T491B227M004AT Capacitors

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Tantalum Capacitors

Tantalum capacitors are a type of electrolytic capacitor mainly composed of tantalum. The capacitors consist of a tantalum anode, an electrolyte, and a tantalum dioxide dielectric. The anode is typically a sintered, porous anode formed with a powdered metal mixed with a binder that is capable of being formed into a sheet of desired shape, and then sintered. The dielectric is a layer of tantalum pentoxide and the electrolyte is usually a solution of a manganese salt and an aqueous solvent.

The T491B227M004AT is a radial leaded SMD tantalum capacitor, 0805 (EIA2012) package size, distributed by Kemet. It is designed for use in computer, consumer, and industrial applications. The capacitor has a temperature coefficient of -30/+85 (+/-10%) and a capacitance tolerance of 10%. It also has a voltage rating of 4V and an operating temperature range of -55/+125°C.

Working Principle

Tantalum capacitors work by using a thin layer of metal oxide, known as the dielectric, to store electrostatic charge generated by the application of a voltage between the two metal (anode and cathode) plates suspended in the dielectric. The dielectric stores the charge until the applied voltage is removed, thereby allowing the capacitor to act as a device for storing electrical energy.

A tantalum capacitor works by forming a thin layer of tantalum pentoxide (Ta2O5) on the surface of the anode, which acts as a dielectric layer. This dielectric layer stores the electrostatic charge generated by the application of a voltage between the two metal (anode and cathode) plates. The capacitance of the device is determined by the thickness of the dielectric layer, the area of the plates, and the permittivity of the material.

Application Field

The T491B227M004AT is a surface-mounted, radial leaded tantalum capacitor, which is mainly used in consumer, computer, and industrial applications. Due to its ease of assembly and reliability, this device has become a popular choice of capacitors in difficult-to-assemble environments such as cell phones, portable electronics and power tools.

The capacitors are widely used in many applications such as frequency filtering, oscillator coupling, and timing circuits. The T491B227M004AT is an especially great choice for high-noise, high-ripple frequency applications, due to its expansive capacitance range and low Equivalent Series Resistance (ESR), making it an ideal choice for many noise-sensitive circuitry requirements.

The capacitor is also suitable for high-temperature environments with its -55/+125°C operating temperature range, making it a good choice for avionic, defense, and automotive applications.

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