V625LU40AP

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TVS - Varistors, MOVs

Varistors, also known as "Metal Oxide Varistors", are a class of variable-resistance electronic components whose resistance is nonlinear, depending on the voltage applied across them. The metal oxide varistor (MOV) is the most commonly used varistor. The V625LU40AP is a series of metal oxide varistors produced by a variety of semiconductor manufacturers, and designed for use in a variety of applications including surge suppression, overvoltage protection, and line filtering.

V625LU40AP Applications

V625LU40AP metal oxide varistors are used in a variety of applications, such as power line disturbance suppression, overvoltage protection, and lightning protection. As surge suppression components, they are commonly used in power supplies, battery chargers, cell phone chargers, and other electronic circuits. They are also used in line filtering applications, such as EMI/RFI filtering in telecommunications systems, audio/video systems, and lighting systems.

V625LU40AP Working Principle

The working principle of a V625LU40AP varistor is based on its nonlinear voltage-current characteristics. When the applied voltage is below a certain threshold (known as the "breakdown voltage"), the varistor acts as an insulator, and does not allow current to flow. When the applied voltage exceeds the breakdown voltage, the resistance of the varistor decreases dramatically, allowing the current to flow unrestricted. The amount of current that flows in the varistor is determined by the applied voltage.

When the applied voltage is higher than the rated voltage of the varistor, the varistor will become saturated; that is, it will become a very low-resistance component, allowing the current to flow unrestricted. This type of current flow is known as "overload current", which is the current that the varistor is designed to absorb. The V625LU40AP is designed to absorb overload currents up to 20A in typical applications.

The V625LU40AP series of metal oxide varistors also feature an internal fail-safe feature called "thermal shutdown". This feature can be activated when the varistor absorbs overload current in excess of its rated current or when the temperature of the varistor exceeds a certain threshold. When this happens, the resistance of the varistor increases dramatically, effectively disconnecting it from the circuit it is protecting. This feature helps to protect the circuit by preventing further damage due to excessive current or elevated temperatures.

The V625LU40AP series of metal oxide varistors is an attractive choice for many applications, due to its low cost, high current capacity, and excellent surge protection capabilities. It is also easy to integrate into circuits and does not require an external power source. It is available in several different package sizes, making it suitable for use in a wide range of applications.

Conclusion

The V625LU40AP series of metal oxide varistors is a reliable, cost-effective solution for surge protection, line filtering, and overvoltage protection. It is capable of absorbing overload currents up to 20A in typical applications, and features an internal fail-safe feature for increased protection. It is available in several package sizes, making it suitable for use in a wide range of applications.

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