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Electrostatic
Discharge
Information
A
sudden
discharge
of
static
electricity
from
your
finger
or
other
conductor
can
destroy
static-sensitive
devices
or
microcircuitry.
Often
the
spark
is
neither
felt
nor
heard,
but
damage
occurs.
An
electronic
device
exposed
to
electrostatic
discharge
(ESD)
may
not
appear
to
be
affected
at
all
and
can
work
perfectly
throughout
a
normal
cycle.
The
device
may
function
normally
for
a
while,
but
it
has
been
degraded
in
the
internal
layers,
reducing
its
life
expectancy.
Networks
built
into
many
integrated
circuits
provide
some
protection,
but
in
many
cases,
the
discharge
contains
enough
power
to
alter
device
parameters
or
melt
silicon
junctions.
Generating
Static
The
following
table
shows
that:
●
Different
activities
generate
different
amounts
of
static
electricity.
●
Static
electricity
increases
as
humidity
decreases.
Relative
Humidity
Event
55%
40%
10%
Walking
across
carpet
Walking
across
vinyl
floor
Motions
of
bench
worker
Removing
DIPs*
from
plastic
tube
Removing
DIPs*
from
vinyl
tray
Removing
DIPs*
from
Styrofoam
Removing
bubble
pack
from
PCB
Packing
PCBs
in
foam-lined
box
7,500
V
3,000
V
400
V
400
V
2,000
V
3,500
V
7,000
V
5,000
V
15,000
V
5,000
V
800
V
700
V
4,000
V
5,000
V
20,000
V
11,000
V
35,000
V
12,000
V
6,000
V
2,000
V
11,500
V
14,500
V
26,500
V
21,000
V
*These
are
then
multi-packaged
inside
plastic
tubes,
trays,
or
Styrofoam.
NOTE:
700
volts
can
degrade
a
product.
Preventing
Electrostatic
Damage
to
Equipment
Many
electronic
components
are
sensitive
to
ESD.
Circuitry
design
and
structure
determine
the
degree
of
sensitivity.
The
following
packaging
and
grounding
precautions
are
necessary
to
prevent
damage
to
electric
components
and
accessories.
●
To
avoid
hand
contact,
transport
products
in
static-safe
containers
such
as
tubes,
bags,
or
boxes.
●
Protect
all
electrostatic
parts
and
assemblies
with
conductive
or
approved
containers
or
packaging.
●
Keep
electrostatic
sensitive
parts
in
their
containers
until
they
arrive
at
static-free
stations.
15