The MJ421S, manufactured by CENTRAL SEMICONDUCTOR, is a robust NPN Bipolar Junction Transistor (BJT) designed for a wide range of applications. Supreme Components International is an authorised distributor of CENTRAL SEMICONDUCTOR components, ensuring you receive genuine and high-quality products. This transistor features a collector-emitter voltage (Vceo) of 80V and a continuous collector current (Ic) of 3A. Encased in a TO-251 package, the MJ421S offers excellent thermal performance. It is commonly used in power amplification, switching circuits, and linear regulators. Its NPN configuration allows for efficient current flow and signal amplification. The MJ421S is a reliable choice for both hobbyists and professional engineers seeking a versatile and dependable transistor.