The PZTA56 from ON Semiconductor is a high-powered Bipolar (BJT) PNP transistor with a maximum collector-emitter voltage of 80 V, a maximum collector current of 500 mA, and a maximum power of 1 W. This transistor is designed for low-frequency operation up to 50 MHz and is packaged in a surface mount SOT-223-4 package. It features a wide range of features including high-speed switching, current amplification, and noise reduction. It is widely used in consumer and industrial applications including electronic ballasts, audio amplifiers, motor controllers, and LED drivers. This transistor is suitable for use in both switched-mode and linear applications.