| Image | Part Number | Description / PDF | Quantity | Rfq |
|---|---|---|---|---|
 |
Wickmann / Littelfuse |
VARISTOR 513.5V 1.2KA 2SMD |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 82V 6.5KA DISC 20MM |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 750V 10KA DISC 20MM |
85340800 |
|
 |
Abracon |
VARISTOR 19V 300A 1206 |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 27V 2KA DISC 20MM |
0 |
|
 |
J.W. Miller / Bourns |
ZV 17V 10% 0805 NI SN |
3450 |
|
 |
Wickmann / Littelfuse |
VARISTOR 18V 4KA DISC 14MM |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 390V 6.5KA RADIAL BOX |
0 |
|
 |
TDK EPCOS |
VARISTOR 470V 2.5KA DISC 10MM |
11269 |
|
 |
Elco (AVX) |
VARISTOR 34.5V 30A 0805 |
0 |
|
 |
RADIAL LEAD VARISTOR |
500 |
|
|
 |
Wickmann / Littelfuse |
VARISTOR 39V 250A DISC 7MM |
3225 |
|
 |
Wickmann / Littelfuse |
VARISTOR 240V 1.2KA DISC 7MM |
9225 |
|
 |
Elco (AVX) |
VARISTOR 8.5V 150A AXIAL |
3791 |
|
 |
Elco (AVX) |
VARISTOR 62V 250A 1210 |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 56V 500A DISC 10MM |
4098 |
|
 |
Wickmann / Littelfuse |
VARISTOR 34.5V 30A 0603 |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 205V 6.5KA DISC 20MM |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 205V 6.5KA DISC 14MM |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 34V 300A 1210 |
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: