Application
Supercapacitors for UPS and Memory Backup
Data protection for SSDs, RAID controllers, and DC UPS ride-through.
Power requirements
Power-loss protection needs enough energy to flush caches and complete writes — typically tens of milliseconds to a few seconds. DC UPS systems may need seconds to ride through short outages.
Why supercapacitors fit
Supercapacitors deliver high current instantly and can be health-monitored by measuring capacitance and ESR in-circuit.
Selection factors
- Flush energy and timing
- Health-monitoring approach
- Height and footprint on dense boards
Limitations
- Long-duration UPS runtime still requires batteries
Supercapacitor types
EDLC Supercapacitors
Electric double-layer capacitors store charge electrostatically at the electrode–electrolyte interface.
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Coin-Cell Supercapacitors
Low-profile button cells for RTC and memory hold-up where current is in the microamp range.
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Radial-Lead Supercapacitors
Through-hole cylindrical cells for PCB mounting, typically from about 0.5 F to around 100 F.
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5.5V Supercapacitors
Pre-assembled 5.5 V parts for direct use on 5 V and 3.3 V logic rails.
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Sizing a supercapacitor for ups and memory backup?
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