| Image | Part Number | Description / PDF | Quantity | Rfq |
|---|---|---|---|---|
 |
Wickmann / Littelfuse |
VARISTOR 8.2V 30A 0603 |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 47V 100A 2SMD NO LEAD |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 360V 4.5KA DISC 14MM |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 68V 4KA DISC 14MM |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 47V 500A DISC 5MM |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 25V 150A 1206 |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 470V 20KA BOX 5 LEAD |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 820V 20KA BOX 5 LEAD |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 430V 10KA DISC 20MM |
66 |
|
 |
Wickmann / Littelfuse |
VARISTOR 60.5V 180A 1206 |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 430V 6.5KA DISC 20MM |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 270V 10KA DISC 20MM |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 715V 3.5KA DISC 10MM |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 282V 40KA SQUARE 34MM |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 690V 40KA DISC 40MM |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 820V 40KA AXIAL CYLINDR |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 33V 1KA DISC 14MM |
4420 |
|
 |
Wickmann / Littelfuse |
VARISTOR 25V 0805 |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 854.5V 40KA SQUARE 34MM |
0 |
|
 |
Wickmann / Littelfuse |
MULTI-LAYER VARISTOR SMD |
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: