Introduction
PCBA refers to Printed Circuit Board Assembly, meaning the process of placing components on the board through SMT or THT PCB assembly
PCBA board has many precisions electronic components, which are sensitive to voltage. Higher than the rated voltage shock will damage these components, resulting in functional testing of the PCBA when it is difficult to check, leading to defects when delivered to customers, bringing a lot of rework pressure.
So in the PCBA fabrication process of electrostatic protection is crucial. Doing a good job of electrostatic protection can effectively protect the electronic components.
What is Electrostatic Discharge?
ESD, Electrostatic Discharge is an electrical charge at rest. Human electrostatic momentary current can reach more than 10,000 volts, and rubber, plastic film surface electrostatic is up to 100,000 volts.
The basic physical properties of static electricity are: attraction or repulsion, and the earth has a potential difference, will produce a discharge current.
These three characteristics can be three effects on electronic components are
- Dust, reducing the insulation resistance of components (shorten the life).
- Damage, resulting in electronic components cannot work.
- Amplitude of the electromagnetic field is very large (up to several hundred volts / m) extremely wide spectrum (from tens of megawatts to several gigawatts), causing interference and even damage to electronic products (electromagnetic interference)
What are the effective electrostatic protection measures?
(1) Operators should wear anti-static wristbands when operating.
(2) The human body through anti-static shoes (or shoelaces) and anti-static floor grounding, it should comply with the relevant provisions of GB4385-1995; general circumstances allow the wearing of ordinary shoes, but should be used at the same time conductive shoe bundle or heel strap.
(3) Anti-static work clothes, it should comply with the provisions of GB12014-2009. In an environment where the relative humidity is greater than 50%, they are allowed to choose pure cotton products.
(3) Work surface grounding.
(4) Test instruments, tool clamps, soldering iron grounding.
(5) Anti-static floor, ground (table) mat, trolley, box, frame, and chair
Attention:
- All components must be operated on the anti-static safety workbench.
- If the operation inadvertently electrostatic sensitive components dropped on the ground, must be tested before use
- When holding sensitive components by hand, direct contact with their leads and lug should be avoided. When taking the motherboard should avoid contact with the sensitive component area.
To sum up
In short, all objects in contact with the board or components, should have anti-static measures.
KingPCB as one of the leading PCB manufacturer, provide various anti-static operating system to provide best quality to our customers.
Contact us today to get more information about our measures!
