The PT1903 is a packaged LED driver manufactured by Princeton Technology. It is designed for use in a variety of automotive and industrial LED lighting applications. It features an ESOP-8 RoHS compliant package and is capable of driving LEDs in a range from 0.4 to 4.2 volts. It has built-in protection features such as over-voltage, over-temperature, and over-current protection. The device also offers a unique wide-input voltage range of up to 35V, allowing it to be used in many applications. It is reliable, durable, and energy efficient, making it an ideal choice for automotive and industrial LED lighting solutions.