The STN83003 is an NPN bipolar Transistor by STMicroelectronics that is rated for 400V and has a 1.5A DC collector current and a 1.6W power output. It comes in an SOT223 form factor, which is a widely used surface-mount packaging type, making it perfect for surface mounted applications. It is designed to handle switch and amplifier configurations in various commercial, automotive, and industrial applications such as sensing, motor control, and high-side switching.