The IPZ40N04S5-5R4 from Infineon Technologies is a MOSFET with Continous Drain Current 40 A, Drain Source Resistance 4.4 to 6.3 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 IPZ40N04S5-5R4 can be seen below.