The 2SK4017(Q) is a discrete semiconductor component designed for use in various electronic applications. It is a field-effect transistor (FET) with a TO-220 package. This transistor has a low on-resistance and high current-handling capability, making it suitable for power switching applications. The 2SK4017(Q) has a maximum drain-source voltage of 800V and a continuous drain current rating of 4A. It also has a low gate threshold voltage of 3V, allowing for easy and efficient control of the device. Overall, the 2SK4017(Q) is a reliable and high-performance discrete semiconductor component that is ideal for power switching applications