T491B105K035AT Capacitors

Tantalum Capacitors

Tantalum capacitors have become an indispensable part of modern electronic technology, offering a wide range of applications from signal processing and signal conditioning to circuit protection and DC-DC power supply management. In particular, the T491B105K035AT series of tantalum capacitors, developed by Vishay, is specifically designed for applications that require high reliability and long service life in extreme environments.

Application Field

The T491B105K035AT series of tantalum capacitors are perfect for use in power management circuitry, such as in DC-DC voltage and current regulators, DC-to-DC convertors, switch-mode power supplies, and boost and buck-boost circuits. The capacitors also find uses in high-performance audio equipment, instrumentation, and medical electronics. These capacitors are also suited for use in computers and other electronic appliances, and can even be used in broadcast and other RF applications.

Working Principle

Tantalum capacitors are polarized aluminum electrolytic capacitors and contain two pairs of electrodes. The anode, or positive terminal, is manufactured from a high-permittivity sintered tantalum anode, which may or may not be contained in a polymer sleeve. The cathode, or negative terminal, is formed using a coated Niobium powder. This combination of materials creates a very high capacitance value and results in extremely low leakage current and good temperature stability.

The principal working principle of the tantalum capacitor is similar to that of any other polarized aluminum electrolytic capacitor. A voltage, typically of AC or DC, is applied across the two electrodes, which, depending on their design, either creates or blocks a flow of charge through the capacitor. This creates a difference in electrical potential which is proportional to the magnitude of the applied voltage.

When the capacitor is used for signal filtering, the impedance of the device is essentially determined by the product of the applied voltage and the capacitance, resulting in an impedance that is proportional to the product of the two parameters. This impedance can, therefore, be adjusted by changing the value of the applied voltage or the value of the capacitance.

Conclusion

The T491B105K035AT series of tantalum capacitors from Vishay is a powerful, reliable, and cost-effective solution for a variety of applications, and is suitable for use in a wide range of systems, including power management, audio, instrumentation, medical electronics, computers, and broadcast and RF electronics. The power of these capacitors is due to their high permittivity sintered tantalum anode and coated Niobium powder cathode, resulting in high capacitance values, extremely low leakage current, and good temperature stability.