The T491C476K020AT is a solid, SMD (surface mounted device) tantalum capacitor with a capacitance of 47uF and a rated voltage of 20V. It has an electrical parameter called "Equivalent Series Resistance" (ESR) of 900 and is manufactured by Kemet. It is constructed with two anode and cathode elements that can store an electric charge. This capacitor is designed to provide stable electric current at various frequencies, making it suitable for high-frequency and signal processing applications. The SMD construction allows for compact and reliable packaging, making it a valuable component in industrial and consumer electronics products.