| Image | Part Number | Description / PDF | Quantity | Rfq |
|---|---|---|---|---|
 |
Meritek |
VARISTOR 180V 800A DISC 5MM HIGH |
0 |
|
 |
TDK EPCOS |
VARISTOR 510V 25KA ENCASED DISC |
1519 |
|
 |
Wickmann / Littelfuse |
VARISTOR 68V 2KA DISC 20MM |
0 |
|
 |
TDK EPCOS |
VARISTOR 390V 100KA ENCASED DISC |
8 |
|
 |
PowerStor (Eaton) |
VARISTOR SMD 2825 275V |
0 |
|
 |
Yageo |
MOV |
0 |
|
 |
TDK EPCOS |
VARISTOR 390V 2.5KA DISC 10MM |
3450 |
|
 |
Panasonic |
VARISTOR 27V 125A 2SMD JLEAD |
1803 |
|
 |
Wickmann / Littelfuse |
VARISTOR 470V 1.75KA DISC 7MM |
0 |
|
 |
Abracon |
VARISTOR 12V 10A 0402 |
0 |
|
 |
TDK EPCOS |
VARISTOR 560V 10KA RADIAL BOX |
0 |
|
 |
KEMET |
VARISTOR 68V 120A 1206 |
0 |
|
 |
TDK EPCOS |
VARISTOR 22V 250A 2SMD JLEAD |
3000 |
|
 |
Meritek |
VARISTOR 680V 6500A 20MM DISC TH |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 18V 2KA DISC 10MM |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 40KA SQUARE 34MM TABS |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 47V 4KA DISC 14MM |
0 |
|
 |
Panasonic |
VARISTOR 22V 250A DISC 5MM |
1882 |
|
 |
Vishay BC Components/Beyshlag/Draloric |
VDR US 20D 130AA 300V STLDS BULK |
277 |
|
 |
PowerStor (Eaton) |
VARISTOR SMD 2825 180V |
0 |
|
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.
| Type | Functional Characteristics | Application Examples |
|---|---|---|
| TVS Diodes | Unidirectional/bidirectional clamping, sub-nanosecond response time, low leakage current | Communication interfaces (USB, HDMI), microcontrollers, power supplies |
| Zinc Oxide Varistors | High energy absorption, voltage-dependent resistance, aging characteristics | Power line protection, industrial motor drives, surge protection strips |
| MOVs | Specialized varistors with metal oxide ceramics, optimized for AC/DC applications | Appliances, LED lighting, renewable energy systems |
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.
| Parameter | Description | Importance |
|---|---|---|
| Clamping Voltage (VCLAMP) | Voltage level during surge conduction | Determines protection level for downstream components |
| Response Time | Time to transition from blocking to clamping mode | TVS: 0.5-10 ns; MOVs: 10-50 ns |
| Energy Absorption (WADM) | Maximum surge energy handling capability | Measured in joules (J), critical for industrial applications |
| Leakage Current | Off-state current at rated voltage | Impacts power efficiency, typically <100 A |
Key industries include:
Case Study: MOVs in smart meters provide 10kA surge protection against grid transients.
| Manufacturer | Representative Product | Key Specifications |
|---|---|---|
| Littelfuse | SM712-02 | 12A, 13.3V clamping, bidirectional TVS for RS-485 |
| Bourns | V14450A | 14mm MOV, 450VAC, 210J energy rating |
| STMicroelectronics | TV05C060 | 0.5W, 6V, ultra-small TVS for IoT devices |
Key considerations:
Emerging trends include: