The SCCX66B307S3PBLE from Kyocera AVX is a Supercapacitor with Capacitance 300000 mF, Voltage Rating 2.3 to 2.7 V, Equivalent Series Resistance 1.6 to 1.9 mOhms, Temperature Operating Range -40 to 85 Degree C. Tags: Through Hole. More details for SCCX66B307S3PBLE can be seen below.