Overvoltage Protection Controllers with

Status FLAG

8

_______________________________________________________________________________________

Human Body Model

shows the current waveform it generates when dis-

charged into a low impedance. This model consists of

a 100pF capacitor charged to the ESD voltage of inter-

est, which is then discharged into the device through a

1.5k

Ω resistor.

IEC 1000-4-2

Since January 1996, all equipment manufactured and/or

sold in the European community has been required to

meet the stringent IEC 1000-4-2 specification. The IEC

1000-4-2 standard covers ESD testing and performance

of finished equipment; it does not specifically refer to

integrated circuits. The MAX4838–MAX4841 help users

design equipment that meets Level 3 of IEC 1000-4-2,

without additional ESD-protection components.

The main difference between tests done using the

Human Body Model and IEC 1000-4-2 is higher peak

current in IEC 1000-4-2. Because series resistance is

the ESD-withstand voltage measured to this standard is

generally lower than that measured using the Human

the ±8kV IEC 1000-4-2 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

Si9936DY

Dual/SO8

30

80

Si5904DC

Dual/1206-8

30

143

Si1426DH

Single/SC70-6

30

115

Vishay Siliconix

www.vishay.com

402-563-6866

FDC6305N

Dual/SSOT-6

20

80

FDS8926A

Dual/SO8

30

20

FDG315N

Single/SC70-6

30

160

Fairchild Semiconductor

www.fairchildsemi.com

207-775-8100

IRF7752

Dual/TSSOP-8

30

36

IRF7303

Dual/SO8

30

80

IRF7607

Single/Micro-8

20

30

International Rectifier

www.irf.com

310-322-3331