The SiA517DJ from Vishay is a MOSFET with Continous Drain Current 4.5 A, Drain Source Resistance 24 to 170 Milliohm, Drain Source Breakdown Voltage 12 V, Gate Source Voltage -8 to 8 V, Gate Source Threshold Voltage -1 to -0.4 V. Tags: Surface Mount. More details for SiA517DJ can be seen below.