PCB Technical - Pay attention to anti-static methods during pcba processing

PCB processing is a very common integrated processing technology in the electronic processing industry. Because PCB processing often involves many electrostatic sensitive electronic components, some of the processing technologies also have certain requirements for the protection of static electricity. Therefore, the protection requirements for static electricity in PCB processing are necessary and high. Electrostatic warning signs should be posted on the processing workshop, equipment, components or packaging to remind the staff to pay attention to electrostatic discharge or electrical overload during operation. In addition, what are the anti-static requirements?

1. Workshop anti-static requirements

According to the requirements of product production level, the production workshop should be equipped with corresponding anti-static facilities, and the ground wire should be independent and reliable. Keep constant temperature and humidity in the workshop. Separate static safe working areas, and affix obvious anti-static warning signs. The grounding system outside the workshop is inspected once a year, and the grounding systems such as the floor/mat, workbench, etc. in the workshop shall be inspected once every six months, and corresponding records shall be made. The temperature and humidity in the workshop are respectively controlled at (25±2) degree Celsius and 65%±5%RH; measure twice a day and make corresponding records.

2. Requirements for employees' electrostatic protection

1. To enter the anti-static area, you must wear anti-static overalls and anti-static shoes as required;

2. Before touching electrostatic sensitive components, you must wear a grounding wrist strap or grounding foot strap as required, and pass the corresponding electrostatic test;

3. Items that are prone to static electricity are prohibited from being brought into the anti-static area;

4. The handling, storage and distribution of electrostatic sensitive components must be stored in anti-static packaging;

5. The anti-static package can only be opened after the corresponding anti-static measures have been taken;

6. The trolleys and shelves used in the anti-static area must have proper grounding devices;

7. Anti-static work clothes and work shoes are prohibited from being worn out of the work area, and cleaned regularly according to regulations;

8. The cleaning of the anti-static work surface must use a cleaning agent approved by the electrostatic protection personnel;

9. Avoid placing static sensitive components and circuit boards with plastic products or tools (such as computers and computer terminals);

10. Connect all tools and machines to the ground;

11. Use static protection table mats;

12. Employees who do not wear a wristband approach the static protection workstation;

13. Immediately report all possible causes of electrostatic damage.

3. Matters needing attention during operation

1. Touch the work surface with both hands before holding the component, so that the static electricity on your hands is transmitted to the ground through the anti-static work surface;

2. Place the device pin down on the table to dissipate static electricity;

3. When holding an integrated circuit, you should grasp the body of the integrated block, not the pins;

4. When operating electronic components, they should be held on the edge of the PCB, and do not directly touch the components or the circuit on the board;

5. Do not drag or slide electronic components on any surface;

6. The non-conductor should keep a distance of more than 1m from the static safe working area;

7. Only take out the components and PCB circuit boards from the anti-static packaging box in the static safe working area;

8. Put the static sensitive components that are not in use temporarily in an antistatic container or packaging box;

9. Reduce the handling frequency to a lower limit.