The FZT605TA is a Transistors Darlington NPN Darlington manufactured by Diodes Incorporated. It is a high-power, high-gain device that is designed for use in high-current, high-frequency switching applications. It has a TO-220 package, a maximum current gain of 500, and a maximum collector current of 4 A. Its maximum voltage rating is 100 V. It also features a wide base-emitter voltage range of 1.3 V to 80 V. This device is widely used in audio amplifiers, switching regulators, and motor control applications.