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The form and characteristics of electrostatic damage to electronic products

342 Published by FASTPCBA 9月 21,2018

The form and characteristics of electrostatic damage to electronic products

The form of electrostatic damage

The basic physical properties of electrostatic are: attraction or repulsion;Potential difference with the earth;Discharge current will be generated.Based on this, there are three forms of electrostatic damage:

(1) electrostatic adsorption of dust, reducing insulation resistance of components (shortening life);

(2) damage of electrostatic discharge (ESD), resulting in damage to electronic components that cannot work (complete damage);

(3) the electromagnetic field generated by electrostatic discharge is large in amplitude (up to several hundred volts/meters), extremely wide in spectrum (thousands of megabytes are found in time), causing interference or even damage to electronic devices (electromagnetic interference).

The damage of these three forms of static electricity to electronic products can be either permanent (such as loss of function, inability to recover) or temporary (such as temporary loss of function caused by interference from electrostatic discharge);It could be a sudden failure, it could be a potential failure.Electrostatic discharge (ESD) is the most common and main cause of component damage.

electrostatic damage

Characteristics of electrostatic damage

Compared with other stresses, electrostatic damage to electronic products has the following characteristics.

(1) concealment

The human body cannot directly perceive the static electricity, unless the electrostatic discharge occurs, but the human body does not necessarily have the feeling of electric shock, because the perceived electrostatic discharge voltage of human body is 2-3kv, so the electrostatic damage is hidden.

(2) potential and accumulation

The performance of some electronic components does not decline obviously after receiving electrostatic damage, but multiple accumulative discharge will cause internal damage to the device and form hidden danger.Therefore, electrostatic damage to electronic products has potential.

(3) randomness

Under what circumstances can electronic components be damaged by static electricity?It can be said that from the moment a component is created until it is damaged, all processes are threatened by static electricity, and the generation of these static electricity is random, so the electrostatic damage is random.

(4) complexity

The failure analysis of electrostatic discharge damage is time consuming, time consuming and expensive due to the fine, fine and tiny structure characteristics of electronic products. High technology is required and high precision instruments such as scanning electron microscopy are often required.Even so, some electrostatic damage phenomenon is difficult to distinguish from other damage caused by other reasons, causing people to mistake the electrostatic damage failure as other failures.Before the damage of electrostatic discharge is fully understood, it is often attributed to the early failure or the unknown failure, which unconsciously conceals the real cause of failure.Therefore, the analysis of electrostatic damage to electronic products is complicated.

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