Electrostatic discharge (ESD) is the release of static electricity when two objects come into contact. Familiar examples of ESD include the shock we receive when we walk across a carpet and touch a metal doorknob and the static electricity we feel from clothes coming out of the dryer. Lightning is also electrostatic discharge.
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While most of ESD events are harmless to the human body, they can cause challenging and expensive problems in certain industrial environments. Static electricity is a problem for electronic and medical device manufacturing, vehicle fabrication, industries that use plastics and paper, and ones that need clean room environments. ESD issues can slow production, negatively affect product quality issues, attract contaminants and create safety issues.
An ESD event reflects a buildup of an electrostatic charge. This occurs when two different conductive materials, or conductors, rub together. One of the materials becomes positively charged; the other takes on a negative charge. The positively charged material now has an electrostatic charge. When the electrically charged object comes into contact with another conductive material, such as a Styrofoam cup or plastic bag, a static charge is transferred and an ESD event occurs.
High voltage isn't necessarily the issue with ESD. Many electronic devices are susceptible to low voltage ESD damage. For example, hard drive components are sensitive to 10 volts of electrostatic discharge.
The heat from an ESD event can be extremely hot, although we might not feel the heat when we are shocked. However, when the static discharge is released onto an electronic device, such as a semiconductor or an expansion slot or card, the heat from the charge can melt or vaporize the tiny parts, causing the part to fail.
Sometimes an ESD event can damage sensitive devices, but they continue to function. This is called a latent defect, which is hard to detect but ultimately shortens the life of the device.
Heat in a data center can contribute to electrostatic discharge issues.
Electrostatic discharges can occur without warning. Prevention requires understanding the environment in which an electronic device is manufactured, handled and used, and taking measures to reduce the likelihood of an event.
Electronics manufacturers incorporate various ESD protection measures to prevent issues in the manufacturing process, which includes fabricating, testing, shipping and handling. ESD preventive measures include the following:
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The ESD susceptibility symbol indicates that a device or assembly could be damaged by an ESD event.
Knowing that an ESD can potentially damage electronic equipment makes it essential to include antistatic measures as part of daily IT operations.
Various standards help address ESD control issues and create protected areas. They define the sensitivity of the products to ESD and the requirements for specific measures in environments where electrostatic fields are a problem.
ESD standards are voluntary in the United States but can be included in sales agreements and other contracts. The EOS/ESD Association is accredited by ANSI to develop ESD standards and testing methods. The following are some of the ESD standards available:
Learn the best practices and safety standards involved in creating a comprehensive electrical safety strategy to keep your data center free of electrical hazards and protect sensitive components.
ESD (electro static discharge) is the transfer of an electrical charge between two electrically charged objects. A well-known example of ESD is the shock you receive after walking across a carpet and touching a metal door handle. However, the heat generated by ESD can cause significant problems in industrial applications, including damage to and failure of electronic components.
Regardless of whether you work in the electronics industry, with any products that ESD can affect, or if static damage is a new problem you face, this guide provides a detailed overview and steps that you can take to mitigate its impact.
It includes:
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