What are the phenomena and causes of frequent damage to TVS on the circuit

TVS (Transient Voltage Suppressor) is a component used to protect circuits from overvoltage surges. Almost all electronic devices require TVS for circuit protection.

If TVS is frequently damaged in the circuit, there may be several possible reasons:

1. Overcurrent: When overcurrent occurs in a circuit, a circuit that is in an overload state for a long time may cause damage to the TVS. This can cause damage. Overcurrent may be caused by short circuits, overloads, or other faults.

2. Overvoltage: The function of TVS is to absorb overvoltage and transfer it to the ground wire, protecting other electronic components from damage. TVS has a maximum operating voltage, and if the transient voltage in the circuit exceeds the rated voltage range of TVS, it will cause TVS failure. This may be caused by sudden overvoltage in the power supply, lightning strikes on the line, or other power supply issues such as hot swapping.

3. Temperature issue: Excessive temperature may cause damage to TVS. If the heat dissipation of the circuit is poor or the ambient temperature is too high, TVS may not be able to effectively dissipate heat, resulting in overheating and damage.

4. Low quality TVS: Low quality TVS components have manufacturing defects, such as substandard materials, welding problems, or other issues during the manufacturing process, which may lead to damage.

5. Continuous voltage exceeding rated time: TVS is usually able to quickly respond to voltage sudden changes and transient overvoltage, but if the voltage duration is long and exceeds the withstand range of TVS, it may also cause damage.

6. Inappropriate parameter selection: may cause it to be easily damaged. Choosing appropriate TVS components is crucial for the stability and protection of the circuit.

7. Electromagnetic interference: strong electromagnetic field or Electromagnetic pulse may interfere with TVS, which is beyond its bearing range, causing damage.

The methods to solve these problems include the following:

1. Ensure that the circuit design is reasonable, carefully consider the power requirements, transient voltage characteristics, and environmental conditions of the circuit during the design phase, select appropriate TVS components, and select the rated voltage and power range based on actual needs.

2. Use appropriate installation methods and insulation measures to reduce the impact of temperature and voltage, ensuring that TVS can effectively dissipate heat.

3. Use reliable TVS components to avoid low-quality products.

4. Consider using other protective measures, such as fuses or fuses, to disperse overvoltage surges.

5. Regularly check the working status of the circuit and TVS to ensure their normal operation. If any problems are found, replace the damaged TVS in a timely manner.

Take appropriate shielding and isolation measures in environments where electromagnetic interference may exist.

In short, through reasonable design and use, the risk of TVS damage can be minimized and the stability and reliability of the circuit can be improved.

Shanghai Leiditech Electronics provides a variety of packaged and high-power TVS to meet customer needs.

Shanghai Leiditech Electronics provides various signal and power protection solutions.

Shanghai Leiditech focuses on electromagnetic compatibility design of electronic products. Overvoltage protection devices are required for electronic product interface protection. Many engineers are aware of the need for protection devices, but due to improper selection or failure to design according to ESD circuit PCB design principles, the product fails static or EMC testing, wastes manpower and financial resources, and delays the product's launch. Alternatively, excessive design increases unnecessary costs.

Leiditech Electronics provides customers with electromagnetic compatibility EMC design services, providing laboratory testing for free, efficient and cost controlled design. We strive to quickly pass EMC projects and improve product reliability.

Leiditech Electronic Electromagnetic Compatibility Laboratory provides free testing, peripheral electrostatic protection reference circuits, and domestic certification documents. Contact person Hu Gong 18016225001.