The IPLU300N04S4-1R1 from Infineon Technologies is a MOSFET with Continous Drain Current 300 A, Drain Source Resistance 0.83 to 1.15 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 IPLU300N04S4-1R1 can be seen below.