The IXFX400N15X3 from Littelfuse is a MOSFET with Continous Drain Current 400 A, Drain Source Resistance 3 Milliohm, Drain Source Breakdown Voltage 150 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2.5 to 4.5 V. Tags: Through Hole. More details for IXFX400N15X3 can be seen below.