Efficient and correct implementation scheme for ESD protection
In the manufacturing process of the electronic manufacturing industry, ESD protection work will fail if it is accidentally. There are many reasons for the basic rules of protection. In the production process, everyone should pay attention to every detail. Eliminate static electricity and start from the source to control the generation of static electricity. And accumulate, use low-static materials to eliminate or limit the insulating materials, adopt static elimination or suppression means, control the discharge process, avoid unnecessary contact with electrostatic sensitive devices during production, especially in the pin parts, avoid electrostatic sensitive devices "Jinshi contact", the replacement of static dissipative materials, the protection of the electrostatic sensor melodious, ESD protection design of electrostatic sensitive devices, the use of electrostatic protection packaging during the turnaround process
First, the ESD protection target of electronic devices
ESD protection of electronic devices should enable electronic devices to respond to ESD occurrences without causing electronic devices to fail.
1. For energy-sensitive electronic devices, the ESD protection goal is that ESD does not cause the heat generated inside the electronic device to exceed its large tolerance.
2. For voltage-sensitive electronic devices, the ESD protection target is that ESD does not lead to voltage differences generated by the internal structure of the electronic device beyond its large tolerance.
In the electronics industry, ESD protection goals can be determined based on the ESD sensitivity of the electronic device. That is, as long as the ESD can be controlled beyond the ESD sensitivity level of the electronic device, such ESD protection can be effective and sufficient. of.
Second, the basic strategy for electronically reporting ESD protection of electronic devices in the industry
ESD protection of electronic devices can be solved separately in several aspects
1. Enhance the ESD tolerance of electronic devices and reduce their ESD sensitivity
A. Add ESD protection design inside the electronic device.
B. In the production process, ESD protection packaging is adopted for electronic devices.
2. Control the generation or accumulation of static electricity
A, suppress the generation or accumulation of static electricity
B. Appropriate elimination or suppression of static electricity generated or accumulated
3. Control the electrostatic discharge process
A. Avoid unnecessary non-essential contact with the electrical pins and pins of electronic devices, especially “metal contact”.
B. The surface of the material directly contacting the electronic device should meet the safe electrostatic discharge requirement (static dissipative)
For most electronic devices, as long as any of these three aspects are effectively controlled (electronic device ESD sensitivity), it is sufficient to effectively protect the electronic device ESD.
3. The technology of ESD protection in the electronics manufacturing industry
1. The technology of adding ESD protection inside electronic devices
2. Limit the production operation of ESD-sensitive electronic devices to special electrostatic protection areas.
3. Construct an ESD protection station in the ESD protection area to provide effective protection for ESD-sensitive electronic device operation.
4. Establish an electrostatic grounding or equipotential bonding system in the ESD protection area.
5. Persons in the ESD area perform electrostatic grounding or equipotential bonding
6. Use low-static materials as much as possible to replace high-static materials such as insulation.
7. Direct contact with the surface of the material of ESD-sensitive electronic devices, as far as possible to meet the surface resistance characteristics of static dissipative
8. Electrostatic protection zone can be ionized and electrostatically neutralized as a secondary or auxiliary means of static control.
9. Electrostatic protective packaging for ESD-sensitive electronic devices
10. In the static protection area, the specific range of environmental humidity can be controlled as an auxiliary means of static control.
11. ESD sensitive electronic devices and areas related to ESD protection, materials are properly labeled to facilitate effective and correct implementation of ESD protection.