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How to judge the quality of MOS tube?

Why do electronic components suffer from electrostatic damage?

In fact, the whole process of electronic products from production to use is threatened by electrostatic damage. From device manufacturing to plug-in assembly and welding, whole machine assembly, packaging and transportation to product application, they are all under the threat of static electricity. In the whole production process of electronic products, at every small step in every stage, electrostatic sensitive elements may be affected or damaged by static electricity.

In the whole production process of electronic products, the most important and easy to neglect point is the process of transmission and transportation of components. In this process, transportation is damaged by static electricity caused by easy exposure to external electric fields (such as near high-voltage equipment, frequent movement of workers, rapid movement of vehicles, etc.), so special attention should be paid to the process of transmission and transportation. to reduce losses and avoid indifferent disputes.

The basic physical characteristics of static electricity are: it has the force of attraction or repulsion; there is an electric field and there is a potential difference with the earth; it will produce discharge current. These three situations have the following effects on electronic components:

1. The element absorbs dust, changes the impedance between lines, and affects the function and life of the element.

two。 The element cannot work (completely destroyed) because the electric field or current destroys the insulating layer and conductor of the element.

3. Due to the instantaneous electric field soft breakdown or current overheating, the element is injured, although it can still work, but the life is damaged.

In the above three cases, if the components are completely damaged, they will be detected and eliminated in production and quality testing, with less impact. If the component is slightly damaged, it is not easy to be found in the normal test, in this case, it is often found to be damaged after many times of processing, or even when it is already in use. Not only is it not easy to inspect, but also the loss is difficult to predict. After all, the harm caused by static electricity to electronic components is no less than the loss of serious fire and explosion accidents.

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