The 2SK3515, 2SK-3515, K3515, 3515 is a 450V, 10A, 48W TO-220NIS Package MOSFET, The FUJI Electric manufacturer is a IC Chips with N CHANNEL SILICON POWER MOSFET for more details of 2SK3515 can be seen below.
This HEXFET® Power MOSFET utilizes the latest ID = 75A processing techniques to achieve extremely low on-resistance per silicon area. This design are a 175°C junction operating temperature, fast switching speed and improved repetitive avalanche rating.