6TPE470MAZU Capacitors

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Tantalum - Polymer Capacitors

The 6TPE470MAZU is an example of a tantalum-polymer capacitor, which combines a tantalum anode and a polymer cathode to combine the advantages of both technologies, making a capacitor with higher capacitance than a standard tantalum capacitor. This type of capacitor is ideal for applications that require high capacitance, high temperature operation, low impedance and low ESR (equivalent series resistance).

Application Field

Tantalum-polymer capacitors are most commonly used in applications that require very large capacitance values within a small size. For instance, they are commonly used in decoupling applications, where large currents and small voltages are involved. These capacitors are also suitable for use in applications with high thermal shock, high vibration, and/or high temperatures due to their relatively low cost and reliable operation. Additionally, tantalum-polymer capacitors are used in automotive electronics, military systems, desktop computers and other high-end electronics.

Working Principle

A tantalum-polymer capacitor is constructed from two elements: a tantalum anode and a polymer cathode. The anode is made from finely divided tantalum particles that are compressed together to form a thin film. The thin film acts as the dielectric for the capacitor, providing a high capacitance rating. The polymer cathode is typically made from a conductive organic material such as polyethylenimine (PEI) or polypyrrole (PPy). The anode and cathode are separated by a thin layer of an electrolyte, which is responsible for capacitor charging and discharging.

When a voltage is applied across the terminals of the capacitor, an electric field is formed across the anode and cathode, causing a current to flow. This current is responsible for charging the capacitor, and can be seen as a buildup of positive ions at the anode and negative ions at the cathode. As the voltage across the capacitor increases, the number of ions also increases, leading to an increase in capacitance. When the voltage is removed, the ions are neutralized, causing the capacitor to discharge.

Tantalum-polymer capacitors are ideal for applications that require large capacitance values in a small size. They are also advantageous due to their low ESR and low impedance, as well as their high temperature and shock resistance. In addition to these advantages, tantalum-polymer capacitors are also relatively inexpensive and are widely available.

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