ROV20E221K-S

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A varistor or voltage-dependent resistor (VDR) is an electronic component that is basically a nonlinear, three-terminal, voltage-controlled resistor. Varistors have two main applications, protection of electronic circuits from transient voltages, such as those induced by lightning, and compression of audio signals. Varistors are commonly known as TVS (transient voltage suppressors).

The ROV20E221K-S is a patented product from ROIC Corporation, a Taiwanese supplier of TVS Diode and Varistor components. This Varistor has a working voltage of 6.5V and a breakdown voltage of 21KV. Its composition includes two Mn/O elements with a ceramic-metal interface and an epoxy sealant. The ROV20E221K-S is designed to protect sensitive circuitry against transient over-voltage events, such as lightning, wiring faults and electrostatic discharge. The device provides a rated current of 50mA, a leakage current of 50nA, rise and fall times of 5 microseconds, and a response time of 2 microseconds.

When the ROV20E221K-S is exposed to an over-voltage condition, the varistor material provides an initially low resistance path to shunt the transient signal away from the protected electronics. When the signal passes, the varistor resistor returns to its normal lower resistance. This type of protection ensures that any transient events do not damage the circuit components.

ROV20E221K-S is especially suitable for high frequency protection in low frequency AC applications. This Varistor typically provides surge protection in alternating current lines, particularly low voltages. Also, it is an ideal component for transient voltages which could occur due to electrostatic discharge, power inductive loads, lightning and other surges. The ROV20E221K-S is used as a protection component to guard against high voltage and current spikes caused by lightning shortly after a lightning strike. The varistor can also be used in power networks to reduce transient overvoltage events.

The main advantage of this component is that it is highly sensitive to transient voltages, yet its design and low leakage characteristics allow it to provide outstanding protection at lightning speeds. At the same time, it does not discharge pre-strikes that could cause permanent damage. The relatively low capacitance and low ESR make the device a suitable choice for protecting sensitive components such as thyristors, power transistors, and ultra-low-voltage integrated circuits.

In summary, the ROV20E221K-S is a high-efficiency varistor designed to provide excellent overvoltage protection for sensitive electronics against transient events. Its fast response time, low-leakage current, and durable build make it an ideal choice for AC line protection and surge protection applications in many different industries.

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