The AUIRFSA8409-7P from Infineon Technologies is a MOSFET with Continous Drain Current 360 to 523 A, Drain Source Resistance 0.50 to 0.69 Mohms, Drain Source Breakdown Voltage 40 V, Gate Source Voltage 20 V, Gate Source Threshold Voltage 2.2 to 3.9 V. Tags: Surface Mount. More details for AUIRFSA8409-7P can be seen below.