The TSM042N03CS from Taiwan Semiconductor is a MOSFET with Continous Drain Current 30 A, Drain Source Resistance 3.8 to 6 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 TSM042N03CS can be seen below.