ROV10H471K-2

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The ROV10H471K-2 is a varistor, or voltage dependent resistor, designed to protect items such as electrical equipment from overvoltages and transient events. It is a common component in power supplies and other electric control systems.

Varistors operate by reducing the voltage of a circuit when a surge or spike occurs. The basic principle of operation is based on the fact that the resistance of a varistor is dependent on the applied voltage, and therefore when a sudden increase in voltage occurs, the resistance of the varistor will change to provide a current path to the ground. This will ultimately lead to a reduced voltage within the circuit.

The ROV10H471K-2 is an SMD (surface mount device), with a disc form factor. It is suitable for applications requiring high surge current protection, such as switching power supplies, power line protection circuits, and IGBT/MOSFET overvoltage protection circuits. The operating temperature range for this component is between -55°C and +125°C.

The varistor has a relatively low insertion loss to ground (VLG) of about 0,8V, and will regulate an input voltage of up to 250V peak. It has a rated unclamped energy rating of 5.7joules, and a maximum capacitance of 500pF. Other properties of this component include a current carrying capacity of up to 75A peak, and a typical response time of 8ns.

The ROV10H471K-2 utilizes a semi-guarded Zinc Oxide (ZnO) element to provide suppression of transient surge events. This element provides protection from both high- and low-energy events, and is resistant to low-impedance faults, ensuring that the protected items are not damaged by an internal short circuit. This also provides some protection against contact discharges, which can cause the component to degrade faster.

The ZnO element provides a low clamping voltage, which helps to ensure that the protected equipment is not damaged by the transient events, allowing the equipment to continue to operate normally. When a surge occurs, the element also limits the peak current (if applicable) that can pass through the component.

The ROV10H471K-2 has an operating voltage range between 4V and 18V, making it suitable for use in low-voltage applications. It also has a particularly low leakage current of approximately 0.02 µA, which helps to minimize the power consumption of the protected equipment.

In addition to being a surge protection device, the ROV10H471K-2 can also be used as an overvoltage protection device, by providing an instantaneous clamping of the overvoltage and limiting the power dissipation. This helps to prevent the protected items from being damaged due to an overvoltage event.

Overall, the ROV10H471K-2 is a high-performance, reliable and cost-effective voltage dependent resistor, designed for the protection of electrical and electronic equipment against overvoltages and transient events. Its low leakage current, high surge protection rating and wide operating temperature range makes it suitable for use in a variety of applications.

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