The IXFT44N50Q3 from Littelfuse is a MOSFET with Continous Drain Current 44 A, Drain Source Resistance 140 Milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -30 to 30 V, Gate Source Threshold Voltage 3.5 to 6.5 V. Tags: Surface Mount. More details for IXFT44N50Q3 can be seen below.