How to deal with the friction and static electricity of semiconductor devices
The electrostatic destruction modes of semiconductor devices are roughly divided into three types: human body charging mode, machine charging mode, and device charging mode. The charging mode of the human body is simply explained as the mode of discharge when the charge carried by the human body contacts the device. The main reason is that they are not wearing anti-static clothes and anti-static shoes and also do not have an electrostatic wrist strap to directly contact the device. The machine mode is a mode in which the charge carried by the metal device discharges when it contacts the device. It is caused by insufficient grounding of the equipment and power leakage of the electric iron. The device charging mode is a mode in which the conductor part (chip, wire, lead frame, etc.) of the device is charged with static electricity, and the device discharges when it comes into contact with equipment or tool holders. The reason is caused by frictional charging of the chip during transportation.
Electrostatic discharge protection area (EPA), sometimes referred to as safe operation area, is the core of any kind of electrostatic discharge control measures. In this area, electrostatic discharge sensitive components (ESDS) or circuit boards, or components containing these, can work safely because the amount of charge is controlled without generating destructive voltages. This area usually contains processing equipment such as workbenches or workbench groups, workstations, automatic plug-in machines or a production area. The scope of EPA must be clearly marked, and it is best to set up a fence to prevent unauthorized persons from entering. In the EPA area, materials with minimum static charge accumulation should be used, and the charge can be discharged into the ground in a controlled manner.