Electronic products anti-static features
With the development of miniaturization and precision of electronic products, problems caused by static electricity have become more prominent. This article introduces the characteristics of electrostatic protection of electronic products, and hopes to help everyone's static protection work.
Due to contact separation between objects (such as friction, peeling, tearing, collision in handling, etc.) or electric field induction, the accumulation of surface charges on the surface of objects due to the diffusion, transfer or migration of charged particles between objects or within the object, ie, Charge phenomenon. The existence of this phenomenon may cause the surface charge of the object to attract the particles of dust with an opposite charge in the air, resulting in a decrease in the insulation performance of the electronic sensitive component, structural corrosion or damage. When the external conditions are suitable, the accumulated electric charge will also generate electrostatic discharge, causing partial damage or breakdown of the components, and in severe cases, fire, explosion, and the like. It should be pointed out that static electricity causes damage to the local structure of electronic components and performance degradation, which is a potential threat to the service life of components, which may be more harmful than the damage caused by explosion and combustion. Because it is difficult to check, the accident is more random and easily confused with other failure causes.
At present, the development of electronic product technology, on the one hand, with the widespread use of polymer materials, the production of electrostatic phenomena has become increasingly serious; on the other hand, electronic components are increasingly miniaturized, making the danger of static electricity more and more . At present, the manufacturing of microcircuits in foreign countries has generally adopted the technology of 0.8-1.0μm, and the domestic level has reached the level of 2~3μm. This micro-machining technology and the fine structure of the product make it more sensitive to static electricity and have reached The degree that cannot be ignored.
The electrostatic protection work of electronic products has the following obvious features:
1. Ultra-fine, ultra-thin processing technology and product microstructure make it more sensitive to electrostatic discharge than other industries and products, even electrostatic discharge voltage below 20V may cause damage or damage to electronic components.
2. Static-sensitive products, such as semiconductor discrete devices, integrated circuits, thick film circuits and resistors, capacitors, piezoelectric crystals, etc., especially the first three electronic sensitive devices, can be described as the "heart" of electronic devices. In view of this, the protection against electrostatic hazards involves almost all technical fields of electronic products, especially those requiring small size, high operating frequency, and high installation density.
3. Electrostatic protection work is a systematic project involving the manufacture, assembly, processing, inspection, testing, maintenance, packaging, transportation, storage, use and other aspects of sensitive electronic products, and it is a series mode, on any link. Mistakes will lead to the failure of the entire protection work; at the same time, it is dressed with the environment in which the sensitive products are located (contact items, air atmosphere, humidity, floor, workbench, chair, processing equipment, tools, etc.) and the operator ( Including clothing, hats, shoes, gloves, wristbands, etc., there is a direct relationship, any aspect of omissions or mistakes, will lead to the failure of static protection work.
In view of the characteristics of the above-mentioned electrostatic protection work of electronic products, it is possible to formulate a series of standards that are compatible with them. A better choice is to adopt a comprehensive standardization method, from the system requirements of electrostatic protection, and consider the formulation and coordination of relevant standards. Only in this way can all aspects of the anti-static work of all aspects be included in the standard specification. The next becomes an orderly state.
In the United States, the production of military electronic products has been implemented since the 1970s. After roughly 10 years, the corresponding standards were officially issued. Since the early 1980s, the International Electrotechnical Commission (IEC) has issued anti-static standards. In contrast, the formulation and release of domestic anti-static standards is only the beginning. Although it has certain working foundations and conditions, there is still a big gap between the complete standards and the implementation of relevant standards.