Tektronix ECO 422, Instruction Manual

Page: 93 / 177

Maintenance
ECO 422
7–3
Table 7–1: Static-Sensitive Components
Semiconductor Classes Relative Susceptibility Levels
MOS or CMOS microcircuits or discrete or linear
microcircuits with MOS inputs (most sensitive) 100 to 500 V
EL, 74F, 74ALS, and 155- P/N parts 200 to 500 V
Schottky Signal Diodes 250 V
Schottky TTL 500 V
High-frequency Bipolar Transistors and ICs 400 to 600 V
JFETs 600 to 800 V
Low-frequency Linear Microcircuits 400 to 1000 V
Low-power Schottky TTL 900 V
TTL (least sensitive) 1200 V
NOTE
. Static discharges of less than 2 kV are seldom felt.
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 or on nonconductive surfaces.
3. Discharge the static voltage from your body by wearing a grounded wrist
strap while handling these components. Service static-sensitive components
or assemblies only at a static free workstation by qualified personnel. If
soldering is involved, use a soldering iron connected to earth ground and
special antistatic desoldering tools.
4. Avoid handling components in areas that have a floor or work surface
covering capable of generating a static charge. Carpeted floors should be
sprayed to reduce static problems. Also nothing capable of generating or
holding a static charge should be allowed on the workstation surface.
5. Keep the component leads shorted together whenever possible.
6. Pick up the components by the body, never the leads.
7. Do not slide the components over any surface.
8. Use a soldering iron that is connected to earth ground.
9. Use only special antistatic, suction, or wick-type desoldering tools.