The CAP ALUM POLY 150UF 20 4V SMD capacitor is a type of radial, can-style aluminum-polymer electrolytic capacitor. It has a capacitance value of 150 microfarads and an operating voltage rating of 4 volts. The component is designed for surface mount technology (SMD) applications and features a resistance of 30 milliohms with a lifespan of 2000 hours at an operating temperature of 105 degrees Celsius.