The B43726B9398M658 from TDK Corporation is a Supercapacitor with Capacitance 3900 µF, Voltage Rating 400 V, Equivalent Series Resistance 5.7 to 19 milli-ohm, Temperature Operating Range -40 to 85 Degree C. Tags: Screw Mount. More details for B43726B9398M658 can be seen below.