ROV07H820K-S-2

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The ROV07H820K-S-2 Varistor device is a type of Surge Suppressive Product from the TVS- Varistors- MOVs family. Developed to protect sensitive electronic components from electrical overstress and overvoltage, the varistor provides a reliable protection against transient voltage pulses from power line disturbances. In this article, we discuss the application field and working principle of the ROV07H820K-S-2 Varistor.

Devices like the ROV07H820K-S-2 are used in various electronic systems, from consumer electronics, to high power industrial systems. Thanks to their robust design, varistors can be integrated into almost any system-level protected electronic device. They protect the end device from spurious transients induced by external signals, switching power supply or motor activities. Varistors provide instantaneous voltage clamping during a surge and a residual voltage lower than the peak clamping voltage as soon as the surge is over. This ensures the safe operation of any device.

The ROV07H820K-S-2 Varistor is a non-linear voltage dependent device, characterized by a specific peak clamping voltage. It is an AC component which means it is suitable for use in AC applications, though it is also suitable for DC applications provided the device is adequately mounted with appropriate heatsinking. The ROV07H820K-S-2 Varistor is characterized with overvoltage protection of 800V Peak Clamping Voltage with a VBR of 8.2V +/- 5%. It provides a SMD package which offers flexibility in terms of assembly, while also providing a secure mounting solution. The device also offers high current handling capabilities, with instantaneous surge current of 8.2kA that can be carried for 10/1000μsec pulse duration.

The ROV07H820K-S-2 Varistor is based on a silicon based varistor element. When connected to a circuit, the varistor element will allow current to flow only when an external voltage overcomes its clamping voltage value. This means that initially the current in the circuit is zero, and during huge transients the current will ramp up to its peak clamping value, absorbing the energy generated by the transient. The worked example is as follows. When the external transient voltage surge is 8.2V, the current in the circuit will instantly ramp up to its peak, and when the transient comes to an end, the current will gradually decay to zero, allowing the varistor element to return to an open state. This open-state is characterised by a specific leakage current which needs to be considered when designing the printed circuit board. It is recommended that the external circuit should be designed to limit this current to the lowest possible.

The ROV07H820K-S-2 Varistor device is mainly used for overvoltage and transient voltage protection for low and low-medium power systems, such as within home appliances, consumer electronic equipment, office machines, and more. Thanks to its excellent response time, low leakage current, and robust design, the Varistor is an ideal overvoltage protection choice for such electronic systems.

In conclusion, the ROV07H820K-S-2 Varistor is a valuable addition to the TVS-Varistors-MOVs family of devices. With its excellent performance and dependable overvoltage protection, it is an effective, reliable solution for a variety of low and low-medium power systems. It provides instantaneous response to surges and transients, and also a low leakage current. It is a component which offers maximum flexibility in terms of assembly, and provides a secure mounting solution to ensure system performance.

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