V27ZA20P Circuit Protection

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TVS - Varistors, MOVs, are typically two-terminal solid-state devices that are used for a variety of surge protection and EMI/RFI filtering applications. One of the most commonly used varistors is the V27ZA20P, which is widely used in high-voltage, high-current protection circuits and general EMI/RFI applications. This article will provide an overview of the V27ZA20P application field and its working principle.

V27ZA20P varistors are mainly used for surge protection in telecommunications, power supplies, instrumentation, lighting systems, automotive, and general industrial applications. In particular, it is widely used in telecom applications for protecting signal transmission lines from electrical surges. The V27ZA20P is also commonly used in high-voltage, high-current protection circuits. It can limit the transient voltage peak through its low reference impedance and lower clamping level.

The V27ZA20P is a nonlinear device that includes three different types of media: a polymeric dielectric, metal-oxide varistors, and metal electrodes. The dielectric is an encapsulating material that insulates the electrodes and the metal-oxide varistor material while providing dielectric protection. The metal-oxide varistors are composed of tiny granules of zinc oxide known as varistors or MOVs that act as a reverse-biased diode. When subjected to an electrical voltage, the zinc oxide granules form an electrical conduction path. Finally, the metal electrodes provide electrical contact to the metal-oxide varistor material.

The key electrical characteristic of the V27ZA20P is its ability to absorb high transient voltages without sustaining permanent damage. As a nonlinear device, the V27ZA20P will have a gradual, but very fast, onset of conduction. This start-up conduction voltage is variable and depends on the total stored charge. The V27ZA20P has a high leakage current above the conduction voltage point that goes back to zero when reset.

As the electrical voltage across the V27ZA20P increases, the zinc oxide granules of the MOVs will continue to absorb additional charge until the varistor reaches its peak voltage. As the voltage continues to rise above the varistor’s peak voltage, the current will begin to decrease, thus limiting the surge current. When the surge current decreases below the varistor’s peak current, the charges stored in the zinc oxide granules will begin to dissipate and the voltage across the V27ZA20P will decrease to its reference level.

In summary, the V27ZA20P is a two-terminal nonlinear device that is used for a variety of surge protection and EMI/RFI filtering applications. It includes three different types of media including a polymeric dielectric, MOVs, and metal electrodes. The main benefit is its fast start-up conduction voltage and its ability to absorb high transient voltages without sustaining permanent damage.

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