The CAP ALUM POLY 56UF 20 63V SMD is a type of capacitor. It has a capacitance of 56 microfarads and can handle voltages up to 63 volts. This aluminum-polymer capacitor comes in a radial, through-hole package with a 30 milliohm ESR rating and an operating life of 10,000 hours at temperatures of up to 105 degrees Celsius.