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Tantalum Capacitors

Tantalum capacitors are electrical components used to store energy and block direct current while allowing alternating current to pass through a circuit. In comparison to other types of capacitors, tantalum capacitors are relatively small and lightweight, yet have a high capacity to store energy. When used in applications such as power supplies, radios, GPS units, and consumer goods, tantalum capacitors provide stable and reliable power for their function. A good example is the TAP156M020SRW, which is a surface mount device designed for high temperature service.

Application Field

The TAP156M020SRW is a surface mount tantalum capacitor designed for use in high temperature applications. Designed for operation up to 70°C, it is particularly well suited for applications such as automotive and avionic electronics, high-temperature circuit boards, and power supplies. It is part of a family of surface-mount polymer capacitor solutions that includes values from 10 µF to 47 µF in voltages of 4V and 6.3V. The TAP156M020SRW has a volumetric footprint of 4.4x2.4x2.4mm.

Working Principle

The working principle of a tantalum capacitor is based on capturing electric charge between two layers of material that are separated by a dielectric material. In this case, the dielectric material used is an oxide of tantalum, and the layers are made of an anode made of tantalum metal and a cathode made out of a conductive polymer, or manganese dioxide. The oxide layer provides a barrier to the electric charge, and the capacitor is able to store a greater amount of electrical energy than a standard aluminum electrolytic capacitor.

To release the charge, the voltage is reversed, which causes current to flow between the anode and cathode. The amount of charge that can be stored in the capacitor is equal to the voltage times the capacitance, with the formula being Q=CxV, where Q is the charge, C is the capacitance, and V is the voltage.

Conclusion

Tantalum capacitors are a reliable and efficient choice for many applications, due to their small size, light weight, and high capacitance. The TAP156M020SRW is a surface mount device designed for high temperature service, and is well suited for applications such as automotive and avionic electronics, high-temperature circuit boards, and power supplies. The working principle behind tantalum capacitors involves capturing electric charge between two layers of material that are separated by a dielectric material, with the charge being held by the oxide layer.

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