The B43733B9278M658 from TDK Corporation is a Supercapacitor with Capacitance 2700 µF, Voltage Rating 400 V, Equivalent Series Resistance 14 to 45 milli-ohm, Temperature Operating Range -25 to 85 Degree C. Tags: Screw Mount. More details for B43733B9278M658 can be seen below.