Electrostatic discharge
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Introduction
Electrostatic discharge (ESD), caused by touching with the hand for
example, can destroy semiconductor components. The correct
operation of the complete system is then no longer assured.
Industry experience has shown that all semiconductor components can
be damaged by static electricity that builds up on work surfaces and
personnel. The electrostatic discharge can also affect the components
indirectly via contacts or conductor tracks. The electrostatic charges
are produced by various charging effects of movement and contact
with other objects. Dry air allows greater static charges to accumulate.
Higher potentials are measured in areas with low relative humidity,
but potentials high enough to cause damage can occur anywhere.
The barred-hand symbol
Circuit packs containing components that are especially sensitive to
electrostatic discharge are identified by warning labels bearing the
barred-hand symbol.
ESD instructions
Observe the following ESD instructions to avoid damage to
electrostatic-sensitive components:
•
Wear working garment made of 100% cotton to avoid
electrostatic charging.
•
Touch the circuit packs at the edges or the insertion and removal
facilities only.
•
Ensure that the rack is grounded.
•
Wear conductively connected wrist straps and connect them to
the rack ESP bonding point.
•
Work in an area which is protected against electrostatic
discharge. Use conducting floor and bench mats which are
conductively connected to the rack ESP bonding point.
•
Conductively connect all test equipment and trolleys to the rack
ESP bonding point.
Specific safety areas
Safety
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365-374-074
Issue a, April 2002
Lucent Technologies
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