ROV07-221K-S-2

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TVS – Varistors, MOVs, are protection devices that are designed to protect against transient voltage peaks due to events such as lightning, electrostatic discharge (ESD) and electromagnetic interference (EMI). They are used to protect sensitive electronic equipment from damage due to overvoltage spikes. The ROV07-221K-S-2 is one such device.

The ROV07-221K-S-2 is a two-electrode, bidirectional protection device that utilizes an exothermic deposition process to form silicon carbide layers on a metal oxide substrate. The substrate is a metal oxide which consists of zinc oxide (ZnO) and a conductive metal oxide with lower resistance than that of the pure ZnO substrate. This combination gives the device superior performance over conventional Metal Oxide Varistors (MOV\'s).

The device provides protection from both overvoltage and undervoltage conditions and can withstand high surge currents of up to 6000A. It also has an operating temperature range of -55°C to + 165°C. The maximum clamping voltage of the device is 160V and its minimum dissipation is 0.20 Watts.

It has a wide application range and can be used in mobile products, IT equipment, industrial equipment, automotive applications such as electric vehicles and instrumentation, medical, consumer electronic products, and telecommunication systems.

In terms of working principle, the device is composed of a thin layer of conductive metal oxide, which acts as a surge protective element. The device works in the following manner; when a transient overvoltage surge enters the protected circuit, the device senses the surge and activates a \'crowbar\' circuit which shunts the secondary lead of the device across the primary lead, thus dissipating the transient energy. Since the device has low impedance at low frequencies, it can effectively clamp transient voltages which occur during short duration overload transients.

The device also has a positive temperature coefficient (PTC) which provides an additional layer of protection against further surge events. The PTC limits the peak voltage by increasing the series resistance as the temperature of the component rises beyond a predetermined limit. This helps to ensure that the device does not fail catastrophically as a result of successive surges beyond its voltage clamping ability.

The ROV07-221K-S-2 is a highly reliable and cost-effective device that is used to provide excellent protection against transient overvoltage events. It is suitable for a wide variety of applications, including automotive, industrial, medical and telecommunications systems. Thanks to its superior performance and robust design, it is one of the most popular surge protection devices in the market.

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