T491D226M020AT4280

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Tantalum Capacitors

The T491D226M020AT4280 is a type of capacitor, specifically a tantalum capacitor, also known as a tantalum electrolytic capacitor.

Application Field

Tantalum capacitors are most commonly used in portable and battery-powered electronics, such as smartphones and laptops. They are also used for filtering, coupling, and bypassing applications in electronic devices.

Tantalum capacitors have the advantage of low resistance and high capacitance, making them well-suited for use in high-frequency switching applications and power supplies. They are also available in a variety of capacitance ratings, from 1 microfarad to 470 microfarads, and voltage ratings from 4 volts to 50 volts.

Tantalum capacitors are also well-suited for use in harsh environments, such as in automotive, aerospace, and military applications, due to their excellent stability and reliability. They are insensitive to temperature and humidity, and do not suffer leakage or electrical shorting over the normal life of the capacitor.

Working Principle

Tantalum capacitors employ a small piece of tantalum metal as an anode, typically in the form of a pellet or a wire, surrounded by an electrolyte. A cathode is connected to the anode and a dielectric material is sandwiched between the two.

When a voltage is applied across the anode and cathode, particles in the electrolyte are attracted to the anode. These particles form a thin film on the anode surface, creating a conductive layer known as the dielectric. The thickness of the dielectric is directly proportional to the applied voltage.

This capacitance is the part of the capacitor that allows current to flow through it. As current passes through the capacitor, the dielectric layer is charged and acts as a frequency filter, allowing high-frequency signals to pass freely, while blocking out low-frequency signals.

When the capacitance of the capacitor is exceeded, the dielectric layer begins to break down, reducing the capacitance of the capacitor. This is known as capacitance loss and is usually associated with increased temperature, increased voltage, and excessive usage.

Tantalum capacitors are highly reliable and have a long service life, but they also need to be used with caution as they are sensitive to excessive voltage and heat. If used improperly, they could cause short circuits and damage other components in the circuit.

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