V39MT2A

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TVS - Varistors, MOVs, are devices designed to protect electrical circuits from overvoltage transients caused by surges, spikes, electrostatic discharge (ESD) and Lightning. The V39MT2A is a member of this family of varistors and is specifically designed for use in a variety of electronic equipment including consumer, computer, communication and automotive applications. This application notes provides information about the basic components, general construction and working principle of the V39MT2A.

The V39MT2A is a silicon-carbide based varistor consisting of a discrete monolithic structure. It has a typical clamping voltage of 708V and a response time of 0.2 μs. It is available in an SOD-123 package or in a flattened or radial version for through-hole mounting. The advantage of the SOD-123 package is that it has a low profile and can be used in smaller devices.

The V39MT2A is based on the homogeneous dopant distribution, which is manufactured by the ion implantation process. This refers to burying the dopants into the dielectric layer of the component in order to complete the MOSFET type built-up structure. The component contains two distinct regions: a conduction or depletion layer and an accumulation layer. The conduction layer is realized by the p-type dopants and is the primary switching mechanism of the V39MT2A. When the clamp voltage is exceeded, the depletion layer is formed which imparts the electrical current into the Varistor and enables the voltage clamping.

The conduction layer of the V39MT2A is formed with multiple layers of silicon-carbide crystals which act like a rectifying diode with two terminals. The main terminal is connected to the negative side and the anode is connected to the positive side. When an external voltage exceeds the clamp voltage, the V39MT2A begins to conduct current between the two terminals. This current is then rectified by the silicon carbide crystals and is dissipated as heat.

The working principle of the V39MT2A involves two main aspects. Firstly, its voltage avoidance switch prevents excess voltage from passing through the device. Secondly, its current-limiting feature keeps the current under a certain limit. This is accomplished by the built-in zinc blendes, which prevent higher current from passing through. The two together keep the excess voltage from passing through the component and the current under control.

The V39MT2A is primarily designed to protect electronic equipment from overvoltage transients. It is also useful in providing reverse voltage protection, ESD immunity, UV protection, and lightning protection. It is used in numerous consumer, communication, automotive, and computer applications. The low profile of the SOD-123 package makes it suitable for electronic equipment with small footprints. Moreover, it can be used in combination with other components in order to provide the most effective protection.

In conclusion, the V39MT2A is a high performance and cost-effective solution for protecting electronic circuits from transient voltages. It is compact, fast, and reliable and is ideal for use in a variety of applications. Its homogeneous dopant distribution and current-limiting feature enable it to provide reliable protection against transient voltages. It is available in several packages with different clamp voltages, response times, capacitance values, and power ratings.

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