Importance of ESD anti-static control and common protection methods of ESD anti-static access control

1, the importance of ESD anti-static control

Although the discharge voltage of ESD may be as high as several thousand volts, due to the limited power, the discharge time is completed in an instant, so the damage is often the breakdown of the semiconductor dielectric layer and the semi-melting of the metal layer, which is difficult to be directly found in the later detection, but the damage often makes the product appear in the hands of the end users, which is the last thing we can accept; Secondly, the economic losses caused by ESD will be amplified step by step with the industrial chain. ESD directly damages components, but with the assembly and integration of products, products and systems will eventually be affected, and the losses will be amplified step by step, and the claims caused by upstream enterprises to downstream customers will far exceed the value of their products; Finally, and most importantly, ESD control is not a simple technical problem, but a systematic project, involving material technology, quality management, reliability analysis, employee training, inspection and audit. ESD control level actually reflects its reliability and quality management level, so it becomes one of the core conditions that EMS customers pay attention to when choosing suppliers.

2. Common methods of 2.ESD electrostatic protection

It can be seen that anti-static measures are very important in the electronic industry. The main anti-static methods are electrostatic leakage, dissipation, neutralization, humidification, shielding and grounding. The common ways are to build an anti-static production environment and operation and packaging methods, adopt anti-static floors, anti-static tables and chairs, anti-static materials, ion fans, shielding bags and various grounding systems, and wear anti-static caps, anti-static wristbands and anti-static shoes to strengthen ESD protection, so as to reduce the harm of electrostatic discharge and ensure the improvement of product quality and yield. Human body is the most common source of electrostatic hazard in the production environment of electronic industry. For static electricity, the human body is a conductor, so the main anti-static measures are to strengthen the grounding measures for the human body. The most common methods are: using anti-static floor, anti-static shoes and socks (static electricity is conducted from feet to the ground) and wearing anti-static wrist strap and grounding (static electricity is conducted from hands to the ground). It can be seen that in addition to the construction of the standard anti-static floor, it is particularly important to detect the anti-static of personnel, mainly using the human static comprehensive tester to detect whether the anti-static wrist strap and anti-static worn by personnel are within the standard range, neither too low nor too high. Why not too low? From the anti-static point of view, the smaller the total resistance to ground, the better. However, the minimum value is limited by safety. The human body must have a certain resistance value to the ground, so that the resistance can limit the current flowing through the operating human body in the case of short circuit between the metal equipment or device and the power frequency power supply, so if it is too low, work safety accidents may occur when leakage occurs. Too high? If the wrist strap or anti-static shoes exceed the high value of the standard resistance value, the static electricity generated by the human body cannot be normally led out through the wrist strap or anti-static shoes, and electronic components may be harmed by electrostatic discharge. Therefore, it is an important step to wear anti-static wrist strap and anti-static shoes correctly and ensure that they are normal without failure.