The TSM055N03EPQ56 from Taiwan Semiconductor is a MOSFET with Continous Drain Current 80 A, Drain Source Resistance 4.5 to 8.5 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1.2 to 2.5 V. Tags: Surface Mount. More details for TSM055N03EPQ56 can be seen below.