EKXJ251ELL221MMN3S

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Aluminum electrolytic capacitors are widely used electronic components, which consist of an anode aluminum foil, a porous oxide film on its surface, and wound with a wound paper or a film as a cathode. The electrolyte between them is an aqueous solution of an electrolyte, usually containing aluminum chloride and fluoride. Aluminum electrolytic capacitors have many advantages, such as high capacitance, small size, low cost, large current rating, and long life. EKXJ251ELL221MMN3S is a type of aluminum electrolytic capacitor.

Applications

The EKXJ251ELL221MMN3S aluminum electrolytic capacitor mainly applies in AC output filter of power supplies, power conversion circuits, SMPS circuits, AC adapters, and also others, such as audio circuits, automotive circuits, inverters, and high frequency systems. The EKXJ251ELL221MMN3S specially applies to high-capacity output filter circuits that require high reliability, and high ripple current capability.

Working Principle

The working principle of EKXJ251ELL221MMN3S aluminum electrolytic capacitor is based on the principle of a reversible reaction of electrode oxidation-reduction occurring at the anode aluminum foil and its corresponding oxide film. The oxidation reaction of the aluminum releases electrons in the circuit, and the charged electrolyte at the anode and cathode forms the basis of the capacitor. When the capacitor is energized, electric field lines build up between the plates as electrons collect at the anode. These electric field lines create a voltage potential across the capacitor, which causes current to flow. Upon discharging, the current stops when electrons have been transferred to the anode.

Design and Construction

The EKXJ251ELL221MMN3S aluminum electrolytic capacitor is a cylindrical component made from an aluminum housing with an electrostatic cover. Inside the housing is a rolled-up anodicized aluminum foil with a liquid electrolyte, which works as an anti-corrosive agent. The aluminum foil is encapsulated with a highly insulating polyester film for robustness and electrical insulation. Its high-capacity, low-loss, high-reliability, and high ripple current capability are due to its capacitor plates’ design and construction.

Safety and Maintenance

The EKXJ251ELL221MMN3S aluminum electrolytic capacitor has a clear and precise leakage current limit, determined by its design and construction. The capacitor should be handled with care as it can injure or cause electrical shock to the user because of its high energy requirement. Its maintenance relates mainly to cleaning, replacing, and properly storing the capacitor.

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