Electronic equipment manufacturing anti-static technical requirements

1. Subject content and scope of application This standard stipulates the basic requirements for the protection of electrostatic discharge hazards during the entire process of the development and production of electronic equipment; the requirements for anti-static operations during the procurement, testing, storage, transportation, and assembly of electrostatic sensitive devices. Anti-static work area management and personnel education and training.

This standard applies to the protection of static electricity in the development, production, maintenance of electronic equipment and the purchase, storage and transportation, and testing of electronic components.

2 Reference standards

GB 2887-89 Calculation station site technical conditions

GB4385-1995 Technical requirements for anti-static rubber-soled shoes and conductive rubber-soled shoes

GB12014-89 anti-static work clothes

Design Code for Communication Grounding of Industrial Enterprises

GJB1210 grounding, overlapping and shielding design implementation

GJB1649-1993 Electronic products anti-static discharge control program

3 term

3.1 electrostatics electrostatics

Excess or insufficient static charge on the surface of an object.

3.2 Electrostatic discharge (ESD)

A phenomenon in which the energy of the electrostatic electric field reaches a certain level, and then it breaks down its basic properties and discharges.

3.3 Electrostatic susceptivity

The electrostatic discharge voltage value that the component can withstand.

3.4 Static sensitivity device (SSD)

Devices sensitive to electrostatic discharge cancer.

Note: Refer to Appendix A of GJB l649-93 for the sensitivity classification of electrostatic sensitive devices.

3.5 Leakage

Safely conduct static charges to the ground.

3.6 Neutralization

Use conductive charge to make static electricity disappear.

3.7 electrostatic conductor

Approved by the Ministry of Electronics Industry of the People's Republic of China on August 08, 1994, December 01, 1994, the implementation of SJ /T 10533-94 for objects with a surface resistance value of 105-1010

3.8 Grounding ground g

Electrically connected to objects that can provide or receive a large amount of electrical charge (such as the earth, the metal shell of ships or vehicles, etc.).

3.9 Static safe area

A work site formed by various anti-static facilities, devices and clear regional boundaries.

4 Basic requirements

4.1. Basic principles of electrostatic protection

a. Inhibit the accumulation of static charge;

b. Quickly, safely and effectively eliminate the static charge that has been generated.

4.2 Anti-static work area

4.2.1 Floor materials

4.2.1.1 It is forbidden to directly use wooden floors or to lay wool, hemp, chemical fiber carpets and ordinary floor leather.

4.2.1.2 The ground made of electrostatic conductor materials, such as anti-static raised floor or laying anti-static mats on ordinary ground, should be selected and grounded effectively.

4.2, 1.3 It is allowed to use specially treated terrazzo ground, such as laying ground wire in advance, carburizing or spraying antistatic agent on the ground.

4.2.2 Grounding

4.2.2.1 The anti-static system must have an independent and reliable grounding device, the grounding resistance should generally be less than 10Ω, and the burying and testing methods should meet the requirements of GJB1210.

4.2.2.2 The anti-static ground wire must not be connected to the power neutral wire or shared with the lightning protection ground wire.

4.2.2.3 Use a three-phase five-wire system for power supply, and its earth wire can be used as an anti-static ground wire (but the neutral wire and the ground wire must not be mixed).

4.2.2.4 The cross-sectional area of ​​the grounding trunk line should be no less than 100mm2, and the cross-sectional area of ​​the branch trunk line should be no less than 6mm2. The grounding wires of equipment and workbenches should use multi-stranded plastic-coated wires with a cross-sectional area no less than 1.25mm2. The color of the grounding wire The yellow-green line is appropriate.