ST3237EB

Application note

11/18

The second model is IEC 1000-4-2 and is used to simulate the reaction of the device on

equipment when subjected to electrostatic discharges, which may occur from personnel to

objects near vital instrumentation. Direct (Contact) and indirect (Air Gap) applications of

discharges to the equipment under test (EUT) are possible. Test characteristics are shown

in circuit, waveform and table below.

Figure 9.

IEC 1000-4-2 circuit

Figure 10.

IEC 1000-4-2 current waveform

Table 11.

Characteristics of the ESD generator

Level

Indicated

voltage

First peak current

of discharge (±

10%)

Rise time with discharge

switch

Current at 30 ns

(± 30%)

Current at 60 ns

(± 30%)

1

2 kV

7.5 A

0.7 to 1ns

4 A

2 A

2

4 kV

15 A

0.7 to 1ns

8 A

4 A

3

6 kV

22.5 A

0.7 to 1ns

12 A

6 A

4

8 kV

30 A

0.7 to 1ns

16 A

8 A