The IPD90N04S4-04 from Infineon Technologies is a MOSFET with Continous Drain Current 81 to 90 A, Drain Source Resistance 3.7 to 4.1 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 IPD90N04S4-04 can be seen below.