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High Efficiency Low ESR Ultracapacitors and Modules


What are Ultracapacitors?

Ultracapacitors, or supercapacitors as they are also known, are an energy storage technology that offers high power density, almost instant recharging and very long lifetimes.  Because they store energy in an electric field, rather than in a chemical reaction, they can survive hundreds of thousands more charge and discharge cycles than a battery.

Features and Benefits

  • Very long lifetimes (up to 1,000,000 duty cycles or 10 year DC life)
  • Rapid charge and discharge
  • High efficiency low ESRmax (0.25mΩ for 3000F)
  • No maintenance requirements
  • No harmful chemicals or toxic metals
  • Wide range operating temperatures (from -40 °C to 65 °C)

Typical Applications

  • Automotive subsystems
  • Burst/Boost power delivery for cold starting diesel or gasoline engines
  • Wind turbine pitch control
  • Hybrid vehicles
  • Railroad braking
  • Industrial motor braking
  • Energy storage recovery
  • UPS & telecom system power stabilization


  • High Efficiency Low ESR Ultracapacitors
  • Electric double layer capacitor
  • Available with welded post or threaded terminals (including nuts)
  • Parallel connecting bracket available, optional

We also offer Ultracapacitor modules with charge balancing circuitry designed to your power delivery and packaging requirements.

The Advantage of Low ESR (Equivalent Series Resistance) Ultra and Super Capacitors

ESR, which involves resistances of cell components, for example, electrolyte resistance and contact resistance between current collectors and electrodes affects the power delivery of a cell.  High ESRs restrict the rate at which supercapacitors can be charged and discharged, leading to power reduction and energy dissipation.

Electric Vehicle

Electric/Hybrid Vehicles

Rapid Energy Storage and Recovery

Energy Storage and


Low Maintenance Wind Turbine Pitch Control Power


Power Boost for Diesel and Gasoline Engine Cold Starting

Selection Table

Part Number
(Note 1)
Rated Voltage (V) Rated Cap. (F) ᶲDxL (mm) ESRAC (1kHz/mΩ) ESRDC (mΩ) Maximum Continuous Current (A)(∆T=40°C)
(Note 2)
Maximum Peak Current (A) Maximum Leakage Current (72hrs/mA) Power Density (W/kg)
(Note 3)
Maximum Energy (Wh)
(Note 4)
Energy Density (Wh/kg)
(Note 5)
ESC1200F-2.7V-CAP-X 2.7 1200 60x74 0.40 0.46 110.0 1000 3.00 7300 1.2 4.7
ESC1500F-2.7V-CAP-X 2.7 1500 60x85 0.33 0.37 140.0 1300 3.00 8400 1.5 5.4
ESC2000F-2.7V-CAP-X 2.7 2000 60x102 0.25 0.35 170.0 1600 3.00 8100 2.0 5.6
ESC3000F-2.7V-CAP-X 2.7 3000 60x138 0.22 0.25 210.0 2300 5.20 7000 3.0 6.0

Notes for table:

RoHS Compliant
  1. -x part number suffix (-T) threaded version or (-P) weldable post version
  2. ΔT = IRMS2 x ESR x Rca
  3. Power Density (W/kg) = 0.12V 2 / (ESRDC x mass)
  4. Maximum Energy (Wh) = ½ CV2/3600
  5. Energy Density (Wh/kg) = ((½ CV2) / 3600) / mass


ESC3000F-2.7V-CAP-x Datasheet

ESC2000F-2.7V-CAP-x Datasheet

ESC1500F-2.7V-CAP-x Datasheet

ESC1200F-2.7V-CAP-x Datasheet


ESC Ultracap Brochure

Ultracap Connecting Brackets and Attachment Nuts

Part Number
ESCCAPBKT-1 Connecting bracket for threaded terminal versions of Ultracaps
ESCCAPBKT-2 Connecting bracket for laser-weldable post versions of Ultracaps
ESCAPNUT-1 Attachment nut for Ultracaps with threaded terminals

Ultracapacitor Hardware Threaded Version Information

Energy Products Line Card

Energy Products Line Card

External Resources

Web link to interesting free paper at Wiley Online Publications:  Electrochemical Supercapacitors for Energy Storage and Conversion.
By: Brian Kihun Kim1, Serubbable Sy1, Aiping Yu1, and Jinjun Zhang2
1University of Waterloo, Waterloo, Canada
2National Research Council Canada, Vancouver, Canada