PCBA Tech - What are the hazards of static electricity in SMT processing?

Static electricity and electrostatic discharge are ubiquitous in daily life, but when used in electronic equipment, it may cause serious damage to electronic equipment. Static electricity has been strictly controlled in the SMT chip processing and production process. This is because high integration means The circuit unit will become 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 processed and assembled for SMT. And maintenance environment static control requirements are getting higher and higher.

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 cannot be found during the production process of testing, but the product will become unstable during use, 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, and only the user's hand will be found in the hand, such as frequent crashes, automatic shutdown, poor call quality, large noise, good time difference, critical errors and other problems mostly related to static electricity 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 the use of domestic and foreign brand mobile phones is mainly reflected in the differences in their electrostatic protection and product anti-static design.

In fact, the SMT chip processing electronics industry has a long history of static electricity, and the study of static electricity and static electricity protection has gradually evolved into an emerging edge discipline, forming modern static electricity engineering and static electricity protection engineering, including the principle of static electricity and the model of static electricity Devices, electrostatic hazards and their protection, and related electrostatic measurement technologies have been rapidly developed.