687ULR4R0MFH

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Aluminum - Polymer Capacitors

Aluminum - Polymer capacitors, also known as 687ULR4R0MFH capacitors, are used for long-term power supply due to their low impedance and low equivalent series resistance (ESR). They are constructed using many thin layers of a conducting polymer dielectric material, such as polyethylene, sandwiched between two doubly-folded sheets of aluminum foil, making them a type of aluminum-polymer hybrid capacitor.

Application Field

These capacitors are mainly used in automotive and industrial applications, such as electric vehicles, inverters, solar panels and wind turbines. Additionally, 687ULR4R0MFH capacitors are also used for the power conversion and regulation of low voltages, such as in smartphones and notebooks. They are well suited for DC-DC converters which require high ripple currents and have very low ESR, making them a great choice for reducing system losses. Due to their superior self-healing property, 687ULR4R0MFH capacitors are also remarkably reliable.

Working Principle

The working principle of aluminum-polymer capacitors is based on the principle of charge capacitance, meaning the electrodes of the capacitor can store an electrical charge. The electrostatic force between the electrodes creates an electric field, which opposes the flow of electric current. The capacitance is proportional to the surface area of the two electrodes and the distance between them.

The aluminum-polymer capacitor also has a dielectric layer between the electrodes, which helps to reduce or stop the flow of current between them. The dielectric layer further increases the capacity of the 687ULR4R0MFH capacitor. The thickness of the dielectric layer is directly proportional to the capacitance of the capacitor. Additionally, the size and shape of the capacitor also affects its capacitance.

Advantages

The main advantages of aluminum-polymer capacitors are their low ESR, low temperature coefficient, high capacitance and high temperature stability. Additionally, they also have very less series inductance and don’t require any external components to reduce noise. They have a long life cycle, robust form factor and no need for extra cooling components. These capacitors can be found in both leaded and surface-mount form, making them very suitable for a variety of applications.

Drawbacks

However, using aluminum-polymer capacitors also comes with a few drawbacks. They are more expensive than other capacitor types, because of the use of thin layers of conducting polymer in their construction. Additionally, aluminum-polymer capacitors are not suitable for high-frequency applications, as the induced voltage can produce partial discharges when applied to AC signals.

Conclusion

In conclusion, aluminum-polymer capacitors are a great choice for low-voltage applications due to their low ESR, high capacitance, and long life cycle. They are ideal for reducing system losses and long-term power supply due to their robust form factor and low series inductance. However, the use of aluminum-polymer capacitors comes with a few drawbacks such as their high cost and partial discharges if used for high frequency AC signals.

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