| Image | Part Number | Description / PDF | Quantity | Rfq |
|---|---|---|---|---|
 |
Elco (AVX) |
VARISTOR 12.7V 30A 0612 |
1701 |
|
 |
Elco (AVX) |
VARISTOR 34.5V 300A 1210 |
581 |
|
 |
Elco (AVX) |
VARISTOR 12.7V 40A 0805 |
169 |
|
 |
Elco (AVX) |
VARISTOR 0805 |
0 |
|
 |
Elco (AVX) |
VARISTOR 41V 280A 1210 |
411 |
|
 |
Elco (AVX) |
VARISTOR 150V 250A 1812 |
20001000 |
|
 |
Elco (AVX) |
VARISTOR 24.5V 1.5KA 2220 |
0 |
|
 |
Elco (AVX) |
VARISTOR 76V 250A 1210 |
9509 |
|
 |
Elco (AVX) |
VARISTOR 34.5V 30A 0603 |
4000 |
|
 |
Elco (AVX) |
VARISTOR 51V 180A 1206 |
2000 |
|
 |
Elco (AVX) |
VARISTOR 8.5V 30A 0603 |
0 |
|
 |
Elco (AVX) |
VARISTOR 6.8V 20A 0402 |
0 |
|
 |
Elco (AVX) |
VARISTOR 33V 300A 1210 |
0 |
|
 |
Elco (AVX) |
VARISTOR 5V 40A 0805 |
8440 |
|
 |
Elco (AVX) |
VARISTOR 60.5V 220A 1210 |
2 |
|
 |
Elco (AVX) |
VARISTOR 12.7V 30A 0805 |
1000 |
|
 |
Elco (AVX) |
VARISTOR 25.5V 500A 1210 |
0 |
|
 |
Elco (AVX) |
VARISTOR 68V 500A 1812 |
0 |
|
 |
Elco (AVX) |
TRANSGUARD |
10000 |
|
 |
Elco (AVX) |
VARISTOR 180V 1A 0402 |
9199 |
|
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: