The IPC50N04S5-5R8 from Infineon Technologies is a MOSFET with Continous Drain Current 44 to 50 A, Drain Source Resistance 5 to 7.2 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 IPC50N04S5-5R8 can be seen below.