If there is an uncertainty about the ability of the supply to absorb this current, external Zener diodes may be

added to the supply pins as shown in Figure 7-3. The Zener voltage must be selected so that the diode does not

turn on during normal operation. However, the Zener voltage must be low enough so that the Zener diode

conducts if the supply pin begins to rise above the safe operating supply voltage level.

R

F

Op Amp

Core

R

I

R

L

V

(1)

IN

I

D

-In

Out

+In

ESD Current-

Steering Diodes

Edge-Triggered ESD

Absorption Circuit

+V

S

+V

-V

-V

S

R

S

(3)

TVS

(2)

TVS

(2)

(3) Suggested value approximately 1 kΩ.

Figure 7-3. Equivalent Internal ESD Circuitry Relative to a Typical Circuit Application

OPA145,, OPA2145

SBOS427E – JUNE 2017 – REVISED OCTOBER 2020

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