Capacitance and voltage — sizing the energy buffer
The SCMQ14D474PRBB0: 470 mF at 5.4 V stores roughly 6.85 J — enough to hold up a real-time clock or SRAM during a brief mains dropout, or to supply a peak-current pulse that the main supply cannot deliver alone. 0%, +100% tolerance means the actual capacitance can land anywhere from 470 mF up to 940 mF — the energy storage and discharge time constant vary by up to 2× across the tolerance band, so a design that depends on a minimum hold-up time should be verified at the low end.
ESR and temperature — the real-world limits
Rated for 1000 hours at 65°C — in a 45°C enclosure the lifetime roughly doubles per 10°C below the rated temperature, so expect ~4000 hours before capacitance drops below the end-of-life threshold. At 85°C the lifetime is derated further; continuous operation at the upper limit is not recommended.
Radial through-hole can, 13.60 mm x 6.30 mm body, 0.354" (9.00 mm) lead spacing — fits standard 0.1" pitch prototyping grids and most PCB layouts for cylindrical supercapacitors. Seated height of 0.610" (15.50 mm) above the board — allow clearance for the vent at the top of the can; do not pot or conformally coat the vent area. PC pin termination: the leads are designed for wave soldering; hand-solder with a temperature-controlled iron at 350°C max, dwell under 5 seconds per joint to avoid damaging the internal seal.
No pin-compatible direct replacement is listed in the SCM family — the SCMQ14D474PRBB0 is the specific capacitance/voltage/ESR variant for this footprint. If the line needs a faster alternative, the SCM series includes lower-ESR options at the same voltage but different capacitance values; verify the hold-up time budget before substituting.