T491D476M020AT7280

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T491D476M020AT7280 is a type of tantalum capacitors. It is a type of electrolytic capacitor and is often used in applications that need a large amount of energy to be stored in a small volume. Tantalum capacitors are widely used in the circuit design of aircraft, automotive, and other high-reliability applications, due to their small size, high energy density, and general performance.

The T491D476M020AT7280 is an axial-leaded electrolytic capacitor with a 5.6V working voltage. It has an operating temperature range of -55℃ to 125℃, and is conformally coated. The unit features a 20% capacitance tolerance and a 4V.DC withstand voltage on the hermetically sealed case.

The T491D476M020AT7280 capacitor provides high energy density in packages as small as 4.1mm in diameter and 4.6mm in length. It is ideally suited for military and commercial applications that demand reliable signal transmission, signal filtering, and blocked current applications. The capacitor also has a high stability and low ESR, making it advantageous in the power supply filters. The shelf life of the T491D476M020AT7280 capacitor is approximately 25 years, offering reliability and extended life in harsh environment applications.

Typically, the basic working principle of tantalum capacitors is the same as other types of capacitors. Electrical charge is stored in an insulator between two conductors, separated by a dielectric material. The difference between tantalum and other types of capacitors, is that tantalum capacitors use a tantalum material as the dielectric instead of ceramic, plastic, paper, or mica. Tantalum’s dielectric properties allow it to not only store more energy, but also to require less power and be more efficient than other capacitors.

The way the electrical energy is stored in a tantalum capacitor is as an electrochemical system. The anode of the capacitor is a sintered material composed of tantalum pentoxide, and the cathode is a film of manganese dioxide. When the electrical charge is applied, the ions from the electrolyte are attracted to the surface of the anode and form an electric double layer. This electric double layer stores the energy on the capacitor’s surface. Once the capacitor charges, the dielectric barrier that has been created prevents the electrostatic discharge of the stored energy.

The outer casing of the T491D476M020AT7280 capacitor is made of aluminum and is hermetically sealed to ensure its reliability in difficult or extreme environments. The internal construction of the bead consists of an anode, electrolyte and the internal leads. There are also solid-polymer capacitors available, which use a solid polymer instead of a liquid electrolyte. The solid-polymer construction provides improved temperature and transportation stability in comparison to traditional liquid electrolytic capacitors.

The T491D476M020AT7280 tantalum capacitor is ideal for applications that require reliable, high-density energy storage in a small package. It is suitable for use in vibration-resistant, surface-mount board applications, aerospace, and other high-reliability industries. The hermetically sealed case ensures improved stability, and the solid-polymer construction provides improved temperature and transportation stability in difficult environments.

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