CWR09FC336KB

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Tantalum capacitors are a member of the larger class of electrolytic capacitors.They offer some significant advantages over other types of electrolytic capacitor, such as lowprofile packaging, large capacitance for a given size and very stable leakage.The CWR09FC336KB is a typical example of a tantalum capacitor, and as such there are many potential applications and use cases.

Application Field

The CWR09FC336KB is a general-purpose surface-mount aluminum electrolytic capacitor, meaning it is aimed primarily at applications needing relatively small amounts of capacitance, typically 380µF. This is suitable for many uses within the engineering and electronics sectors, including signal coupling filters, timing circuits and bypassing in filter or tuning circuits.

Applications might include voltage stabilization in 3V or 5V logic circuits, as a boosting capacitor in voltage multiplier circuits, ripple suppressors in switched power supplies and other power conditioning applications, e.g. as part of a regulator circuit on automotive engines.

Due to their small surface-mount package, the CWR09FC336KB is also suitable for use in modern mobile electronic devices, such as cell phones, tablets, palmtop computers and handheld gaming consoles.

Working Principle

At the simplest level, a capacitor is an active electrical device which stores energy temporarily. It works by storing electrical charge between two parallel conducting plates, and enhances or delays current when placed in an AC circuit. Tantalum capacitors work on the same principle, but using tantalum as the anode which gives it its vital characteristics.

Tantalum capacitors use a porous tantalum anode, a wettable cathode, and an electrolyte of liquid or solid state. The differences between tantalum and other electrolytic capacitors lie in the extremely thin dielectrics that form on the porous anode — usually around 0.2-2.0 µm thick — and the use of a solid electrolyte with solid tantalum. This combination leads to high volumetric efficiency, as the small size of the capacitor means higher capacitance is possible in a given volume.

On charging, current passes through the tantalum capacitor, converting the anode\'s tantalum surface into a layer of tantalum pentoxide. This layer serves as the dielectric, with electrons being trapped in the layers of the dielectric when the capacitor is disconnected from the current supply.

Because of the solid electrolyte, a brittle layer of tantalum pentoxide forms on the anode. If the voltage of the device is exceeded beyond safe limits, a brittle layer can be formed, leading to failure of the capacitor and gradual degradation of the device.

Conclusion

To sum up, the CWR09FC336KB is a typical tantalum capacitor, used in applications requiring relatively small amounts of capacitance. It works by converting tantalum into a layer of tantalum pentoxide, which serves as a dielectric, trapping electrons when the device is disconnected from the current supply. However, if the voltage of the device is exceeded beyond safe limits, then a brittle layer can be created, leading to failure of the capacitor and gradual degradation of the device.

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