ESMQ421VSN471MR40S

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Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors are electrical components used for coupling and decoupling signals, filtering noise, storing charge, and controlling timing. They are composed of two aluminum foil electrodes separated by a dielectric oxide layer, and are some of the most widely used capacitors available. Aluminum electrolytic capacitors are generally rated in terms of their capacitance and other parameters like ESR, ripple current rating, and pulse duration rating.

ESMQ421VSN471MR40S Application Field and Working Principle

The ESMQ421VSN471MR40S series of aluminum electrolytic capacitors are designed for a wide range of applications, including in motors, drives, power supplies, switch mode power supplies, wind turbines, and more. They feature an improved working voltage of up to 85°C by using special electrolyte solutions and a proprietary rubber sealing process.

The working principle of an aluminum electrolytic capacitor is based on the Faraday law of electrolysis. When the electrodes of an aluminum electrolytic capacitor are connected to an applied voltage, a migration of ions occurs from the electrolyte solution to the oxide layer. This layer acts as an insulator, preventing current flow within the capacitor.

This migration of ions creates an electric field between the two layers of oxide, which is proportional to the applied voltage. The electric field creates an electrostatic charge, which builds up until it matches the applied voltage. When the electric charge reaches a certain level, the current flow between the capacitor\'s terminals is limited. The accumulated charge remains constant for as long as the applied voltage is kept constant, allowing it to act as a resistor.

The capacitance of these devices is determined by the size and shape of the electrodes, as well as the dielectric properties of the oxide layer. Generally, larger electrodes with higher dielectric constants result in higher capacitance values. Additionally, the ESR of an electrolytic capacitor depends on its structural parameters, as well as the density of its electrodes.

The ESMQ421VSN471MR40S series of aluminum electrolytic capacitors have a temperature range of -40°C to +85°C and a high working voltage of up to 420V. They feature a ripple current of up to 7.8A and a long life cycle of up to 30,000 hours. These capacitors are ideal for applications requiring a high level of reliability and performance.

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