Technical information

ESDAxxSCx

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3

Technical information

3.1

ESD protection

The ESDA19SC6 is particularly optimized to perform ESD protection. ESD protection is

achieved by clamping the unwanted overvoltage. The clamping voltage is given by the

following formula :

As shown in Figure 11., the ESD strikes are clamped by the transient voltage suppressor.

Figure 11.

ESD clamping behavior (example)

To have a good approximation of the remaining voltages at both VI/O side, we provide the

typical dynamical resistance value Rd. By taking into account the following hypothesis :

R

we have:

Ω (IEC61000-4-2 standard),

Ω (typ.) give:

This confirms the very low remaining voltage across the device to be protected. It is also

important to note that in this approximation the parasitic inductance effect was not taken into

account. This could be a few tenths of volts during a few nanoseconds at the output side.

ESD Surge

Voutput

Rload

Rg

Rd

Vg

Device

to be

protected

ESDA19SC6

V

output

V

BR

R

d

+

V

g

R

g

-------

×

=