Aluminum-polymer capacitors with a capacitance of 330 microfarads and a voltage rating of 2.5 volts are used in the CAP ALUM POLY 330UF 20 component. This type of capacitor has radial leads and is packaged in a metal can, with an ESR (equivalent series resistance) of approximately 7 milliohms. It has been tested to last for 2000 hours at temperatures up to 105 degrees Celsius.