The B43706A5129M657 from TDK Corporation is a Supercapacitor with Capacitance 12000 µF, Voltage Rating 450 V, Equivalent Series Resistance 2.4 to 7.7 milli-ohm, Temperature Operating Range -40 to 85 Degree C. Tags: Screw Mount. More details for B43706A5129M657 can be seen below.