B43231E2158M

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Aluminum electrolytic capacitors are broadly used in power supplies, especially of digital circuits, where their relatively low cost provides solid performance and larger capacities than other kinds of surface-mount capacitors. The B43231E2158M capacitor, in particular, is a part developed and manufactured by EPCOS-TDK suited for high temperatures and higher capacitance values. This article explores the B43231E2158M’s application fields and working principle.

Application Fields

B43231E2158M aluminum electrolytic capacitors are suitable for a range of applications in the automotive and industrial sectors, in high frequency switch mode power supplies, power amplifiers and various types of circuits. Their features make them ideal for low impedance applications, as they offer very low ESR values, high capacitance values, and long performance life.
The B43231E2158M’s print marking consists of two basic elements: its capacitance and voltage. Its capacitance ranges from 10 to 22uF, with a working voltage that ranges from 25-65V. Their load life and ripple current are very stable, making them ideal for long-term use.
Manufacturing for the B43231E2158Mhas been made accessible in 10-22uF, 25-65V. In comparison to other capacitors of its kind, its dimensions are fairly small, which allows for easy circuit construction.

Working Principle

Aluminum electrolytic capacitors are polarized electrolytic capacitors that use a chemical process within the anode material to deposit an insulating layer of oxide, which acts as the dielectric. The electrolytic capacitor consists of two electrodes, each separated by an electrolytic fluid (which usually contains ions).The anode of the B43231E2158M is formed from an aluminum foil etched with many small walls. This enables increased surface area for improved capacitance. The cathode is a formed from a layer of conductive material, typically carbon filled epoxy. When a voltage is applied to the capacitor, an electric field is created and causes an oxide layer to grow on the aluminum walls.

In an electrolyte, ions are attracted by the electric field created, and they increase the charge stored in the capacitor. The energy stored in the B43231E2158M is the sum of charges attracted by the aluminum surface and the oxide layer created. The double layer of electrodes and electrolytic fluid allows for higher capacitance values than those found in other types of capacitors. The chemical process that occurs inside the capacitor is known as electrolysis and, as the name implies, it involves the ionic movement of molecules, which results in the formation of a thin oxide layer.

The B43231E2158M uses a solid electrolyte, which provides better electrical properties when compared to a liquid electrolyte. The solid electrolyte also increases the stability of the oxidation layer, which results in improved performance over time. Lastly, its operating temperature ranges from -55°C up to +125°C, which is more than double that of other electrolytic capacitors.

Conclusion

The B43231E2158M aluminum electrolytic capacitor is an excellent choice for applications requiring high temperatures, high capacitance values, and long performance life. It is especially well-suited for high frequency switch mode power supplies, power amplifiers, automotive electronics, and various kinds of circuits. Its robust construction provides excellent stability and reliability, making it the perfect choice for many applications.

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