The IPB120N04S4-01 from Infineon Technologies is a MOSFET with Continous Drain Current 120 A, Drain Source Resistance 1.35 to 1.9 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 IPB120N04S4-01 can be seen below.