Voltage Dependent Resistor

Voltage Dependent Resistor Overview

Voltage Dependent Resistors (VDRs), also known as varistors, are a fundamental component in managing voltage levels in electrical circuits. With a selection exceeding 1300 products, these components are designed to protect against excessive transient voltages by significantly changing their resistance in response to voltage spikes.

Types and Configurations

VDRs come in various types, including metal oxide varistors (MOVs), silicon carbide varistors, and multilayer varistors (MLVs). Each type serves a specific application and environment, with MOVs being the most prevalent due to their energy absorption capabilities and durability against repeated voltage spikes.

Applications and Uses

The application of voltage dependent resistors spans across numerous industries. They are integral in power supply units to safeguard against surges, within automotive electronics to stabilize voltage fluctuations, and in consumer electronics to extend the lifespan of devices by preventing damage from power surges.

Features and Materials

VDRs are characterized by their non-linear, voltage-clamping behavior and are typically constructed from ceramic material imbued with metallic oxides. This composition allows for a rapid response to voltage changes, making them an essential component in surge protection circuits.

Advantages of VDRs

The advantages of using voltage dependent resistors include their ability to handle high transient voltages and dissipate significant amounts of energy, which contributes to the overall safety and longevity of electronic systems. Their compact size also allows for easy integration into a variety of circuit designs.

Selection Considerations

When selecting a voltage dependent resistor, it is crucial to consider factors such as the maximum clamping voltage, energy absorption rating, and response time. These parameters ensure that the chosen VDR aligns with the specific protection requirements of the application in question.