The IXFN170N25X3 from Littelfuse is a MOSFET with Continous Drain Current 146 A, Drain Source Resistance 7.4 Milliohm, Drain Source Breakdown Voltage 250 V, Gate Source Voltage -20 to 20 V, Gate Source Threshold Voltage 2.5 to 4.5 V. Tags: Chassis Mount. More details for IXFN170N25X3 can be seen below.