The circuit of the integrated circuit component is reduced, the withstand voltage is reduced, and the circuit area is reduced, so that the electrostatic shock resistance of the device is weakened, and the electrostatic electric field (Static Electric Field) and the electrostatic current (ESDcurrent) become the deadly killers of these high-density components. At the same time, the widespread use of a large number of high-insulation materials such as plastic products has led to an increase in the chance of generating static electricity. Static electricity can be generated in daily life such as walking, air flow, and handling. It is generally believed that only CMOS-type wafers are sensitive to static electricity. In fact, highly integrated component circuits are sensitive.
A. The effect of static electricity on electronic components
1. Electrostatic adsorption of dust, changing the impedance between the lines, affecting the function and life of the product.
2. The element is inoperable (completely destroyed) due to the electric field or current destroying the insulation or conductor of the component.
3. The heat generated by the instantaneous electric field or current, the component is injured, still working, and the life is damaged.
B. Characteristics of electrostatic damage:
1. Concealed human body cannot directly sense static electricity, unless electrostatic discharge occurs, but electrostatic discharge occurs, and the human body may not have the feeling of electric shock. This is because the human body perceives an electrostatic discharge voltage of 2-3 kV.
2, latent performance of some electronic components after electrostatic damage, there is no significant decline in performance, but multiple accumulation of discharge will cause internal damage to the device, and increase the sensitivity of the device to static electricity. There are no cures for the problems that have arisen.
3. Under what circumstances will random electronic components suffer electrostatic damage? It can be said that all processes from the time of production of a component until it is damaged are threatened by static electricity, and the generation of such static electricity is also random. Due to the generation and release of static electricity
Electricity is instantaneous, and difficult to predict and protect.
4, complex electrostatic discharge damage board work, due to the fine, small structural features of electronic products, time-consuming, laborious, costly, requires more sophisticated technology often requires the use of scanning electron microscopes and other precision instruments, even so some electrostatic damage It is difficult to distinguish from the damage caused by other causes, causing people to mistake the electrostatic damage as other failures. This is often caused by early failure or unclear failure before the electrostatic discharge damage is not fully recognized, and thus unconsciously concealed. The real reason for failure.
5. Severity ESD problems seem to affect only the users of finished products, but actually affect manufacturers at all levels, such as: warranty, maintenance and company reputation.
