| Image | Part Number | Description / PDF | Quantity | Rfq |
|---|---|---|---|---|
 |
Stackpole Electronics, Inc. |
VARISTOR 270V 4.5KA DISC 14MM |
0 |
|
 |
Stackpole Electronics, Inc. |
VARISTOR 39V 800A 1812 |
2975 |
|
 |
Stackpole Electronics, Inc. |
VARISTOR 680V 2.5KA DISC 10MM |
0 |
|
 |
Stackpole Electronics, Inc. |
VARISTOR 68V 600A 1812 |
5 |
|
 |
Stackpole Electronics, Inc. |
VARISTOR 220V 1.2KA DISC 7MM |
0 |
|
 |
Stackpole Electronics, Inc. |
VARISTOR 430V 1.2KA DISC 7MM |
0 |
|
 |
Stackpole Electronics, Inc. |
VARISTOR 39V 400A 1210 |
30945000 |
|
 |
Stackpole Electronics, Inc. |
VARISTOR 47V 200A 1206 |
0 |
|
 |
Stackpole Electronics, Inc. |
VARISTOR 470V 2.5KA DISC 10MM |
0 |
|
 |
Stackpole Electronics, Inc. |
VARISTOR 240V 1.2KA 2SMD JLEAD |
0 |
|
 |
Stackpole Electronics, Inc. |
VARISTOR 270V 1.2KA DISC 7MM |
0 |
|
 |
Stackpole Electronics, Inc. |
VARISTOR 100V 400A 1812 |
0 |
|
 |
Stackpole Electronics, Inc. |
VARISTOR 390V 2.5KA DISC 10MM |
0 |
|
 |
Stackpole Electronics, Inc. |
VARISTOR 150V 500A 2220 |
0 |
|
 |
Stackpole Electronics, Inc. |
VARISTOR 56V 120A 1206 |
0 |
|
 |
Stackpole Electronics, Inc. |
VARISTOR 47V 800A 1812 |
0 |
|
 |
Stackpole Electronics, Inc. |
VARISTOR 27V 200A 1206 |
75000 |
|
 |
Stackpole Electronics, Inc. |
VARISTOR 240V 4.5KA DISC 14MM |
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: