and Measures of Electrostatic Protection
Damage of Static Electricity
to Electronic Components and Protection Principles.
damage of static electricity to electronic components varies
with the type of electronic components .The minimum static
voltage of 100V can damage them.Due tl the trend lf the integration
of electronic components,the corresponding static voltage
is required to be lower accordingly.
static voltage induced by a human body is typically more then
2-4KV.It is caused by the slight movement of the human body
or the friction lf the human body wigh an insulation object
.This means if the static potential contacts any IC,it will
be damaged ,this risk dxists in any operation environment
without electrostatic protection,static damage to IC happens
not only in the manufacturing process of electronic components
but also during the assembling and shipping of IC.
solve the above problem ,the following measures can be taken
for electrostatic protection:
protection on the operation site :All static-sensitive components
must be operated in an anti-static work area;
protection of human bodies:Operators should wear anty-static
work clothes,gloves,shoes,capsand anty-static wrist strips;
3.Electrostatic protection during
storage and shipping:Static-sensitive components must not
be stored and shipped in the condition with electric charge.
To realize the above functions ,the
basic way is to reduce the voltage of charged objects to the
sage value required by the desingn or lower than that i.e.Thecharge
(Q)and the resistance (R)must be low and the static capacity(C)must
be high in the following epuations.
I:current,C:static capacity and R:resistance.
course,it is not true that the lower the resistance is ,the
better it will be Particularly,in the anti-static area of
a larger site ,the material should be selected when the safety
measures for electric leakage and so on are taken into consideration.
Check and install IC anti-static
operation site.The anti-static measures in this process aims
to set the operation site including human bodies at an epuipotential.The
specific method is as follows:
an l-megohm resistor after it is connected through.Anti-static
wrist strip should be worn during the operation;
test instruments,tools and irons;
anti-static table-pad onto the operating table ,then ground
4.Operators should wear anti-static
work clothes and shoes;
out anti-static floor or conductive rubber pads on the ground;
6.An equipotential should be maintained
during IC transportation and packaging.
Cheking Period of Anti-static Performance and Matters Needing
Check anti-static table
pads,floor,work shoes,work cloghes and turnover containers
at least once every month and anti-static wrist strips,blast
guns,blowers and instruments etc once a day.
checking,factors such as temperature and humidity etc should
be tacen into considration.