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Means of Static
Generation
Walking across carpet
Walking over vinyl floor
Worker at bench
Vinyl envelopes for work instructions
Poly bag picked up from bench
Work chair padded with poly foam
2.
General Rules
(1)
ESD-sensitive components shall only be removed from their static-shielding
bags by a person who is properly grounded.
(2)
When taken out of their static-shielding bags, ESD-sensitive components shall
never be placed over, or on, a surface which has not been properly grounded.
(3)
ESD-sensitive components shall be handled in such a way that the body does
not come in contact with the conductor paths and board components. Handle
ESD-sensitive components in such a way that they will not suffer damage from
physical abuse or from electric shock.
(4)
EPROMS/PROMS shall be kept in anti-static tubes until they are ready to use
and shall be removed only by a person who is properly grounded.
(5)
When inserting and removing EPROMS/PROMS from PC boards, use a chip
removal tool similar to the one shown in the figure following. Remember, all work
should be performed on a properly grounded surface by a properly-grounded
person.
Table 1
Typical Electrostatic Voltages
10-20 Percent
Relative Humidity
35,000
12,000
6,000
7,000
20,000
18,000
Electrostatic Voltages
65-90 Percent
Relative Humidity
1,500
250
100
600
1,200
1,500
ESDS Manual
S14006
4/15/92
3
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