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Insulative materials prevent or limit the flow of electrons across their surface or through their volume. Insulative materials have a high electrical resistance and are difficult to ground, thus are not ESD materials. Static charges remain in place on these materials for a very long time.
Examples are computer CPUs, graphics ICs. Computer cards; TTL chips; Laser diodes; Blue light-emitting diodes (LEDs) High precision resistors; The notion of a symbol for an ESD protection device came about in response to the increased usage and failures of static sensitive components by then the computer systems manufacturer, Sperry Univac.
Electrostatic discharge (ESD) is a sudden and momentary flow of electric current between two differently-charged objects when brought close together or when the dielectric between them breaks down, often creating a visible spark associated with the static electricity between the objects.
An antistatic device is any device that reduces, dampens, or otherwise inhibits electrostatic discharge, or ESD, which is the buildup or discharge of static electricity. [1] [2] ESD can damage electrical components such as computer hard drives, and even ignite flammable liquids and gases.
ESD (gene), a human gene/enzyme; Electrostatic discharge, a sudden flow of electricity between two electrically charged objects; Electrostatic-sensitive device, any component which can be damaged by common static charges; Energy spectral density, a part of a function in statistical signal processing
Note the two recurring ESD symbols An antistatic bag is a bag used for storing electronic components, which are prone to damage caused by electrostatic discharge (ESD). These bags are usually plastic polyethylene terephthalate (PET) and have a distinctive color (silvery for metallised film , pink or black for polyethylene ).
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Warning label for an electrostatic sensitive device, denoting the devices susceptibility to damage. A similar symbol without the bar and with a black "dome" denotes ESD-safe equipment. The human-body model (HBM) is the most commonly used model for characterizing the susceptibility of an electronic device to damage from electrostatic discharge ...