SMOV34S421MP

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TVS - Varistors, MOVs are among the diverse circuit protection components in the electrical industry. Their primary purpose is to protect above board level components from damaging external electrical surges. In this article we will discuss the specifics of SMOV34S421MP, one of the most effective devices of this type, including its application field and working principle.

The SMOV34S421MP is a unidirectional bidirectional dual-row UltraMOV device, designed to provide surge protection from current, voltage, and energy spikes. With a size of 34mm x 21mm, it is capable of dissipating up to 25A of instantaneous current. This surge protector’s clamping voltage is 440V at 25A, and its maximum sustained voltage is 250V. It also offers a wide operating temperature range and high reliability.

The SMOV34S421MP employs a unique patented design that provides superior protection from overvoltage, while simultaneously maintaining a low capacitive impedance. This makes the device particularly effective for protecting low-voltage circuits and high-speed signaling applications. It also provides repeatable, consistent performance regardless of the environment. Additionally, its wide operating temperature range and high reliability make it an ideal choice for energy- and cost-sensitive applications.

The working principle of the SMOV34S421MP is quite simple. It consists of a pair of varistors connected back to back, so that any high-energy surges are completely absorbed by the device. When the device is in its normal, unenergized state, it acts as an open circuit, allowing current to pass freely. However, when a surge above a certain threshold occurs, the varistors begin to conduct, causing the device to act as a short circuit, thus preventing any further current from flowing through it. As the current dissipates, the device reverts to its unenergized state.

The SMOV34S421MP’s comprehensive protection makes it an ideal choice for a wide range of applications, including data and telecommunications, automotive, and consumer electronics. In data and telecom applications, its superior protection from current and data rate surges ensures reliable communication. In automotive applications, the device helps protect vehicle components from power spikes due to lightning strikes and other sources. And in consumer electronics, it helps protect sensitive components such as LCDs and LEDs from voltage surges.

In summary, the SMOV34S421MP is a high-performance surge protector that offers superior protection from voltage and current surges. It employs a unique patented design and a wide operating temperature range to provide reliable performance over a variety of applications. Additionally, its small size and low capacitive impedance make it an ideal choice for energy- and cost-sensitive applications. As such, it is one of the most effective devices for protecting above board level components from damaging electrical surges.

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