VE1812K601R035

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TVS – Varistors, MOVs are electronic components that regulate and provide protection from electrical spikes or surges. The VE1812K601R035 is an example of this type of component and the focus of this article will be to explore its application fields as well as its working principle.

The VE1812K601R035 is a ceramic in-line voltage limiting device that provides overvoltage protection against transients. It is rated at 600V AC (3kA for 10/1000μs pulse withstand) and is offered in surface mount and radial leaded versions. It features an internally coated epoxy body, integrated varistor element, and external leads. It is a non-linear component which essentially acts to control the flow of current. It has a wide operating temperature range of -40°C to +125°C, high surge capability, and low voltage clamping with excellent clamping performance regardless of operating temperature.

This component is widely used where transient protection is needed including automotive, telecom, and consumer electronics. In automotive applications, it is used for fuel pumps, power steering, lights, radar, navigation systems, and brakes, among others. For telecom purposes, it is used in various telecom equipment such as line cards, IP telephone networks, modems, and datacom systems. In consumer electronics, it is used as surge protection for various electronics like display panels, audio/video systems, and digital video disc players.

In terms of operating principle, the VE1812K601R035 is designed to limit the voltage that is applied to the device. The component has an impedance characterized by a "U-Shaped" curve that will intercept and dissipate an applied surge. Under normal conditions, an insignificant current is passed through. However, under overvoltage conditions, a large amount of current is sunk, thus resulting in voltage limiting. This is done by allowing a heavy current to flow through the device which causes the voltage spike to drop.

The working of the component is divided into two distinct stages. The first stage is the non-linear absorption region. Here, the voltage drops sharply due to the current absorbed by the component. This allows any additional surge to be dissipated quickly without causing further devices to be affected. This also prevents stress on connectors as it sets a limit on the amount of power that can pass through.

In the second stage, the component acts as an open circuit. This is due to the reverse voltage, which is now greater than the clamping voltage, resulting in the component opening up. This allows the generator of the transient to be cut off and no additional surge will be allowed to pass through.

In conclusion, the VE1812K601R035 is a versatile and effective in-line voltage limiting device that is used in many different industries. Its clamping performance remains excellent regardless of temperature and works in two distinct stages to limit voltage and dissipate power in the event of a high voltage spike.

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