V470ZU05P

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TVS (Transient Voltage Suppressors) have been available for over 40 years and remain an effective means of overvoltage protection for a wide range of electronic devices. Varistors, MOVs (Metal Oxide Varistors) and other surge protectors are also widely used. The V470ZU05P is an example of a varistor suitable for a range of applications. This article will explain its working principle and the types of application in which it can be used.

Introduction

The V470ZU05P is a 5mm diameter circular disc varistor manufactured by Vishay. Varistors are non-linear voltage dependent devices used for a wide range of applications, including over-voltage protection, transient voltage control, and filtering. This particular varistor has a rated voltage of 470VAC and a peak current rating of 109A (Impulse).

How it Works

Varistors work by limiting the voltage seen by connected components to a safe level. They achieve this by using a non-linear current-voltage characteristic which creates a clamping action. This clamping action is triggered when a certain threshold is exceeded, and the varistor then begins to conduct current in an attempt to reduce the voltage. It does this by diverting excess current away from devices connected to the circuit and thereby protecting them from over-voltage damage.

To create this non-linear characteristic, varistors are made up of sintered layers of ceramic material with different levels of electrical conductivity. This material varies depending on the type of varistor, but typically consists of zinc oxide or metal oxide particles such as cadmium, cobalt, nickel or silver. In the case of the V470ZU05P, its ceramic layers contain a combination of zinc oxide, cobalt and silver.

When under normal operating conditions, the V470ZU05p remains in a non-conductive state; this is referred to as its ‘High Impedance’ state. However, if an overvoltage condition is encountered, the varistor quickly transitions to its ‘Low Impedance’ state and begins to conduct current. This process protects connected devices by diverting the increased current away from them.

Application Fields

Varistors are used in a range of applications, especially where transient over-voltage protection is required. Common applications include computer and consumer electronics, industrial control equipment, automotive devices and many others. The V470ZU05P is particularly suitable for applications with high pulse currents due to its peak current rating of 109A. Examples of applications that can benefit from this include servo control systems and medical equipment.

Additionally, the V470ZU05P is also ideal for more general over-voltage protection applications such as those found in power supplies, TV sets and other household appliances. The combination of its medium surge current and low clamping voltage make it well-suited to these applications.

Conclusion

The V470ZU05P is a 5mm disc varistor suitable for a range of applications. It is primarily designed to provide over-voltage protection for electronic devices by clamping the voltage seen by connected components to a safe level. It is particularly well-suited to applications with high pulse currents due to its peak current rating of 109A and can also be used in more general over-voltage protection applications.

Overall, the V470ZU05P is a great example of a versatile varistor that can be used in a variety of applications. It is efficient, reliable and cost-effective, making it an excellent choice for over-voltage protection in both commercial and domestic settings.

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