The SI4532DY from onsemi is a MOSFET with Continous Drain Current -3.5 to 3.9 A, Drain Source Resistance 53 to 95 milliohm, Drain Source Breakdown Voltage -30 to 30 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage -3 to 3 V. Tags: Surface Mount. More details for SI4532DY can be seen below.