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3 ESD PRECAUTIONS
Electrostatically Sensitive Devices (ESD)
Some semiconductor (solid state) devices can be damaged easily by
static electricity.
Such components commonly are called Electrostatically Sensitive
Devices (ESD). Examples of typical ESD devices are integrated circuits
and some field-effect transistors and semiconductor chip components.
The following techniques should be used to help reduce the incidence
of component damage caused by static electricity.
static electricity.
Such components commonly are called Electrostatically Sensitive
Devices (ESD). Examples of typical ESD devices are integrated circuits
and some field-effect transistors and semiconductor chip components.
The following techniques should be used to help reduce the incidence
of component damage caused by static electricity.
(1) Immediately before handling any semiconductor component or
semiconductor-equipped assembly, drain off any electrostatic
charge on your body by touching a known earth ground.
Alternatively, obtain and wear a commercially available
discharging wrist strap device, which should be removed for
potential shock reasons prior to applying power to the unit under
test.
charge on your body by touching a known earth ground.
Alternatively, obtain and wear a commercially available
discharging wrist strap device, which should be removed for
potential shock reasons prior to applying power to the unit under
test.
(2) After removing an electrical assembly equipped with ESD devices,
place the assembly on a conductive surface such as aluminum foil,
to prevent electrostatic charge buildup or exposure of the assembly.
to prevent electrostatic charge buildup or exposure of the assembly.
(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 sufficient to damage ESD devices.
electrical charges sufficient 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
shorted together by conductive foam, aluminum foil or comparable
conductive materials).
replacement ESD devices are packaged with leads electrically
shorted together by conductive foam, aluminum foil or comparable
conductive materials).
(7) Immediately before removing the protective materials from the
leads of a replacement ESD device, touch the protective material
to the chassis or circuit assembly into which the device will be
installed.
to the chassis or circuit assembly into which the device will be
installed.
CAUTION:
Be sure no power is applied to the chassis or circuit, and
observe all other safety precautions.
(8) Minimize bodily motions when handling unpackaged replacement
ESD devices. (Otherwise harmless motion such as the brushing
together of your clothes fabric or the lifting of your foot from a
carpeted floor can generate static electricity sufficient to damage
an ESD device).
together of your clothes fabric or the lifting of your foot from a
carpeted floor can generate static electricity sufficient to damage
an ESD device).
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