The CAP ALUM POLY 220UF 20 6.3V SMD is a type of capacitor that utilizes an aluminum-polymer electrolyte in its construction. This capacitor is designed to have a radial configuration, with a can-type housing suitable for surface-mount devices (SMD). The specified capacitance value is 220 microfarads, and it operates at a voltage rating of 6.3 volts. It also meets the requirements for high-temperature applications, offering an endurance rating of 2000 hours at an operating temperature of 105 degrees Celsius.