V460LA7PX2855

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Varistors, MOVs, and TVS diodes are widely used in electronic equipment for protection against overvoltage transients. These components perform functions similar to regular diodes, but with added protection features such as surge suppression. The V460LA7PX2855 is a popular varistor from the “LA” series range produced by Vishay Semiconductor and is one of the most robust and reliable overvoltage protection components available on the market. This article will discuss the application field and working principle of the V460LA7PX2855.

The V460LA7PX2855 is a surface mount varistor designed to protect electronic circuits and components from excessive overvoltage transients. It is a high power device rated for up to 460V AC (50/60Hz), with a rated current of 400A for a single pulse. It has a nominal clamping voltage of 7V and an operating temperature range of -40°C to +125°C. This device has a variety of mounting options, including standard axial, SMD (Surface-mount Device) and CauMot (Irregularly Shaped) packages.

The V460LA7PX2855 is suitable for use in a wide range of applications, including: power supplies, UPS systems, residential and commercial lighting, automotive electronics, telecommunications equipment, consumer electronics, and computer systems. It is also commonly used in industrial and medical applications where the need for reliable overvoltage protection is paramount. The device is also certified to the UL 1414 standard, CE marked, and conforms to the RoHS Directive.

As with all varistors, the V460LA7PX2855 is a voltage-dependent resistor which is typically used to protect circuits and components from dangerous overvoltage transients. The device operates as a semiconductor which presents a low resistance to current when the applied voltage is below a certain level, known as the “clamping voltage”. Once the applied voltage exceeds the clamping voltage of the device, the impedance of the device increases dramatically, effectively “clamping” the voltage and limiting the current flow through the device.

The working principle of the V460LA7PX2855 can be further understood by examining the voltage-current (V-I) curve of the device. When the applied voltage is below the clamping voltage, the device presents a low impedance or resistance to the current and thus the current increases almost linearly with increasing voltage. Once the clamping voltage is reached, the impedance of the device increases significantly and current flow is limited. This clamping action helps to protect the component downstream and limits excessive current flow.

In addition to providing overvoltage protection the V460LA7PX2855 offers unmatched ESD protection of up to 25kV. It also has an exceptionally low leakage current and a fast response time of 15ns, making it ideal for applications requiring fast protection. The device is also self-healing, which ensures that it will not be damaged by transient events and will be able to continue protecting electronic systems and components.

The V460LA7PX2855 is a robust and reliable surface mount varistor offering excellent protection against overvoltage and ESD events. It is suitable for use in an array of applications, from power supplies and UPS systems to automotive and medical electronics. The device has a fast response time, low leakage current, and is self-healing, making it an ideal protection component for sensitive electronic equipment.

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