V18MLA0805LA

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The V18MLA0805LA is a varistor, a form of voltage-dependent resistor that accommodates overvoltage protection. This varistor offers a wide operating voltage range from 3V to 1800V, making it applicable to a diverse range of applications. To understand the working principle of this component, it’s necessary to explore the science behind varistors in general.

In its simplest form, a varistor is a two-terminal nonlinear resistor element composed of special ceramic materials. It’s primarily used to protect a system from overvoltage spikes like those caused by lightning strikes or by the surge waves from motors or contacts in switching applications. When the external voltage exceeds a certain threshold, the varistor conducts the excess current away from the protected system.

Varistors work on the principle of varicap, a semiconductor diode that features a voltage-dependent capacitance. This capacitance is caused by the movement of charge carriers within the junction of the diode. When the voltage increases, the charge carriers propagate towards the junction, resulting in a decrease in the junction capacitance. This mechanism allows the varistor to act as a limiter and conduct any excess voltage away from the protected system.

Looking at varistors more closely, it becomes evident that they’re composed of a matrix of zig-zag shaped electrodes, which are connected to the two terminals. This zig-zag shape is designed to form a reversed biased diode junction when an overvoltage is applied. This junction has a large capacitance and high dielectric strength. As the applied voltage increases, the charges rush in, resulting in a lot of current through the varistor.

To understand exactly how the V18MLA0805LA fits within this technology, it’s important to consider its features and specifications. This particular varistor’s operating voltage range is from 3V to 1800V, and it can store energy up to 11J. Its peak current of 8.2A ensures it can conduct the required current away from the source.

The V18MLA0805LA is available in a SMD 0805 package, making it easy to mount on a printed circuit board. It also features a low EMI penetration level, allowing it to be used in sensitive electrical systems. Lastly, its high surge capability of up to 20kA peak current makes it suitable for a variety of high power applications.

As this component is designed to provide overvoltage protection, it is typically used in applications such as LEDs, automotive systems, and consumer electronics. It is also a great choice for PCBs as it can easily be integrated into existing boards thanks to its small size and simple mounting requirements.

In conclusion, the V18MLA0805LA is a varistor, a voltage-dependent resistor element designed to protect against overvoltage spikes. It is composed of special ceramic materials, featuring a wide operating voltage range of 3V to 1800V. The component is suitable for use in LEDs, automotive systems, and consumer electronics, and is available in a 0805 SMD package.

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