The 2N6403G is a 3A, 40V NPN Plastic-Encapsulated Transistor manufactured by ON Semiconductor. This transistor has a collector voltage of up to 40V and can handle currents up to 3A. It is widely used in switch-mode power supplies, dc–dc converters, and high frequency inverters. It features a good collector-emitter voltage, low collector-base voltage, low noise, good thermal stability, and high speed switching characteristics. It is available in TO-220 packaging and is operating in junction temperatures ranging from -55°C to +150°C. It is an ideal solution for high power switching applications in consumer, industrial, and automotive applications.