| Image | Part Number | Description / PDF | Quantity | Rfq |
|---|---|---|---|---|
 |
Meritek |
VARISTOR 56V 500A 10MM DISC THRU |
0 |
|
 |
NTE Electronics, Inc. |
MOV 250V RMS |
1011 |
|
 |
Elco (AVX) |
VARISTOR 270V 3.5KA DISC 13MM |
0 |
|
 |
PowerStor (Eaton) |
VARISTOR SMD 2825 250V |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 360V 1.2KA 2SMD JLEAD |
81 |
|
 |
TDK EPCOS |
CT1210K20AUTOG_G |
0 |
|
 |
TDK EPCOS |
VARISTOR 750V 2.5KA DISC 10MM |
5950 |
|
 |
Panasonic |
VARISTOR 200V 1.2KA DISC 7MM |
0 |
|
 |
TDK EPCOS |
VARISTOR 56V 500A 1812 |
3609 |
|
 |
TDK EPCOS |
VARISTOR 8V 150A 1206 |
571 |
|
 |
Vishay BC Components/Beyshlag/Draloric |
VARISTOR 47V 250A DISC 9MM |
0 |
|
 |
Elco (AVX) |
VARISTOR 24.5V 1.5KA 2220 |
988 |
|
 |
PowerStor (Eaton) |
VARISTOR 45V 120A 1206 |
0 |
|
 |
TDK EPCOS |
VARISTOR 620V 15KA DISC 20MM |
636 |
|
 |
Wickmann / Littelfuse |
VARISTOR 240V 6.5KA DISC 14MM |
0 |
|
 |
TDK EPCOS |
VARISTOR 430V 25KA ENCASED DISC |
100 |
|
 |
Panasonic |
VARISTOR 150V 600A 2SMD JLEAD |
4 |
|
 |
Wickmann / Littelfuse |
VARISTOR 39V 100A 2SMD NO LEAD |
0 |
|
 |
Wickmann / Littelfuse |
VARISTOR 205V 1.75KA DISC 7MM |
0 |
|
 |
PowerStor (Eaton) |
VARISTOR SMD 2825 35V |
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: