This document describes the features and characteristics of the STE40NK90ZD N-CHANNEL 900V - 0.14Ω - 40 A ISOTOP Super FREDMesh™ MOSFET, including extremely high dv/dt capability, 100% avalanche tested, minimized gate charge, very low intrinsic capacitances, and very good manufacturing repeatability. This product is suitable for high current, high-speed switching, and welding equipment.