Overvoltage-Protection Controllers with

Status

FLAG

8

_______________________________________________________________________________________

IEC 61000-4-2

Since January 1996, all equipment manufactured and/or

sold in the European community has been required to

meet the stringent IEC 61000-4-2 specification. The IEC

61000-4-2 standard covers ESD testing and perfor-

mance of finished equipment; it does not specifically

refer to integrated circuits. The MAX4838A/MAX4840A/

MAX4842A help users design equipment that meets

Level 3 of IEC 61000-4-2, without additional ESD-protec-

tion components.

The main difference between tests done using the

Human Body Model and IEC 61000-4-2 is higher peak

current in IEC 61000-4-2. Because series resistance is

lower in the IEC 61000-4-2 ESD test model (Figure 10),

the ESD-withstand voltage measured to this standard is

generally lower than that measured using the Human

Body Model. Figure 11 shows the current waveform for

the ±8kV IEC 61000-4-2 Level 4 ESD Contact

Discharge test. The Air-Gap test involves approaching

the device with a charger probe. The Contact

Discharge method connects the probe to the device

before the probe is energized.

CHARGE-CURRENT-

LIMIT RESISTOR

DISCHARGE

RESISTANCE

STORAGE

CAPACITOR

Cs

100pF

1M

Ω

1.5k

Ω

HIGH-

VOLTAGE

DC

SOURCE

DEVICE

UNDER

TEST

Figure 8. Human Body ESD Test Model

90%

36.8%

TIME

CURRENT WAVEFORM

PEAK-TO-PEAK RINGING

(NOT DRAWN TO SCALE)

Ir

10%

0

0

AMPERES

Figure 9. Human Body Model Current Waveform

PART

CONFIGURATION/

PACKAGE

(m

Ω)

MANUFACTURER

Si5902DC

Dual/1206-8

30

143

Si1426DH

Single/SC70-6

30

115

Vishay Silconix

www.vishay.com

402-563-6866

FDC6305N

Dual/SSOT-6

20

80

FDC6561AN

Dual/ SSOT-6

30

145

FDG315N

Single/SC70-6

30

160

Fairchild Semiconductor

www.fairchildsemi.com

207-775-8100

Table 1. MOSFET Suggestions