The CAP ALUM POLY 220UF 20 2.5V SMD is a type of capacitor that features aluminum-polymer construction, with a capacitance value of 220 microfarads (µF) and a voltage rating of 2.5 volts. It has a surface mount design (SMD), making it suitable for compact electronics. This component is used in various applications and is specified to withstand temperatures up to 105°C for 1000 hours, with an expected resistance value of approximately 15 milliohms.