The Si4202DY from Vishay is a MOSFET with Continous Drain Current 12.1 A, Drain Source Resistance 11.5 to 17 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 Si4202DY can be seen below.