The IXFT50N30Q3 from Littelfuse is a MOSFET with Continous Drain Current 50 A, Drain Source Resistance 80 Milliohm, Drain Source Breakdown Voltage 300 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 3.5 to 6.5 V. Tags: Surface Mount. More details for IXFT50N30Q3 can be seen below.