The MCQ18N03 from Micro Commercial Components is a MOSFET with Continous Drain Current 18 A, Drain Source Resistance 5.4 to 10 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 1 to 2.5 V. Tags: Surface Mount. More details for MCQ18N03 can be seen below.