Precautions
1-3 ESD Precautions
Electrostatically Sensitive Devices (ESD)(7) Immediately before removing the protective ma-
terials from the leads of a replacement ESD device,
Some semiconductor (solid state) devices can be dam-touch the protective material to the chassis or cir-
aged easily by static electricity.cuit assembly into which the device will be
Such components commonly are called Electrostati-installed.
cally Sensitive Devices(ESD). Examples of typical ESD
devices are integrated circuits and some field-effectCAUTION : Be sure no power is applied to the ch-
transistors and semiconductor chip components. Theassis or circuit, and observe all other safety precau-
following techniques should be used to help reducetions.
the incidence of component damage caused by static
electricity.(8) Minimize bodily motions when handling unpack-
aged replacement ESD devices. (Otherwise harm-
(1) Immediately before handling any semiconductorless motion such as the brushing together of your
component or semiconductor-equipped assembly,clothes fabric or the lifting of your foot from a car-
drain off any electrostatic charge on your body bypeted floor can generate static electricity sufficient
touching a known earth ground. Alternatively,to damage an ESD device).
obtain and wear a commercially available dis-
charging wrist strap device, which should be
removed for potential shock reasons prior to apply-
ing power to the unit under test.
(2) After removing an electrical assembly equipped
with ESD devices, place the assembly on a conduc-
tive surface such as aluminum foil, to prevent elec-
trostatic charge buildup or exposure of the assem-
bly.
(3) Use only a grounded-tip soldering iron to solder or
unsolder ESD devices.
(4) Use only an anti-static solder removal devices.
Some solder removal devices not classified as
?anti-static? can generate electrical charges suffi-
cient to damage ESD devices.
(5) Do not use freon-propelled chemicals. These can
generate electrical charges sufficient to damage
ESD devices.
(6) Do not remove a replacement ESD device from its
protective package until immediately before your
are ready to install it.(Most replacement ESD
devices are packaged with leads electrically short-
ed together by conductive foam, aluminum foil or
comparable conductive materials).
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