The MJ421 is a robust NPN Bipolar Junction Transistor (BJT) manufactured by CENTRAL SEMICONDUCTOR. Supreme Components International is an authorised distributor of CENTRAL SEMICONDUCTOR components. This transistor is designed for through-hole mounting and comes in a TO-66 package. Key specifications include a collector-emitter voltage (Vceo) of 80V, a continuous collector current (Ic) of 3A, and a power dissipation (Pd) of 30W. The MJ421 is commonly used in amplifier and switching circuits. Its high voltage and current capabilities make it suitable for applications requiring reliable performance. Consider the MJ421 for your next design requiring a durable and dependable BJT.