The 257DCN2R7SDP from Cornell Dubilier is a Supercapacitor with Capacitance 250000 mF, Voltage Rating 2.7 V, Equivalent Series Resistance 13 to 18 mOhms, Temperature Operating Range -40 to 60 Degree C. Tags: Through Hole. More details for 257DCN2R7SDP can be seen below.