About Evans Capacitor                 ISO9001:2008 CERTIFIED             cert

Evans Capacitor manufactures high energy density capacitors for demanding defense and aerospace applications. Typical applications replace standard military capacitors, or augment batteries and power supplies where size, weight, reliability and quality are important factors of component selection. Evans maintains the highest levels of quality, and is ISO 9001 and AS9001 registered.
Quality & Compliance

RoHS compliance

E 2D photo
Hybrid Capacitors provide high current pulse capability for the advanced phased array radar systems on the E 2D

Evans is ITAR registered, supplying mission critical components to every major defense and aerospace company in the USA. Hermetically sealed Evans Hybrid Capacitors have numerous patented features that provide demonstrated advantages over standard capacitor technologies. Hybrid capacitors are EAR-99 for export.

Evans' production facility, located in East Providence RI, and Sanford ME, USA follow the most stringent guidelines for quality and performance. All Evans capacitor products undergo extensive testing and evaluation. Evans staff consists of engineers, scientists and technicians with many years of experience in high energy density capacitors, always available to work with specific applications or new uses for these devices.

Evans welcomes the opportunity to work with engineers and product designers to see how Evans' advanced capacitors might offer the perfect fit (and competitive advantage) we all strive for.

The high power density
                                            and high energy density
                                            Capacitors for avionics,
                                            pulse radar, and laser apps
Evans Hybrid and Capattery Capacitors are qualified in many new avionics systems like ARROWHEAD MTADS/PNVS for Apache.

Hybrid capacitor technology was licensed to Wilson Greatbatch, producers of the world's leading capacitors for implantable defibrillators.


Our products are electrolytic-electrochemical Hybrid Capacitors and Capattery® electrochemical capacitors.

Hybrid capacitors have extremely high power density, unbeatable for pulse radar and laser applications. With high energy density, Hybrid capacitors are also well suited for bridge power or bus power interruption buffers.

The Capattery has high capacitance at 5.5V and 11V with full +85°C life performance providing the only supercapacitor capability for memory back-up in defense electronics.

HyCap is the proven Hybrid Technology packaged in the standard wet slug package for DSCC 93026 and DSCC10004. HyCap delivers better performance at all temperature operating conditions, up to 200C, and higher extended cap ratings.

Shock hardened models of both Hybrid and Capattery are available for high impact shock environments like missile fusing and penetrator weapon applications.


Hybrid capacitors provide very high power and energy from devices much smaller and lighter than electrically equivalent tantalum wet, tantalum chip, or aluminum electrolytic capacitors.

Hybrid Capacitors save weight, volume and cost when compared to other military tantalum wet or aluminum electrolytic capacitors.

The Hybrid capacitor combines a high voltage electrolytic type anode bearing a Ta2O5 dielectric with a low voltage, high energy density electrochemical supercapacitor RuO2 cathode. Unlike other supercapacitors, use of the dielectric permits higher voltage operation of single cells. Thus, the Hybrid capacitor can operate at higher voltages without the need for series connected cells.

The resistance (ESR) of single cell Hybrid capacitors is much lower compared to other supercapacitors of similar voltage rating. This leads to a very low time constant of 1ms, or less, making Hybrid capacitors well suited for high-rate applications. Hybrid capacitors are available with voltages up to 125V in a variety of standard configurations and capacitance ratings. Hybrid capacitors are also available in custom configurations and ratings for specific customer requirements.

Hybrid Capacitors are available in
a number of standard configurations and
ratings from 10V to 125V



The advantage of the Capattery in defense electronics is its resistance to environmental conditions that destroy other supercapacitors. With its welded tantalum case and the unique Permselective™ valve, the Capattery can survive military environmental conditions for a lifetime of use. Capatterys are available in standard configurations under DSCC Dwg. No. 92001. Custom units and packaging are also available.

RES 160504 Shock hardened Capattery
16V  0.5F for high Shock / Impact


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