The IAUS180N04S4N015 from Infineon Technologies is a MOSFET with Continous Drain Current 169 to 180 A, Drain Source Resistance 1.2 to 1.5 Mohms, Drain Source Breakdown Voltage 40 V, Gate Source Voltage 20 V, Gate Source Threshold Voltage 2 to 4 V. Tags: Surface Mount. More details for IAUS180N04S4N015 can be seen below.