一. Terms and definitions

  1.Static electricity: excess or insufficient static charge on the surface of an object
  2.An electric field formed by static electricity around it
  3.Electrostatic discharge: transfer of electrostatic charge between two objects with different electrostatic potentials due to direct contact or electrostatic field induction. When the energy of the electrostatic field reaches a certain level, the phenomenon of breaking through the medium and discharging is electrostatic discharge.
  4. Electrostatic sensitivity: electrostatic discharge voltage that components can withstand
  5. Electrostatic sensitive device: a device sensitive to electrostatic discharge
  6. Grounding: electrically connected to an object that can supply or receive a large amount of electric charge, such as the earth, a ship, etc
  7.Neutralization: the use of opposite charges to eliminate static electricity
  8.Anti static work area: it is equipped with various anti-static equipment and equipment, which can limit the electrostatic potential, and is suitable for electrostatic protection operation with clear regional boundaries and special marks


  二、Generation of static electricity:

   1.Friction: in daily life, any two objects of different materials can generate static electricity after contact and separation, and the common method of generating static electricity is friction to generate electricity. The better the insulation of the material, the  easier it is to generate electricity by friction. In addition, static electricity can also be generated when any two different substances are contacted and separated.

   2. Induction: for conductive materials, since electrons can flow freely on its surface, if they are placed in an electric field, the positive and negative ions will be transferred due to the repulsion of the same sex and the attraction of the opposite sex.
   3. Conduction: for conductive materials, since electrons can flow freely on its surface, if they contact with charged objects, charge transfer will occur.

  三、Influence of static electricity on electronic industry

    The circuit of integrated circuit components is reduced, the withstand voltage is reduced, and the circuit area is reduced, which weakens the static impact resistance of the components. The static electric field and the electrostatic current become fatal * * of these high-density components. At the same time, a large number of high insulation materials such as plastic products are widely used, resulting in a large increase in the chance of generating static electricity. Static electricity can be generated in daily life such as walking, air flow, handling, etc. It is generally believed that only CMOS chips are sensitive to static electricity. In fact, highly integrated components and circuits are very sensitive.

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