FC Series SMT Super Capacitors. KEMET FC Supercapacitors are surface mount capacitors for use with high energy applications. These supercapacitors are designed especially for reflow soldering, allowing them to be attached to the printed circuit board directly. Features. Wide range of temperature from 25°C to +70°C Surface mount without holder Operational Voltage: 3.5 to 5.5 V dc Highly reliable against liquid leakage Maintenance free. Applications. Low voltage DC hold-up applications Embedded microprocessor systems with flash memory. Supercapacitors can be used like a secondary battery when applied in a DC circuit