Tektronix TDS 420A, Service Manual, Page: 155 / 288

Maintenance
TDS 420A, TDS 430A & TDS 460A Service Manual
6- 3
Table 6--1 lists the relative susceptibility of various classes of semiconductors.
Static voltages of 1 kV to 30 kV are common in unprotected environments.
Table 6- 1: Relative Susceptibility to Static-Discharge Damage
Semiconductor Classes
Relative Susceptibility
Levels
1
MOS or CMOS microcircuits or discrete circuits, or linear
microcircuits with MOS inputs (most sensitive) 1
ECL 2
Schottky signal diodes 3
Schottky TTL 4
High-frequency bipolar transistors 5
JFET 6
Linear microcircuits 7
Low-power Schottky TTL 8
TTL (least sensitive) 9
1
Voltage equivalent for levels (voltage discharged from a 100 pF capacitor through
resistance of 100 ohms
)
:
1 = 100 to 500 V 6 = 600 to 800 V
2 = 200 to 500 V 7 = 400 to 1000 V (est.)
3 = 250 V 8 = 900 V
4 = 500 V 9 = 1200 V
5 = 400 to 600 V
Susceptibility to ESD