| Image | Part Number | Description / PDF | Quantity | Rfq |
|---|---|---|---|---|
 |
Elco (AVX) |
VARISTOR 18.5V 20A 0402 |
0 |
|
 |
Elco (AVX) |
HIGH TEMPERATURE +150C AUTOMOTIV |
550 |
|
 |
Elco (AVX) |
VARISTOR 25.5V 20A 0805 |
0 |
|
 |
Elco (AVX) |
VARISTOR 60.5V 250A 1210 |
50 |
|
 |
Elco (AVX) |
HIGH TEMPERATURE +150C AUTOMOTIV |
8000 |
|
 |
Elco (AVX) |
TRANSGUARD |
0 |
|
 |
Elco (AVX) |
VARISTOR 8.5V 40A 0805 |
23850 |
|
 |
Elco (AVX) |
VARISTOR 82V 350A 1210 |
472 |
|
 |
Elco (AVX) |
VARISTOR 30A 0603 |
883 |
|
 |
Elco (AVX) |
VARISTOR 24.5V 1.2KA 2220 |
14881250 |
|
 |
Elco (AVX) |
VARISTOR 25.5V 30A 0603 |
18995 |
|
 |
Elco (AVX) |
VARISTOR 39V 800A 1812 |
19990 |
|
 |
Elco (AVX) |
VARISTOR 47V 800A 1812 |
3388 |
|
 |
Elco (AVX) |
VARISTOR 47V 800A 1812 |
38 |
|
 |
Elco (AVX) |
VARISTOR 28V 20A 0508 |
0 |
|
 |
Elco (AVX) |
VARISTOR 31.1V 30A 0805 |
675 |
|
 |
Elco (AVX) |
VARISTOR 17.2V 30A 0508 |
0 |
|
 |
Elco (AVX) |
VARISTOR 270V 1.75KA DISC 9MM |
0 |
|
 |
Elco (AVX) |
VARISTOR 18.5V 40A AXIAL |
1537 |
|
 |
Elco (AVX) |
VARISTOR 25.5V 30A 0805 |
202 |
|
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: