1 F cell at 9 V — hold-up time and ESR trade-off
The SCMR22L105SRBB0 is a 1 F supercapacitor from KYOCERA AVX's SCM series, rated at 9 V with an ESR of 350 mΩ at 1 kHz. The 1 F capacitance stores enough energy to bridge a few seconds of supply dropout for a low-power microcontroller or RTC backup circuit, but the 350 mΩ ESR means the instantaneous voltage drop under a 1 A load is 350 mV — enough to pull the terminal voltage below the regulator's dropout if the load pulse is fast. The -10%/+30% tolerance on capacitance means a fresh part can measure anywhere from 0.9 F to 1.3 F; the hold-up time calculation should use the minimum value for a guaranteed margin.
Through-hole radial can — board footprint and thermal limits
For every 10 °C below 65 °C, the expected lifetime roughly doubles — at 45 °C the endurance is approximately 4000 hours, and at 25 °C it extends beyond 16,000 hours. The PC pin termination is suited for wave-solder assembly; the radial can body should be spaced off the board to allow electrolyte venting and to avoid heat transfer from the board during rework.