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Tantalum Capacitors

A tantalum capacitor is a type of electrolytic capacitor, an electronic component which uses the unique combination of chemical and physical properties of tantalum to provide extremely high capacitance values over a very small volume. The CWR11FC685KB is a tantalum capacitor which consists of conductive anodic oxide layer and capacitor grade of tantalum powder. The architecture of this type of capacitor is relatively complex and involves oxide, which acts as a dielectric material. The tantalum capacitor also offers a high temperature performance, excellent stability, and a good frequency response.

Application Field

Tantalum capacitors are typically used in demanding applications. Their main applications include the stabilization of high voltages in the automotive sector, the derating of input supply voltages in the telecommunications industry, voltage conversion in servers, and pulse energy applications in industrial systems, among others. The CWR11FC685KB has been designed to meet a range of application needs including filter capacitors, bypass capacitors, decoupling capacitors and high frequency. In the automotive sector, for example, the capacitor’s ability to handle high temperatures and high ripple current, as well as its small size and lighter weight, make it ideal for use in electronic power steering systems, brakes, and stability control.

Working Principle

The CWR11FC685KB is a wet tantalum capacitor, meaning it is based on a tantalum electrolyte, which is an aqueous solution that is placed between the two electrodes. When a voltage is applied across the capacitor, ions migrate towards the opposite plate, where they are deposited, thus forming a conductive solid layer. This deposits the electric charge, storing energy. The process continues until equilibrium is reached, at which point the chemical reaction occurs and electric charge is discharged.

The CWR11FC685KB also operates on the principle of electrochemical capacitance. Electrochemical capacitance occurs when ions from the electrolyte solution form a layer of charged particles on the surface of the capacitor. These ions form a conductive layer which is able to effectively store electric charge and release it again when the electric field applied to the capacitor is reduced. The amount of charge stored in this layer relies on the electrochemical properties of the electrolyte solution.

Conclusion

The CWR11FC685KB is an example of a tantalum capacitor which exploits the excellent capacitance and stability of tantalum. The capacitor is designed for a wide range of applications in harsh environments and can withstand temperatures of up to 125°C. The operating principle of the capacitor is based on electrochemical capacitance, which relies on the ionic transfer of electric charge in the electrolyte solution between the two electrodes.

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