The CAP ALUM POLY 56UF 20 20V SMD capacitor is a type of electrolytic capacitor, specifically an aluminum-polymer variant. It has a capacitance value of 56 microfarads (µF) and a working voltage rating of 20 volts. This component is designed for surface mount devices (SMD), with a metric code reference number of 2917 or 7343. Its maximum leakage current is 40 milliohms, and it has an endurance of 1000 hours at an operating temperature of 125 degrees Celsius.