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Aluminum Electrolytic Capacitors

Aluminum electrolytic capacitors are one of the broadly used types of capacitors today. Capacitors are passive devices which temporarily store energy in the form of an electric field; consequently, they have a variety of purposes. The most predominant use for aluminum electrolytic capacitors is in decoupling circuits, where they’re used to filter out noise and reduce interference. As a result, aluminum electrolytic capacitors are critical components for numerous electronic system applications.

B43540B9187M87 Application Field and Working Principle

The B43540B9187M87 is a high reliability aluminum electrolytic capacitor, developed and manufactured by EPCOS. Capacitors with characteristics such as these are predominantly used for decoupling and filter applications in automotive electronics, industrial electronics, and the automotive industry; where performance is essential. Specs of the capacitor include a maximum working voltage of 10 V DC, a capacitance of 1000 µF and a peak temperature of up to 105℃.

Aluminum electrolytic capacitors involve two electrodes between a paper separator, wherein a thin aluminum oxide layer acts as an insulator and the electrolyte is absorbed through the oxide. The positive electrode charges throughout a tremendous electric field created in the exceedingly slim oxide layer, which is highly porous. This positively charged electrode creates an electric field with the negatively charged electrode, on the other side of the oxide layer, thereby storing electrical charge.

As capacitors, such as the B43540B9187M87 are polarized, one has to be mindful of the directions of current flow when connecting the device. As the electric flow is blocked with the reversed connection, the oxide layer can build up undesired pressure, which can cause the device to fail.

Highly reliable aluminum electrolytic capacitors, such as the B43540B9187M87, must go through a pre-screening process, and their performance must be assessed in severe environments. Fulfilling tests such as voltage proof, pressure deformation (bond test) and solderability tests, the B43540B9187M87 falls under the category of qualified aluminum electrolytic capacitors and is highly recommended for decoupling and filter circuits. Its attributes include high heat resistance, reliable self-healing property, and high ripple accumulation.

Uses

As previously noted, aluminum electrolytic capacitors are predominantly used for decoupling and filter applications, as they serve to filter out noise and reduce interference. The capacitors main purpose is power supply circuit smoothing. These capacitors also play an integral role in rectifier circuits; as they are used to rectify and stabilize the voltage and reduce any ripples. Additionally, aluminum electrolytic capacitors can be used in low-pass filters, which reduce the amount of high frequency signals; and to decouple the high-frequency speaker input signal from the low audio signal.

Due to their construction, aluminum electrolytic capacitors tend to have a greater capacity and higher working voltage than other types of capacitors, making them a renowned choice for multiple applications. However, as outstanding as these components are, they are vulnerable to various stresses, such as ambient temperature and ripple current. As a result, it is essential to select the ideal capacitor for your application, to ensure that it’s functioning correctly and safely.

Conclusion

The B43540B9187M87 is a high reliability aluminum electrolytic capacitor, which are commonly used in multiple applications such as decoupling and filter circuits; where performance is fundamental. Designed for an utmost working voltage of 10 V DC, a capacitance of 1000µF and a peak temperature of up to 105℃, aluminum electrolytic capacitors are lauded for their high heat resistance, reliable self-healing property, and high ripple accumulation. Although outstanding and reliable, these capacitors also be vulnerable to stress and have to be accurately selected, and connected, for optimal performance and safety.

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