T491B475K020AH

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Tantalum capacitors, also known as tantalum electrolytic capacitors, are capacitors that use tantalum metal for the anode. They are made of tantalum powder pressed into a pellet, sintered and anode and cathode contacts are electroplated. They are miniature, low profile, and high capacitance components utilized in a variety of consumer electronics and industrial applications.

The T491B475K020AH is a tantalum capacitor, which is ideal for applications requiring high capacitance, low profile, and a high voltage rating. It offers a capacitance of 475K and a voltage of 20 VDC. It is a surface mount device, with a current rating of 3 amp, and comes in a case size of 4.1mm x 6.1mm.

T491B475K020AH capacitors offer excellent energy storage and leakage features due to its high dielectric strength. In addition, it has a low ESR (Equivalent Series Resistance), thus making them well-suited for low-frequency power supplies and high-frequency switching applications. The unique construction of tantalum capacitors allows them to be rated for high ripple currents, which enable the user to achieve higher energy storage compared to other types of capacitors.

Tantalum capacitors have a wide application field in many different electronic circuits. These capacitors are typically used for noise reduction, filtering, voltage regulation, decoupling, and energy storage. Additionally, they are excellent for high frequency switching applications such as PCMCIA cards and CPU voltage regulation circuits as they offer high capacitance, high reliability, and efficiency.

The working principle of a tantalum capacitor is very simple. Inside the device, positively charged ions of the anode material, such as tantalum, counterbalance the negatively charged electrons in the cathode material. When an external voltage is applied on the anode and cathode, an electrical field is formed. This field induces a large current flow between the two electrodes, resulting in a small charge transfer across them. This charge transfer creates a capacitor effect that stores energy inside the device.

When the external voltage is removed, the capacitor will retain energy until the electrical field inside the device is weakened by the charge depletion. This depletion of energy is caused by the depletion of the anode material, which causes the capacitance to decrease. Therefore, when the capacitor is fully discharged, its capacitance will be zero.

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