What are the possible hazards of ESD during SMT processing?

2020-12-14 11:32:26 hongling

ANSI/ESD S20.20 is the most authoritative standard for electrostatic protection in the international electronics industry during the SMT production and processing of electronic products of the American Electrostatic Discharge Association. It is the only certification of the electrostatic discharge protection standard. Among them, the company has passed ANSI/ESD S20.20 certification, indicating that static electricity has been strictly controlled in production, thereby ensuring product quality and ensuring product reliability.


    Static electricity and electrostatic discharge are everywhere in our daily lives, but when used in electronic equipment, it may cause serious damage to electronic equipment. With the rapid development of electronic technology, electronic products have become more and more powerful and small in size, but this is the cost of electronic components that are electrostatically sensitive. This is because high integration means that the circuit unit will be narrower and the tolerance of the electrostatic discharge capability is getting worse and worse. In addition to a large number of new materials, special devices are also static sensitive materials, so that electronic components, especially semiconductor devices, are SMT chip processing production, assembly and maintenance environment static control requirements are getting higher and higher.


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On the other hand, in the SMT processing, production, use and maintenance of electronic products, various polymer materials that are prone to static electricity will be used in large quantities. This undoubtedly brings more problems and challenges to the electrostatic protection of electronic products. .


   There are two types of damage and damage to electronic products caused by electrostatic discharge: sudden damage and potential damage. The so-called sudden damage refers to the severe damage of the device and loss of function. This kind of damage can usually be found in the quality inspection during the production process, so the main cost to the factory is the cost of rework and repair.


   Potential damage is the damaged part of the device, the function has not been lost, and can not be found in the production process of testing, but in use will make the product unstable, good or bad, so the quality of the product constitutes a greater s damage. Among these two types of damage, potential failures account for more than 90%, and sudden failures account for only 10%. That is, 90% of static electricity damage is undetectable, only the user's hand will be found in the hand. Problems such as frequent crashes, automatic shutdown, poor call quality, loud noise, good time difference, critical errors and other problems mostly involve static damage. Because of this, electrostatic discharge is considered to be the biggest potential killer of electronic products, and electrostatic protection has also become an important part of the quality control of electronic products. The difference in using domestic and foreign brand mobile phones is mainly reflected in the differences in their electrostatic protection and product anti-static design.


   In fact, the electronics industry has a long history of static electricity. From the emergence of electronic products, especially transistors, this issue has begun to be recognized and valued by companies and countries. The study of static electricity and electrostatic protection has gradually evolved into a new edge subject, forming modern electrostatic engineering and electrostatic protection engineering, including electrostatic principles and models, electrostatic discharge, electrostatic devices, electrostatic hazards and their protection, and related electrostatic measurement technologies. The rapid development.