The AP9444CYT from Advanced Power Electronics Corp is a MOSFET with Continous Drain Current 23.4 to 50 A, Drain Source Resistance 2 to 3.5 milli-ohm, Drain Source Breakdown Voltage 20 V, Gate Source Voltage -12 to 12 V, Gate Source Threshold Voltage 0.5 to 1.2 V. Tags: Surface Mount. More details for AP9444CYT can be seen below.