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Primer on Electro-Static Discharge Teledyne API Ultrafine Particle Monitor - Model 651
96 07506C DCN6727
large enough to damage a component can rebuild in just a few
seconds.
• Always store sensitive components and assemblies in anti-ESD
storage bags or bins: Even when you are not working on them,
store all devices and assemblies in a closed anti-Static bag or
bin. This will prevent induced charges from building up on the
device or assembly and nearby static fields from discharging
through it.
• Use metallic anti-ESD bags for storing and shipping ESD
sensitive components and assemblies rather than pink-poly
bags. The famous, “pink-poly” bags are made of a plastic that is
impregnated with a liquid (similar to liquid laundry detergent)
which very slowly sweats onto the surface of the plastic creating
a slightly conductive layer over the surface of the bag.
While this layer may equalizes any charges that occur
across the whole bag, it does not prevent the build up of
static charges. If laying on a conductive, grounded
surface, these bags will allow charges to bleed away but
the very charges that build up on the surface of the bag
itself can be transferred through the bag by induction
onto the circuits of your ESD sensitive device. Also, the
liquid impregnating the plastic is eventually used up
after which the bag is as useless for preventing damage
from ESD as any ordinary plastic bag.
Anti-Static bags made of plastic impregnated with metal
(usually silvery in color) provide all of the charge
equalizing abilities of the pink-poly bags but also, when
properly sealed, create a Faraday cage that completely
isolates the contents from discharges and the inductive
transfer of static charges.
Storage bins made of plastic impregnated with carbon
(usually black in color) are also excellent at dissipating
static charges and isolating their contents from field
effects and discharges.
• Never use ordinary plastic adhesive tape near an ESD sensitive
device or to close an anti-ESD bag. The act of pulling a piece of
standard plastic adhesive tape, such as Scotch® tape, from its
roll will generate a static charge of several thousand or even tens
of thousands of volts on the tape itself and an associated field
effect that can discharge through or be induced upon items up to
a foot away.