199D475X9016B2B1E3

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Tantalum Capacitors

The type code 199D475X9016B2B1E3 is a leaded tantalum capacitor. Tantalum capacitors are mostly used in filtering applications or coupling and decoupling circuits and offer some advantages over alternative components, particularly in power circuits and portable applications.

Tantalum capacitors are electrolytic and generally consist of a solid tantalum metal anode with a conductive oxide layer, a cathode metal casing, solid electrolyte material and two silver-plated external terminal pins. The anode and cathode can be interconnected with a convex shaped reflow window if surface mounting is required.

Tantalum capacitors can generally operate at higher temperatures and frequencies than standard aluminium electrolytic components and generally have greater volumetric efficiency due to their smaller size.

Application Field

Tantalum capacitors are widely used in military, industrial, and medical applications as well as consumer electronics, including mobile phones and laptops. They have also been used in consumer applications such as televisions, automotive electronics, audio systems and consumer digital cameras.

Tantalum capacitors can be used to filter out RF signals in RF applications such as cordless telephones and data communication systems. They are also used in the energy storage circuits of laptop computers and other portable electronic equipment.

Working Principle

Tantalum capacitors work on a similar principle to electrolytic capacitors but rely on tantalum as the electrolyte instead of aluminium. Even though the anode and cathode are made of solid tantalum metal, the oxide layer acts as an insulator, preventing current flow.

When a potential difference is applied across the pins, positive charges (electron holes) are generated in the oxide layer. These charges accumulate on the cathode side of the anode and form a space charge of negative charges. The presence of a negative charge causes an electric field which forces free electrons to move from the anode to the cathode, creating a depletion region between the anode and the cathode.

This depletion region between the anode and cathode then acts as a dielectric material, allowing the capacitor to store energy in the form of an electric field and an associated electric charge. The capacitor then continues to store (or discharge) energy until the voltage across it is equalised with that of the source.

Conclusion

Tantalum capacitors are a popular choice for applications requiring high capacitance, high frequency operation and temperature resistance. They are ideal for use in power circuits and portable applications, but can also be used in other applications such as RF filtering, energy storage and consumer electronics. The type code 199D475X9016B2B1E3 is a leaded tantalum capacitor, which implements the working principle discussed above.

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