The SiA449DJ from Vishay is a MOSFET with Continous Drain Current 12 A, Drain Source Resistance 15.5 to 38 Milliohm, Drain Source Breakdown Voltage -30 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage -1.5 to -0.6 V. Tags: Surface Mount. More details for SiA449DJ can be seen below.