T491A105K020AT4838

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Tantalum Capacitors

T491A105K020AT4838 is a type of tantalum capacitors, which are a type of capacitors used for energy storage and conversion of electrical energy. They are generally composed of twoconductive plates, separated by an insulator, called the dielectric, which can store electric energy in the form of an electric field. Tantalum capacitors are an ideal choice for applications when a high-capacity, low-leakage, and low-ESR (equivalent series resistance) capacitor is required.

Application Field

T491A105K020AT4838 tantalum capacitors are applicable in high-voltage and high-energy storage applications. They can be used in applications requiring large capacitance values in a small-sized device, many of which have been the standard for bridging capacitors in automotive electronics and military systems. Tantalum capacitors are commonly used in power supplies, high-frequency circuits, switching circuits, and filters. They are increasingly used in consumer electronics like personal computers and mobile phones. Additionally, they are used in aerospace and military communication systems and embedded system applications for their low ESL and high power density.

Working Principle

T491A105K020AT4838 tantalum capacitors are polarized and their performance depends largely on their correct installation and use. The positive terminal of the device is indicated with a mark. The variant of the case style also indicates the polarity. Since the dielectric between the plates of a tantalum capacitor is made of tantalum oxide, it is considered a type of solid electrolytic capacitor. The oxide layer functions as the dielectric and the tantalum acts as the anode.

When voltage is applied across the capacitor, a current flows that forms a thin oxide layer on the tantalum surface. The electric field of the capacitance forces the electrons out of the capacitor plates and onto the tantalum surface to form this layer. This layer acts as a capacitor dielectric and allows the capacitor to store electric energy. When the applied voltage is removed, the electric charge also disappears, and the layer of tantalum oxide quickly reforms as the electrons return to their original positions.

This type of capacitor is a great choice for many different applications because of its low ESL and high power density. However, the relatively high temperatures at which this device can operate makes it unsuitable for use in any application where heat dissipation is a concern.

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