Supercapacitors - EDLC and Hybrid Ultracapacitors

ADD Components is a professional electronic components distributor supplying supercapacitors (ultracapacitors) for backup power, energy harvesting, automotive start-stop and UPS applications. We source electric double-layer capacitors (EDLC) and hybrid supercapacitors from leading brands including Eaton, Maxwell/Tesla, Panasonic, Murata and KEMET. From high-capacitance cells for industrial energy storage to compact SMD devices for RTC memory backup, we provide competitive wholesale pricing, verified stock and fast global delivery from our Hong Kong operations. Our team supports procurement engineers and contract manufacturers in selecting the right capacitance, voltage and ESR combination for each power design.

Supercapacitor Types and Variants

Electric Double-Layer Capacitors (EDLC)

EDLCs store energy electrostatically through the separation of charge at the interface between a conductive electrode and an electrolyte, rather than through a chemical reaction. This mechanism delivers extremely high capacitance, from fractions of a farad up to thousands of farads, combined with rapid charge and discharge capability and cycle lives of hundreds of thousands of cycles. EDLCs are the most common supercapacitor type, widely used for short-term energy buffering, memory backup and peak power support.

Hybrid Supercapacitors

Hybrid supercapacitors, also known as lithium-ion capacitors, combine one EDLC electrode with one lithium-ion battery electrode to achieve higher operating voltages (typically 3.8V) and greater energy density than conventional EDLCs. They bridge the gap between supercapacitors and batteries, delivering more stored energy while retaining fast charge, high power output and long cycle life. Hybrid supercapacitors are increasingly selected where higher energy density is required in a compact footprint.

Power vs. Energy Density

Supercapacitors are distinguished by their power density, which far exceeds that of batteries, and their energy density, which remains below lithium-ion batteries. This trade-off makes them ideal for applications that need short bursts of high power, frequent charge and discharge cycles, or very long calendar life. Selecting the right device requires balancing capacitance, voltage rating, ESR and physical size against the energy and power profile of the application, and sizing the bank to deliver the required peak current over the specified hold-up time.

Backup Power and UPS Applications

Supercapacitors provide short-duration hold-up power during mains interruptions, allowing systems to save critical data and shut down gracefully. In UPS and industrial equipment they bridge the gap between power loss and generator or battery take-over, and are frequently paired with batteries to absorb the high peak currents that would otherwise shorten battery life. Their long cycle life and wide operating temperature range make them ideal for telecom, server and factory automation backup.

Energy Harvesting and Automotive Start-Stop

In energy harvesting systems, supercapacitors buffer the intermittent energy from solar, vibration and thermal sources, delivering reliable power to low-power sensors and wireless nodes. In automotive start-stop and micro-hybrid systems, they supply the high current needed for engine cranking and regenerative braking energy recovery, extending battery life and improving fuel efficiency. They are also used for peak power assist in traction, rail and grid stabilization applications, where their ability to absorb and release large currents rapidly reduces stress on the primary battery.

Key Selection Parameters

• Capacitance value (farads) and tolerance

• Rated voltage and surge voltage

• ESR and leakage current

• Type (EDLC or hybrid / lithium-ion capacitor)

• Operating and storage temperature range

• Cycle life and calendar life

• Package style (cylindrical, radial, coin cell, SMD, module)

• Mounting and terminal configuration

Representative Capacitors We Source

Send Us Your Capacitor Requirements

Send us your bill of materials or part numbers and our team will quote competitive wholesale pricing with fast delivery. We supply supercapacitors in individual cells, radial, SMD and module packaging for production and prototyping.

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