Ring-shaped varistor

Main Features:

This series of ring‑shaped varistors is a high‑performance overvoltage and noise‑suppression component specially optimized for miniature DC motors. Made from strontium titanate/zinc oxide semiconductor ceramic, they exhibit excellent nonlinear I‑V characteristics and low‑frequency capacitance. The devices can be directly mounted onto the motor commutator; when commutation generates voltage spikes and electromagnetic interference, they rapidly absorb transient overvoltages, suppress high‑frequency noise, and protect the contacts from arc erosion, thereby extending motor life. Their annular design fits snugly around the motor shaft without requiring additional space, making them an ideal solution for surge protection and noise reduction in small motors, solenoids, and relays.

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Category:

Varistors

Keyword: Ring-shaped varistor

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Key Features

Piezoresistive and Capacitive Composite Functionality It simultaneously provides transient overvoltage suppression and high-frequency noise reduction, effectively mitigating both motor commutation sparks and EMI interference to deliver efficient filtering and protection.
Broadband noise suppression capability : Featuring high capacitance, it delivers excellent noise‑absorption performance across an extremely wide frequency range, effectively reducing electromagnetic interference during motor operation.
Excellent surge absorption performance : It features a high nonlinear coefficient, enabling rapid dissipation of surge currents and protecting contacts from arc erosion, thereby extending the service life of motor contacts.
Excellent temperature stability The voltage‑temperature characteristics of the varistor are stable, and its noise level does not increase significantly in low‑temperature environments, thereby having no adverse impact on the motor’s low‑temperature start-up performance or service life.
Ring-shaped integrated design It can be directly fitted onto the motor shaft commutator, offering convenient installation without requiring additional PCB space, and is compatible with various miniature motor designs.
High reliability and long lifespan : Employing a ceramic sintering process, the structure is robust, impact‑resistant, and resistant to aging, ensuring the stability required for the motor’s long‑term continuous operation.
Environmental Compliance Support : Compliant with RoHS and REACH environmental standards, manufactured using lead-free processes, and certified to safety regulations, meeting global market compliance requirements.

Typical application scenarios

Automotive electronics field Noise suppression and contact protection for window lift motors, wiper motors, seat adjustment motors, and door lock motors.
Home appliance sector : Noise reduction and protection for micro DC motors used in small household appliances such as electric toothbrushes, hair dryers, vacuum cleaners, and coffee makers.
Industrial control field : Contact protection and EMI suppression for servo motors, stepper motors, solenoid valves, and relays.
Consumer electronics sector : Overvoltage protection and noise control for fan motors, camera lens drive motors, and power tool motors.
Other applications : Surge suppression and electromagnetic compatibility optimization for various types of small DC motors, micro‑motors, and commutator devices.

Technical Specifications

Structural configuration: annular through-hole type, compatible with motor shaft mounting.
Core material: Strontium titanate / Zinc oxide semiconductor ceramic
Clamping Voltage (E₁₀mA): Typical range 1.5–60 V (customizable upon request)
Nonlinear coefficient (α): 2.5–6.0, with excellent surge absorption capability.
Capacitance (1 kHz): Typical 1–120 nF, with excellent high-frequency noise suppression.
Temperature coefficient: |K| ≤ 0.3%/°C, with stable voltage characteristics.
Response time: <25 ns, rapidly absorbs transient surge spikes.
Operating temperature range: -40°C to +105°C, suitable for a wide-temperature‑range operating environment.
Package type: ceramic body with tin-plated leads, compatible with motor mounting.
Environmental Compliance: RoHS and REACH compliant, lead-free process

Customized Services

We offer end-to-end customized services, enabling us to tailor the following solutions based on the customer’s motor model, mounting dimensions, voltage rating, and noise‑reduction requirements:

Customizable inner diameter, outer diameter, and wall thickness to accommodate various motor shaft diameters and installation spaces.
Targeted optimization of electrical parameters such as clamping voltage, capacitance, and nonlinearity coefficient to meet the protection and noise‑reduction requirements of specific application scenarios.
Customizable pin configurations, lengths, and pitch options, enabling customers to solder or mount components directly.
We offer mass production and rapid delivery services, along with comprehensive technical support, product selection solutions, and test reports, helping customers efficiently complete motor protection and noise‑reduction designs.

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