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Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors, also known as alu-caps, are polarized electrolytic capacitors whose anode electrode is made of a pure aluminum foil with an etched surface. It is a kind of capacitor which features high capacitance values in small case sizes. They are mainly used in high-frequency circuits, low-rise time circuits, and for decoupling and smoothing applications.

757D278M025EN3D Application Field and Working Principle

The 757D278M025EN3D is a type of aluminum electrolytic capacitor from AVX that is housed in a miniature case style. It offers exceptional performance in decoupling, smoothing, and high-frequency applications. It is capable of operation up to a temperature of 105°C with maximum ripple current. It features a high capacitance value of 2.5 µF in a very small package size, and a low impedance.

The 757D278M025EN3D’s anode is made of a pure aluminum foil with an etched surface. This etched surface increases the electrolytic capacitor’s surface area and helps improve its capacitance value. Its dielectric consists of an electrolyte and a paper separator. The electrolyte is an aqueous solution of an alkaline salt, such as sodium, potassium or ammonium, with the paper separator helping to keep the electrolyte in a liquid form. This combination forms the capacitor’s dielectric.

The capacitor’s cathode is a layer of aluminum oxide which covers the etched surface of the anode. This layer of aluminum oxide acts as an insulating layer which blocks the flow of electric current. When a voltage is applied to the capacitor, a voltage drop occurs across the dielectric and electric current flows from anode to cathode. This current charges the capacitor and stores energy.

The 757D278M025EN3D is perfect for use in small applications such as decoupling, smoothing and high-frequency operations. Its miniature case style, low impedance, and high capacitance value make it an ideal choice for applications that require a high level of performance and reliability in a small package size.

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