The Si7121ADN from Vishay is a MOSFET with Continous Drain Current 18 A, Drain Source Resistance 12.5 to 60 Milliohm, Drain Source Breakdown Voltage -30 V, Gate Source Voltage -25 to 25 V, Gate Source Threshold Voltage -2.5 to 1.2 V. Tags: Surface Mount. More details for Si7121ADN can be seen below.