ROV07H621K-2

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The ROV07H621K-2 is a bi-directional varistor designed to protect electronic circuit in the event of transient over-voltage. Varistors, also known as voltage dependent resistors or VDRs, are a type of transistors that protects circuits against current surges, spikes, and EMI/EMC.

Varistors are nonlinear, two-terminal, static passive components with a near-unity linear impedance for operating voltages and a high impedance for off-state voltage. At the normal operation voltage they behave like resistors, thus reducing the current to a safe limit and protecting the circuit against transient over-voltages.

The ROV07H621K-2 belongs to the TVS (Transient Voltage Suppression) category of varistors. TVSs are specifically designed to protect electric and electronic components from voltage transients, such as electrostatic discharge (ESD), inductive switching, and lightning surge.

The ROV07H621K-2 features a capacitor-varistor construction, meaning that the varistor element is integrated into a standard axial-leaded capacitors. This integrated varistor provides superior protection for all types of microprocessor controlled devices and reduces the total component size.

The ROV07H621K-2 has an operating voltage range of 120 VAC and a clamping voltage (VC) of 216VAC. It can withstand a maximum surge current of 25 A. The varistor has a capacitance range of 107-157pF and a voltage coefficient of 0.006. The device has a transient protection speed of 42 V/ns and a positive temperature coefficient that allows the varistor to withstand higher voltages for longer times.

The ROV07H621K-2 is mainly used in applications such as electronic control circuits, automotive electronics and home electronics. It can also be used in telecommunications applications, such as RF/microwave systems, cellular phones, portable communications devices, and wireless devices. The varistor is also suitable for high power supply and EMI/RFI applications.

In terms of working principle, the ROV07H621K-2 works by increasing the impedance of the circuit in the event of an overvoltage. When the overvoltage is below the varistor\'s rated voltage, the device acts like a capacitor with a near-unity (or very low) impedance. When the voltage rises above the varistor\'s rated voltage, its impedance increases substantially and it will dissipate the energy from the current surge, thus protecting the circuit from damage.

In conclusion, the ROV07H621K-2 is a bi-directional varistor designed to protect electronic circuits from transient over-voltages. It belongs to the TVS (Transient Voltage Suppression) family of varistors, and features a capacitor-varistor construction. The device has an operating voltage range of 120 VAC and a clamping voltage of 216VAC. Its usage includes applications such as electronic control circuits, automotive electronics, home electronics, telecommunications, and high power supply. The varistor dissipates the effect of voltage surge by increasing its impedance once the voltage rises beyond the varistor\'s rated voltage.

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