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Tantalum Capacitors

T495D476M020ZTE150 is a tantalum capacitor, a type of electrolytic capacitor. It is specifically intended for use in high performance switch-mode power supplies. Though more expensive than other types of capacitors, tantalum capacitors are preferred in many applications because of their exceptional electrical characteristics and rugged construction.

Application Field

Tantalum capacitors are found in applications in which reliability and miniaturization are key concerns. Compared to other types of capacitors, such as aluminum electrolytic capacitors, tantalum capacitors have a much smaller profile and are much more reliable over time. This makes them a popular choice for applications such as switch-mode power supplies, computer memory, clock circuits, and various communications devices.

Specifically, the T495D476M020ZTE150 has a rated capacitance of 47μF, an operating voltage of 16V, and an ESR rating of 20mΩ. This makes it suitable for use in high-efficiency switch-mode power supplies, as it is capable of handling high ripple current and is very stable over time. It is not a good choice for use in low-noise audio applications, however, because of its relatively high ESR.

Working Principle

A tantalum capacitor is essentially a type of electrolytic capacitor, which is composed of two metal plates separated by an electrolyte. The metal plates are typically made of tantalum or a tantalum-coated metal, and the electrolyte is usually composed of manganese dioxide. When a voltage is applied to the capacitor, the metal plates become polarized, allowing the capacitor to store a charge. The stored charge is retrieved when the applied voltage is reversed.

The advantage of using tantalum in electrolytic capacitors is the metal’s capacitance in combination with its relatively low ESR rating. This makes it suitable for use in applications in which current must be switched quickly, as well as providing the device with greater reliability due to its improved temperature and voltage stability.

Tantalum capacitors are typically constructed in two different types, solid and wet. Solid tantalum capacitors are made from sintered powder, while wet tantalum capacitors utilize a form of electrolyte, often referred to as manganese dioxide gel, to form a solid but conductive bridge between the metal plates.

Conclusion

The T495D476M020ZTE150 is an excellent example of a tantalum capacitor, specifically designed for use in high performance switch-mode power supplies. It offers the advantages of miniaturization and high reliability over time, as well as a high capacitance and low ESR rating, making it suitable for use in applications requiring rapid current switching. As with any type of capacitor, the device is subject to physical damage or electrolytic leakage over time, and should be tested regularly.

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