The B43733A5128M658 from TDK Corporation is a Supercapacitor with Capacitance 1200 µF, Voltage Rating 450 V, Equivalent Series Resistance 24 to 100 milli-ohm, Temperature Operating Range -25 to 85 Degree C. Tags: Screw Mount. More details for B43733A5128M658 can be seen below.