The IXFT30N50Q3 from Littelfuse is a MOSFET with Continous Drain Current 30 A, Drain Source Resistance 200 Milliohm, Drain Source Breakdown Voltage 500 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 3.5 to 6.5 V. Tags: Surface Mount. More details for IXFT30N50Q3 can be seen below.