T491A155K016ZT7280

T491A155K016ZT7280, also known as polytan or polytantalum capacitors, is a type of tantalum capacitors which typically make use of an oxide-based electrolyte. Polytan capacitors offer higher energy efficiency and are used in many industrial, commercial, and consumer applications. To understand their purpose and working principle in greater detail, let us first take a closer look at their application fields and working principles.

Application Field

T491A155K016ZT7280 capacitors are commonly employed in high-frequency circuits that are used for radio frequency transmission and reception, power management circuits, and switching power supplies. Other applications include active filters, digital-analog converters, clock oscillators, voltage converters, and power systems. These capacitors are also used in computers, televisions, and other consumer electronics because they have a very low ESR and can operate over an extended temperature range.

Working Principle

Unlike conventional ceramic or electrolytic capacitors, polytan capacitors employ an oxide layer to form a dielectric barrier between two metal layers. This oxide layer has a much higher dielectric constant than other materials, allowing the capacitor to achieve a high capacitance-to-volume ratio when compared to other types of capacitors. When two metal layers are connected, with the oxide layer establishing a dielectric barrier between them, an electric field is created. This field stores electricity in the form of an electrostatic charge, and can be tapped into when an external electric potential is applied to the metal terminals of the capacitor. This is done through a process known as dielectric absorption, in which the electric field collects electric charges and stores them. When an electric potential is applied across the terminals, the capacitor acts as a current source, releasing its stored electric charge. As the capacitor discharges, the electric field weakens, and the capacitor gradually runs out of charge until the electric field can no longer be sustained.

Conclusion

T491A155K016ZT7280 capacitors are used in many applications for their low ESR, handling of high-frequency currents, small sizes and ability to operate over wide temperature ranges. To take advantage of these properties, the capacitors use an oxide layer as a dielectric barrier between two metal layers, enabling them to achieve a high capacitance-to-volume ratio. Through a process known as dielectric absorption, the capacitor collects electric charges and then releases them when an electric potential is applied across its terminals.