The CAP ALUM POLY 270UF 20 4V SMD is a type of capacitor, specifically an aluminum-polymer capacitor. It has a capacitance value of 270 microfarads (µF) and operates at a voltage rating of 4 volts. This component is part of the surface mount device (SMD) range and features a 2917/7343 metric package size. Additionally, it has an equivalent series resistance (ESR) of approximately 9 milliohms and is designed to withstand temperatures up to 105°C for a minimum duration of 2000 hours.