Varistors

Varistors are in stock with same-day shipping at Mouser from industry leading manufacturers. Mouser is an authorized distributor for many varistor manufacturers including Bourns, KYOCERA AVX, Littelfuse, Panasonic, TDK & more.

Varistors are voltage-dependent resistive components designed to protect electronic circuits from transient overvoltage events caused by surges, lightning strikes, switching operations, and other electrical disturbances. Their resistance changes rapidly when exposed to excessive voltage, allowing them to divert harmful surge energy away from sensitive components and systems. These devices serve as an important layer of circuit protection, helping improve equipment reliability, safety, and operational longevity across a wide range of electronic applications.

Types: The most common varistor types include metal oxide varistors (MOVs), multilayer varistors (MLVs), surface-mount varistors, radial leaded varistors, high-energy varistors, automotive-grade varistors, and industrial surge protection varistors, each tailored for specific voltage, energy absorption, and protection requirements.

Applications: Varistors are widely used in power supplies, industrial automation systems, telecommunications equipment, consumer electronics, automotive electronics, renewable energy systems, home appliances, and power distribution equipment to protect sensitive circuits from voltage transients and surge events.

Selection requirements: To choose varistors, evaluate working voltage, clamping voltage, surge current capability, energy absorption rating, response characteristics, operating temperature range, package type, expected transient environment, and suitability for the intended electrical and environmental conditions.

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Please view our large selection of varistors below.