ELXM221VSN821MR40S

Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors, also known as electrochemical capacitors, are capacitors with an electrolyte, typically liquid or gel, as the energy-storing dielectric. It has an anode constructed from high surface-area aluminum foil containing an etched, foil pattern covered with a manganese dioxide paste. The oxide layer functions as the dielectric layer and the aluminum layer forms the second electrode called the anode. The electrolyte covers the anode layer and provides ions which conduct the current between the electrodes. The cathode electrode is formed by nickel-plated end caps.

The ELXM221VSN821MR40S is a type of aluminum electrolytic capacitor. It has a capacitance of 220 uF, a voltage of 35V and a temperature range of -40oC to +85oC. It has a maximum ripple current of 821 mA, a high capacitance stability and self-healing properties.

Application Field

The ELXM221VSN821MR40S is suitable for both bypassing and filtering, as well as DC-AC and DC-DC power conversions. It also offers protection against inductive kick-back voltage when used in solenoid or switch circuits. It has found use in a variety of applications, such as alternative energy systems, automotive, energy storage, motor-drive systems, switch-mode power supplies, portable medical devices and telecommunication systems.

Working Principle

Aluminum electrolytic capacitors work by creating a chemical interaction between the aluminum foil and the electrolyte. Heavily engraved lines in the anode foil provide a large surface area for the electrolyte to react with. When a voltage is applied across the device, an electric field is created in the electrolyte and ions drift towards the anode electrode, where they are stored on the surface. This process is called Faraday\'s Law of Electric Conduction. The ions will remain on the anode until the applied voltage is removed, at which point the electrolyte will return to its neutral electrochemical state. This is the working principle of an aluminum electrolytic capacitor.

In conclusion, the ELXM221VSN821MR40S is an aluminum electrolytic capacitor, making it suitable for a variety of applications. Its design enables it to store a large amount of electrical energy and also allows it to handle high currents. Its temperature range of -40oC to +85oC makes it a good choice for applications in harsh environments. It is also relatively small in size and offers good capacitance stability and self-healing properties.