The IXTN660N04T4 from Littelfuse is a MOSFET with Continous Drain Current 660 A, Drain Source Resistance 0.85 Milliohm, Drain Source Breakdown Voltage 40 V, Gate Source Voltage -15 to 15 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Chassis Mount. More details for IXTN660N04T4 can be seen below.