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1-2 ESD Precautions
Electrostatically Sensitive Devices(ESD)
Some semiconductor (solid state) devices can be (5) Do not use freon-propelled chemicals. These can
damaged easily by static electricity. generate electrical charges sufficient to damage ESD
Such components commonly are called Electros- devices.
tatically Sensitive Devices (ESD). Examples of
typical ESD devices are integrated circuits and some (6) Do not remove a replacement ESD device from its
field-effect transistors and semiconductor chip protective package until immediately before you are
components. The following techniques should be used ready to install it. (Most replacement ESD devices
to help reduce the incidence of component damage are packaged with leads electrically shorted together
caused by static electricity. by conductive foam, aluminum foil or comparable
conductive materials).
(1) Immediately before handling any semiconductor
component or semiconductor-equipped assembly, (7) Immediately before removing the protective
drain off any electrostatic charge on your body by materials from the leads of a replacement ESD
touching a known earth ground. Alternatively, obtain device, touch the protective material to the chassis or
and wear a commercially available discharging wrist circuit assembly into which the device will be
strap device, which should be removed for potential installed.
shock reasons prior to applying power to the unit
under test. CAUTION: Be sure no power is applied to the
chassis or circuit, and observe all other safety
(2) After removing an electrical assembly equipped with precautions.
ESD devices, place the assembly on a conductive
surface such as aluminum foil, to prevent elec- (8) Minimize bodily motions when handling
trostatic charge buildup or exposure of the assembly. unpackaged replacement ESD devices.
(Otherwise harmless motion such as the brushing
(3) Use only a grounded-tip soldering iron to solder or together of your clothes fabric or the lifting of your
unsolder ESD devices. foot from a carpeted floor can generate static
electricity sufficient to damage an ESD device).
(4) Use only an anti-static solder removal devices.
Some solder removal devices not classified as "anti-
static" can generate electrical charges sufficient to
damage ESD devices.
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