The CAP ALUM POLY 390UF 20 6.3V SMD is a type of capacitor that features a radial, can design in the Surface Mount Device (SMD) format. It has a capacitance value of 390 microfarads and operates at a voltage rating of 6.3 volts. This aluminum-polymer capacitor is designed to provide long-lasting performance with a lifespan of 5000 hours at an operating temperature of 105 degrees Celsius.