ROV20H391K-S

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Varistors, also known as voltage-dependent resistors (VDRs), are non-linear electrical devices which have the ability to limit excessive voltage and current in electronic circuits. This means that they can protect devices from over-voltage and over-current damages that are caused by electrical surges or spikes. The most common type of varistor is the metal oxide varistor (MOV) and it is typically used in various industries such as aerospace, automotive, medical, and telecommunications. The ROV20H391K-S is a low temporary overvoltage surge stopper (TVS) that belongs to the family of MOVs.The ROV20H391K-S is a surface-mount, unidirectional device that is commonly used for protecting electronic circuits from over-voltage transients and electrostatic discharge (ESD) events. The device is composed of zinc oxide varistor elements that are encapsulated in a UL94-V0 flame-retardant ceramic case. The ROV20H391K-S is offered with various options in terms of voltage, current, and power ratings, depending on the application.The typical application areas of the ROV20H391K-S can include computers, cell phones, automation systems, consumer electronics, and many other industrial applications. It is widely used for protecting data lines, power lines, and communication lines from over-voltage transients. Additionally, it can also be used as an effective ESD protection on high-sensitivity and high-frequency circuits.The working principle of the ROV20H391K-S is based on the property of the metal oxide varistor element to rapidly change its conductivity with the change of voltage. It works by providing a non-linear conduction when voltage applied to it increases beyond its breakdown voltage. This results in an increased in-rush current and rapid voltage clamping, thus providing protection against over-voltage transients.When the voltage applied to the ROV20H391K-S reaches or exceeds its breakdown voltage, the instantaneous current increases and the voltage is clamped by the device. This process occurs very fast and the resulting in-rush current is much higher than the nominal current rating of the device. Once the peak current has been dissipated the device resumes to its non-conducting state.The ROV20H391K-S provides an effective form of protection against over-voltage transients and ESD events. It is a low-cost, small-sized, environment-friendly solution that is suitable for a variety of applications. Additionally, its fast response time makes it suitable for use in high-speed circuits. This makes the ROV20H391K-S an ideal choice for protecting sensitive equipment from over-voltage transients and ESD events.

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