Aluminum-polymer capacitors, specifically CAP ALUM POLY 330UF 20 4V SMD, are used for radial and can applications in Surface Mount Device (SMD) formats. They offer a capacitance of 330 microfarads at 4 volts with a maximum resistance of 15 milliohms. The capacitors have been tested to last up to 2000 hours at temperatures reaching 105 degrees Celsius.