The Si4501BDY from Vishay is a MOSFET with Continous Drain Current 12 A, Drain Source Resistance 13.5 to 37 milliohm, Drain Source Breakdown Voltage 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -0.45 to 2 V. Tags: Surface Mount. More details for Si4501BDY can be seen below.