ST90-125L2KI

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Tantalum capacitors are widely used in consumer and industrial electronic equipment due to their high performance and long life. ST90-125L2KI is a type of surface-mount tantalum capacitor that is designed for use in applications requiring high ripple current or low ESR performance. This article details the application field and working principle of the ST90-125L2KI.

Application Field

The ST90-125L2KI is ideal for DC-DC converters, automotive electronics, battery chargers, telecom, and backup power supplies. It is also used in power supply decoupling, energy-saving circuits, audio/video circuits, noise reduction circuits, and more. Due to its low Equivalent Series Resistance (ESR), the capacitor can reduce voltage noise and increase lifetime.

Construction

The ST90-125L2KI surface-mount tantalum capacitor is composed of a two-piece element which includes a conductive polymer inner element that is molded with a manganese dioxide outer element. The inner element functions as the positive terminal and the manganese dioxide element as the negative terminal. The electrolyte is typically a potassium hydroxide (KOH) solution.

Working Principle

The working principle of the ST90-125L2KI is based on the capacitor\'s ability to store energy. The capacitor is formed by stacking two electrolyte layers, with the outer layer formed by a manganese dioxide cathode and the inner layer acting as the anode. When a voltage is applied, an electric field is formed. The electric field causes electrons to be attracted to the anode. The electrons then move through the electrolyte layers and are then attracted to the cathode. This movement of electrons creates a field in the capacitor that stores the energy.

Performance Parameters

The ST90-125L2KI has an RMS current rating of 8.0A and an ESR rating of 0.2Ω. The capacitor has a maximum ripple current rating of13.2A, with a maximum working voltage of 16V DC. The capacitor has a capacitance of 1uF and a tolerance of ±20%.

Conclusion

The ST90-125L2KI is a high-performance, surface-mount tantalum capacitor used in a variety of applications. The capacitor is composed of a positive and negative terminal, with the negative terminal composed of a manganese dioxide outer element and the positive terminal a conductive polymer inner element. The capacitor stores energy by creating an electric field when a voltage is applied. The ST90-125L2KI has a capacitance of 1uF, with a tolerance of ±20%, a maximum ripple current rating of 13.2A and an ESR rating of 0.2Ω.

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