25 F, 3 V, 27 mOhm — the parametric envelope that defines the SCCU25E256SRB
The KYOCERA AVX SCCU25E256SRB is a 25 F supercapacitor rated at 3 V with a maximum DC ESR of 27 mOhm at 1 kHz. That ESR figure governs the peak current the cell can deliver and the self-heating under charge/discharge cycles — a 27 mOhm ESR at 25 F means the RC time constant is under 0.7 seconds, so this part handles short-duration power pulses without significant voltage sag. The 65°C ceiling is the practical limit for the electrolyte; above that, the lifetime derating accelerates.
Footprint and board integration
Lead spacing is 0.295 inches (7.50 mm), and the termination is standard PC pins — the hole pattern on the PCB must match this 7.5 mm pitch, not the more common 5.0 mm or 10.0 mm supercapacitor footprints. Supplied in bulk packaging; the capacitance tolerance is -10% / +30%, so the minimum capacitance at end of life is 22.5 F. Design the hold-up time budget using the -10% floor, not the nominal 25 F.