2859466

TVS - Varistors, MOVs

TVS, or transient voltage suppressor, is an electronic device with many different applications. It is an essential component for electrical systems, as it can protect components from damage by absorbing surges in the power supply. Additionally, TVS can be used to regulate voltage or reduce incoming noise from outside sources. TVS can be categorized as either a Varistor or an MOV (Metal Oxide Varistor).

Varistors

A varistor, or VDR (Voltage Dependent Resistor), is a two-terminal, nonlinear, voltage-dependence device. It is composed of a semiconductor dielectric material that reacts to voltage and doesn’t conduct until the voltage becomes higher than a certain threshold and then begins to conduct. Varistors are frequently used to protect electronic components from large voltage spikes.

MOVs (Metal Oxide Varistors)

An MOV (Metal Oxide Varistor) is a type of varistor composed of a sintered mass of an oxide material, pressed into a pellet and wire bonded to two leads. MOVs are used to protect electronic components from high-energy transients, such as lightning strikes, generated from either outside sources or internally generated within the electronic system. MOVs are commonly used in lightning protection systems, surge protectors, and transient voltage suppressors.

2859466 Application Field and Working Principle

2859466 is a type of TVS (Transient Voltage Suppressor) circuit commonly used in applications requiring overvoltage or overshoot protection. The principle of operation is based on the insertion of a reverse biased diode into the circuit which allows a maximum reverse voltage to be passed through. When this maximum is exceeded, the voltage across the diode increases, causing the voltage drop across it to become greater than the power supply voltage. This causes current to flow through the diode, dissipating the energy of the overshoot.

The application field of 2859466 includes over-voltage protection, such as lightning protection for equipment, automotive electronic equipment, and other electrical systems including an AC line, DC lines, and communication lines. It is also used in applications where fast response time and low capacitance are essential.

This type of TVS circuit has a low capacitance of about 2 pF, making it suitable for high-speed systems as it can dissipate energy fast and accurately. It also enables the circuit to withstand repetitive voltage surges with little to no degradation. This makes it ideal for applications that need to be reliable and resistant to failure. Consequently, it is the preferred solution for most applications requiring overvoltage or overshoot protection.

Conclusion

TVS circuits, such as the 2859466, are becoming increasingly important for protecting electronic devices, as they are reliable and offer fast response times for overvoltage protection. Varistors and MOVs are the two main types of TVS circuits, of which the 2859466 belongs to the latter. MOVs typically have low capacitance and can handle repetitive surges with minimal degradation, making it ideal for applications requiring protection from high-energy transients.