SCA datasheet(6/66 Pages) KEMET

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dielectric

cathode

aluminum foil

paper soaked in electrolyte

electrolyte solution

anode

aluminum foil

Extended cathode

Anode foil

Cathode foil

Tissues

Foil tabs

Aluminum electrolytic capacitor typical construction

Aluminum Electrolytic Capacitors

Aluminum electrolytics offer some of the smallest sizes for a given capacitance and voltage. Commonly

used for filtering and bulk energy storage, electrolytics are available in rated voltages exceeding 500 VDC.

KEMET Electrolytic capacitors are utilized in a wide variety of demanding power electronics applications

such as automotive, power generators and converters, welders, wind turbines, uninterruptible power

supplies, and medical imaging.

Electrolytic capacitors consist of aluminum foil which is first etched to increase its surface area. Separate,

carefully designed etching techniques are used for the anode and cathode foils. A layer of aluminum

oxide, an excellent dielectric, is formed on the surface of the etched anode foil before the foils are wound

together between special separator papers. At the same time, tabs are welded to the foils to form the

connections. The wound assembly is impregnated with a liquid electrolyte. This electrolyte is a precision-

made compound which fully impregnates the etched foil, providing a low ESR conductive path to the

cathode foil with stable electrical and chemical properties. KEMET crafts its own electrolytes to match

the etched foil characteristics and desired final properties. The assembly is packaged in such a way as

to provide excellent vibration resistance and low thermal resistance.

KEMET offers a broad line of axial, snap-in, screw terminal and miniature electrolytic capacitors;

however, it is often beneficial to optimize the capacitor to a specific requirement, particularly in

automotive and power applications. KEMET’s systems and production methods are designed with

optimization in mind. By utilizing a “library” of foils, electrolytes, separator papers, and mechanical parts

in carefully selected combinations, KEMET can swiftly design and build optimized electrolytic capacitors

to match a given specification.

SCA データシート(PDF) 6 Page - Kemet Corporation