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TVS - Varistors, MOVs

Image Part Number Description / PDF Quantity Rfq
VDRUS14X140BKE

VDRUS14X140BKE

Vishay BC Components/Beyshlag/Draloric

VDR US 14D 8000A 140V KNLDS

0
VDRUS10T625BKE

VDRUS10T625BKE

Vishay BC Components/Beyshlag/Draloric

VDR US 10D 4500A 625V KNLDS

0
VDRUS10T550BKE

VDRUS10T550BKE

Vishay BC Components/Beyshlag/Draloric

VDR US 10D 4500A 550V KNLDS

0
VDRUS10T385BKE

VDRUS10T385BKE

Vishay BC Components/Beyshlag/Draloric

VDR US 10D 4500A 385V KNLDS

0
VDRUS07M175BKE

VDRUS07M175BKE

Vishay BC Components/Beyshlag/Draloric

VDR US 07D 1800A 175V KNLDS

0
VDRUS14X420BSE

VDRUS14X420BSE

Vishay BC Components/Beyshlag/Draloric

VDR US 14D 8000A 420V STLDS

0
VDRS10P275BSE

VDRS10P275BSE

Vishay BC Components/Beyshlag/Draloric

VARISTOR 430V 2.5KA DISC 12MM

820
VDRH07K275BSE

VDRH07K275BSE

Vishay BC Components/Beyshlag/Draloric

VARISTOR 430V 1.75KA DISC 9MM

3365
VDRS10P150BSE

VDRS10P150BSE

Vishay BC Components/Beyshlag/Draloric

VARISTOR 240V 2.5KA DISC 12MM

0
VDRS07H420BSE

VDRS07H420BSE

Vishay BC Components/Beyshlag/Draloric

VARISTOR 680V 1.2KA DISC 9MM

0
VDRS07H060BFE

VDRS07H060BFE

Vishay BC Components/Beyshlag/Draloric

VARISTOR 100V 1.2KA DISC 9MM

0
MLV1206E33503T

MLV1206E33503T

Vishay BC Components/Beyshlag/Draloric

VARISTOR 180A 1206

0
VDRH14V275ALE

VDRH14V275ALE

Vishay BC Components/Beyshlag/Draloric

VARISTOR 430V 6KA DISC 16MM

0
VDRH07K250TSE

VDRH07K250TSE

Vishay BC Components/Beyshlag/Draloric

VARISTOR 390V 1.75KA DISC 9MM

0
VDRS07H175TSE

VDRS07H175TSE

Vishay BC Components/Beyshlag/Draloric

VARISTOR 275V 1.2KA DISC 9MM

0
VDRS05C060TLE

VDRS05C060TLE

Vishay BC Components/Beyshlag/Draloric

VARISTOR 100V 400A DISC 7MM

0
VDRS05A030TME

VDRS05A030TME

Vishay BC Components/Beyshlag/Draloric

VARISTOR 47V 100A DISC 7MM

0
VDRS05C300TSE

VDRS05C300TSE

Vishay BC Components/Beyshlag/Draloric

VARISTOR 470V 400A DISC 7MM

0
VDRH14V150BSE

VDRH14V150BSE

Vishay BC Components/Beyshlag/Draloric

VARISTOR 240V 6KA DISC 16MM

0
VDRS20M040BSE

VDRS20M040BSE

Vishay BC Components/Beyshlag/Draloric

VARISTOR 68V 2KA DISC 22.50MM

0

TVS - Varistors, MOVs

1. Overview

Transient Voltage Suppressors (TVS), Varistors, and Metal Oxide Varistors (MOVs) are critical components for protecting electronic circuits from voltage spikes and electrostatic discharge (ESD). These devices clamp excessive voltage to safe levels, preventing damage to sensitive components. TVS diodes are semiconductor-based solutions with fast response times, while Varistors (including MOVs) use nonlinear resistive materials to absorb energy. Their importance spans industries like telecommunications, automotive, and consumer electronics, ensuring reliability in environments exposed to electrical surges.

2. Main Types and Functional Classification

TypeFunctional CharacteristicsApplication Examples
TVS DiodesUnidirectional/bidirectional clamping, sub-nanosecond response time, low leakage currentCommunication interfaces (USB, HDMI), microcontrollers, power supplies
Zinc Oxide VaristorsHigh energy absorption, voltage-dependent resistance, aging characteristicsPower line protection, industrial motor drives, surge protection strips
MOVsSpecialized varistors with metal oxide ceramics, optimized for AC/DC applicationsAppliances, LED lighting, renewable energy systems

3. Structure and Composition

TVS diodes employ a PN junction semiconductor structure with doping profiles optimized for breakdown characteristics. Varistors consist of polycrystalline ceramic materials (typically zinc oxide grains with additives) sandwiched between metal electrodes, encapsulated in epoxy or molded housings. MOVs use similar materials to varistors but with enhanced grain boundary engineering for improved voltage clamping. All devices incorporate termination coatings (e.g., silver, tin) for PCB mounting compatibility.

4. Key Technical Parameters

ParameterDescriptionImportance
Clamping Voltage (VCLAMP)Voltage level during surge conductionDetermines protection level for downstream components
Response TimeTime to transition from blocking to clamping modeTVS: 0.5-10 ns; MOVs: 10-50 ns
Energy Absorption (WADM)Maximum surge energy handling capabilityMeasured in joules (J), critical for industrial applications
Leakage CurrentOff-state current at rated voltageImpacts power efficiency, typically <100 A

5. Application Fields

Key industries include:

  • Consumer Electronics: Smartphone charging circuits, TV power supplies
  • Industrial Automation: PLCs, motor drives, sensor interfaces
  • Automotive: ECU protection, CAN bus interfaces, battery management systems
  • Renewable Energy: Solar inverters, wind turbine controllers

Case Study: MOVs in smart meters provide 10kA surge protection against grid transients.

6. Leading Manufacturers and Products

ManufacturerRepresentative ProductKey Specifications
LittelfuseSM712-0212A, 13.3V clamping, bidirectional TVS for RS-485
BournsV14450A14mm MOV, 450VAC, 210J energy rating
STMicroelectronicsTV05C0600.5W, 6V, ultra-small TVS for IoT devices

7. Selection Guidelines

Key considerations:

  • Operating voltage vs. clamping voltage margin
  • Surge current requirements (8/20 s waveform standard)
  • Package size constraints (SMD vs. through-hole)
  • Environmental conditions (temperature, humidity)
  • Lifespan expectations (MOVs degrade with repeated surges)

8. Industry Trends

Emerging trends include:

  • Miniaturization: Sub-0201 TVS devices for mobile applications
  • Higher energy density: MOVs with >1000J/cm absorption
  • Integration: Combined ESD and surge protection solutions
  • Automotive focus: AEC-Q qualified devices for 48V systems
  • Green manufacturing: Lead-free and RoHS-compliant materials
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