V390RA8 Circuit Protection

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TVS - Varistors, MOVs are essential components of EMC protection that have been widely used in all kinds of circuit boards for decades. In recent years, more and more companies have started to focus on the development of new, improved designs that offer superior performance. The V390RA8 is an example of this evolution. It is a high performance, cost-effective TVS diode, built upon advanced silicon chip technology. In this article, we will explore the V390RA8\'s applications and working principle.

Application Field

The V390RA8 is an ultra-low capacitance TVS diode used primarily in safety protective circuits, with a working voltage rating of 16V to 39V. Its primary purpose is to protect delicate electronic equipment and wiring from electrical surges. It is specifically designed for surge-suppression applications requiring a guaranteed response time of less than 5 ns. This product offers advanced performance characteristics, including low voltage droop and higher peak pulse power handling ability. It is also fitted with a bidirectional protection scheme, allowing it to respond to both positive and negative transients.

The V390RA8 is suitable for a wide range of applications, including automotive EMC protection, industrial control systems, portable electronics, telecom equipment, servers and routers, and high-end consumer goods. It is a perfect solution for applications where a low capacitance is essential, and can be used in place of traditional PTCs or MOVs. It is also ideal for applications in higher temperature environments due to its superior thermal design. It can be easily integrated into circuit boards with its small 4.6 mm x 4.5 mm package.

Working Principle

The V390RA8 is built upon a silicon chip, featuring an anode and cathode electrode along with a thin layer of silicon dioxide between them. It has a unique configuration that allows it to perform two key functions. First, it provides the protection necessary for high-voltage, surge-related events. Second, it regulates the flow of current, limiting excess voltage and current from flowing through the cables and electronic components.

The V390RA8 works in much the same way as other MOVs or PTCs. When the current reaches a certain level, the V390RA8 starts to “crack down” on it, restricting the flow of electricity and preventing any spikes from occurring. It does so by way of a built-in voltage regulator which helps to regulate the flow of current. The voltage regulator ensures that the current is kept below a certain level, ultimately protecting the internal circuitry and the sensitive components connected to it.

Once activated, the V390RA8 immediately begins to respond. When a transient occurs, the transient voltage will start to raise, but the V390RA8 quickly clamps down on it, limiting its affected voltage range. This helps to prevent the sensitive components from sustaining any damage due to the overload of current or voltage. In the event of an over-voltage, the V390RA8 will immediately respond to keep the voltage and current within a safe range.

The V390RA8 is an advanced TVS diode designed to increase the level of protection for sensitive components in circuit boards. Its high-performance characteristics make it an ideal choice for a wide range of applications, and its bidirectional protection scheme allows it to provide protections for both positive and negative transients. With its low capacitance and superior thermal design, it is the perfect solution to provide reliable protection for electrical components.

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