© Siemens AG, 2004. All rights reserved
EMC Installation Guideline – Planning Guide (EMV) – 03.2004 Edition
9-51
9 Electrostatically Sensitive Assemblies
(ESA)
9.1 What does ESD mean?
Definition: ESD
For technical reasons, electrical and electronic devices are highly sensitive to
overvoltages and also sensitive to discharges of static electricity.
For these Electrostatically Sensitive Components/Devices, the abbreviated
identification ESC has become established. In addition, you will find the
internationally common designation ESD for Electrostatically Sensitive Device.
Electrostatically sensitive devices are identified with the following symbol:
Identification
Caution
· Electrostatically sensitive devices can already be destroyed by voltages
which are far below human perception limits. As long as you have not
discharged when touching an assembly, you possess a dangerous voltage
for components.
· The damage which occurs on an assembly due to overvoltage cannot be
detected immediately but becomes apparent only after longer time of
operation.
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