Taiwan Semiconductor is a MOSFET with Continous Drain Current 5.5 A, Drain Source Resistance 27 to 40 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage 0.4 to 0.9 V. Tags: Surface Mount. More details for TSM320N03CX can be seen below.