The IAUC120N04S6N009 from Infineon Technologies is a MOSFET with Continous Drain Current 120 A, Drain Source Resistance 0.75 to 1.1 Mohms, Drain Source Breakdown Voltage 40 V, Gate Source Voltage 20 V, Gate Source Threshold Voltage 2.2 to 3.4 V. Tags: Surface Mount. More details for IAUC120N04S6N009 can be seen below.