ROV14H511K-2

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Transient voltage suppression (TVS) devices protect sensitive electronic equipment from voltage spikes, which can originate either external sources or from the equipment itself. There are three main types of TVS devices that protect circuits from overvoltage: varistors, metal oxide varistors (MOVs) and silicon avalanche diodes (SADs). The ROV14H511K-2 is an example of a varistor device. This article will explain the application field of the ROV14H511K-2 and the working principle of varistors.

The ROV14H511K-2 is a volt-ohm varistor designed for use in high temperature environments. It is intended for overvoltage protection of automotive circuits and general-purpose circuits and controls. It is able to operate at temperatures up to 125°C and can withstand repetitive thermal shocks from -55°C to 125°C. It features a wide operating voltage range, from as low as 65V to as high as 150V, and a low capacitance of 4 pF. Its maximum leakage current is 3.5 mA at 100V, and its maximum surge current is 133 A. These specifications make it ideal for automotive circuits, and it is also well suited for overvoltage protection of general-purpose circuits and controls.

Varistors are nonlinear, bidirectional devices, often referred to as voltage dependent resistors (VDRs). When a voltage is applied to a varistor, it will exhibit a resistance that is proportional to the applied voltage. As the voltage increases, the resistance of the varistor will decrease, allowing more current to flow. This behavior is the basis of a varistor\'s overvoltage protection. When a voltage spike occurs, the varistor will allow more current to flow, acting as a short circuit and dissipating the surge energy, thus protecting the circuit from overvoltage damage.

In addition to their overvoltage protection capabilities, varistors also provide low-pass filtering of signals. This is due to the fact that higher frequencies have shorter rise and fall times, allowing them to be shunted away by the varistor\'s relatively low impedance. This makes them well suited for audio-frequency and digital signal applications.

Varistors also have much lower series resistance than other TVS devices, such as MOVs and SADs. This makes them ideal for applications that require low-loss signal transmission. This low series resistance also enables varistors to dissipate more surge energy than other TVS devices.

The ROV14H511K-2 is an example of a varistor device designed for use in high temperature environments. Its wide operating voltage range, relatively low capacitance and low series resistance make it ideal for overvoltage protection of automotive circuits and general-purpose circuits and controls. Its low-pass filtering properties also make it suitable for audio-frequency and digital signal applications.

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