In the manufacture of fast pcb assembly electronic products, electrostatic discharge tends to damage the device and even cause the device to fail and serious losses. As the integration of ICs continues to increase, components become smaller and smaller, and the density of pcb assembly is constantly escalating. The impact of static electricity is more serious than ever. According to relevant statistics static electricity accounts for 8% to 33%,among the factors that cause the failure of electronic products, and the annual loss of static electricity is as high as 100 million US dollars. Therefore, electrostatic protection in fast pcb assembly is very important.
In order to effectively prevent static electricity in fast pcb assembly production and reduce the loss caused by static electricity, it is necessary to educate all employees in the production line of fast pcb assembly to improve the anti-static basic knowledge, and to improve the anti-static awareness of each employee and consciously abide by Anti-static system. Here are some knowledge about static electricity.
(1) Electrostatic (Electrostatic)
Static electricity is a static charge that is excessive or insufficient on the surface of an object. It is an electrical energy that remains on the surface of an object; it is the result of the imbalance of positive and negative charges in a localized range, which is formed by the conversion of electrons or ions. Electrostatic phenomenon is a general term for electrical phenomena generated during the generation and disappearance of electric charges, such as triboelectric charging and human body electrification.
(2) Electrostatic discharge (ESD)
Electrostatic Discharge (ESD) is a phenomenon in which electricity generated by a static power source quickly discharges after entering an electronic assembly. Damage to components occurs when electrical energy is in contact with or close to electrostatically sensitive components.
(3) Electrical overload (EOS)
Electrical Overstress (EOS) is the result of some additional electrical energy that causes component damage. There are many sources of such damage, such as power production equipment, tools, and ESD generated during operation.
(4) Electrostatic sensitive components (SSD)
Components sensitive to electrostatic reactions are called Electrostatic Sensitive Devices (SSD). SSDs are mainly VLSIs, especially metallized film semiconductors (MOS circuits). The SSD is divided into three levels based on the electrostatic limit voltage value (also known as electrostatic sensitivity) that the SSD can withstand and does not damage.