Static-Sensitive Device Classification - Tektronix 11A52 Service Manual

Maintenance
Static-Sensitive Device Classification
CAUTION
Static discharge can damage any semiconductor component in this amplifier.
This amplifier contains electrical components that are susceptible to damage from static discharge. Table 3-1
gives relative susceptibility of various classes of semiconductors. Static voltages of 1 kV to 30 kV are common in
unprotected environments.
TABLE3-1
Relative Susceptibility to Damage from Static Discharge
Semiconductor Classes
MOS or CMOS microcircuits anddiscrete or linear
microcircuits with MOS in uts (most sensitive)
ECL
Linear Microcircuits
Low- ower Schott TTL
TTL (least sensitive)
lvoltage equivalent for levels
1=100to500V 6=600to800V
2 = 200 to 500 V 7 = 400 to 1000 V (est.)
3=250V 8=900V
4
=
500
v
9 = 1200
v
5=400to600V
Susce
1
2
3
5
6
7
8
9
(Voltage discharged from a 100 pF capacitor through a resistance of 100 ohms).
Observe the following precautions to avoid damage:
1. Minimize handling of static-sensitive components.
2. Transport and store static-sensitive components or assemblies in their original containers on a metal rail,
or conductive foam. Label any package that contains static-sensitive assemblies or components.
3. Discharge the static voltage from your body by wearing a wrist strap while handling these components
Servicing
static-s~nsitive
assemblies or components should be performed only at a static free work station
by qualified service personnel. We recommend use of the Static Control Mat, Tektronix part 006-3414-00,
and Wrist Strap, Tektronix part 006-3415-00.
4. Allow nothing capable of generating or holding a static charge on the work station surface.
5. Keep the component leads shorted together whenever possible.
6. Pick up components by the body, never by the leads.
3-4 11A52 Extended Service Manual
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