Sony CDP-101 - Integrated Circuit (IC) Handling; MOS IC Handling Precautions; MOS IC Replacement Precautions

Hoe a Sat oie iat a,
CDP-101
Handling Precautions for MOS ICs
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Generally, the insulation resistance of the oxide
layer in MOS IC structures is very high, and the oxide
layer is very thin. Because of this, it is possible that
the static voltages usually present on clothes and the
human body will be enough to generate a potential
difference across the insulator, high enough to cause
a breakdown of the insulating layer.
The following precautions should be taken while
handling these ICs.
(Particular care should be taken under conditions
of low humidity.)
Precautions in Replacing MOS !Cs
1. Store new ICs by inserting them into a urethane-
polyester cushion (which is somewhat conduc-
3. Equalize any potential difference between the
clothes, the tools in use, the work bench, the
set being worked on, and the packaged IC by
touching them all in succession with the hands
or a conductive wire or tool.
4. The following are effective methods for handl-
ing ICs that remove the potential difference
across the oxide layer.
® Use a paper clip modified by soldering in a
wire braid insert.
wire braid
clip
A
tive), or wrapping it in aluminum foil, so that = ‘
all
the
pins
are
at
the
same.
potential.
soldered
=
‘
soldered
—— 3
(The ICs should be stored in that manner until Y SSS
4
mounted on the circuit board.)
Fig. A partially conductive
unrethane-polyester
cushion
IC
Fig. B
aluminum foil
2. Check the soldering iron for possible power-line
leakage current. Make sure that there is no
5 Make sure that there is
Fig. D no solder on the inside.
clip
partially conductive
leakage path by connecting an ohmmeter to the Fi urethane-polyester
tip of the soldering iron and the plug as shown 9. E eee pe aluminen
in Fig. C. If there is a leakage path, use some
other soldering iron.
VOM
(2 x 10,000 range)
wire braid
y
NOOO EEK VE KY EEE KS
mt
clip
(AEE EEE EE OE XAT JSD
Make sure that all the pins are in
contact with the wire braid (all
: the pins will then be at the same
Fig. F _ potential.).