The RSHVK821M1JFH0002EX from Taiyo Yuden is a Supercapacitor with Capacitance 820 µF, Voltage Rating 6.3 V, Equivalent Series Resistance 18 milli-ohm, Temperature Operating Range -55 to 125 Degree C. Tags: Surface Mount. More details for RSHVK821M1JFH0002EX can be seen below.