1 F, 7.5 V energy buffer for hold-up and pulse loads
The KYOCERA AVX SCMR22G105SRBB0 is a 1 F supercapacitor rated at 7.5 V, part of the SCM series designed for energy buffering in applications where a battery would be oversized or a bulk electrolytic cannot deliver the peak current. The 180 mOhm ESR at 1 kHz defines the instantaneous current it can source without excessive internal heating — a 1 F cap with this ESR can deliver a 10 A pulse for roughly 100 ms before the voltage droops by 1 V, assuming the load duty cycle allows thermal recovery between pulses. The radial can, through-hole package with 0.531 inch (13.50 mm) lead spacing fits standard 0.1 inch grid prototyping boards and production layouts designed for cylindrical supercapacitors. The 0.945 x 0.315 inch (24.00 x 8.00 mm) footprint and 0.925 inch (23.50 mm) seated height mean it occupies roughly the same board area as a D-cell battery holder but sits lower, which matters for enclosures with tight z-axis clearance.
Lifetime and temperature derating
The 1000 hour lifetime rating at 65 °C is the accelerated test endpoint — in practice, operating at 45 °C instead of 65 °C roughly doubles the life per the Arrhenius model for electrolytic systems.
ESR and ripple current handling
The 180 mOhm ESR at 1 kHz is the AC parameter that governs ripple current capability. For a 100 kHz switching regulator input buffer, the ESR translates to roughly 2.5 A RMS ripple current before the internal temperature rise hits 10 °C above ambient — self-heating accelerates the electrolyte dry-out, so the lifetime derating curve should be applied if the ripple current exceeds 1.5 A RMS continuous. The -10%, +30% tolerance on the 1 F nominal capacitance means a fresh part measures between 0.9 F and 1.3 F. The wide positive tolerance is typical for supercapacitors and reflects the carbon electrode surface area variation. For hold-up time calculations, use the minimum 0.9 F at the end of life after the capacitance has degraded by 20-30% from the initial value.