OPA145 Datasheet, PDF (23/40 Pages) Texas Instruments – High-Precision, Low-Noise, Rail-to-Rail Output, 5.5-MHz JFET Operational Amplifiers

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OPA145, OPA2145, OPA4145
SBOS427 – JUNE 2017
Feature Description (continued)
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 41. The Zener voltage must be selected such that the diode does
not turn on during normal operation.
However, its 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.
(2)
TVS
R_F
+V_S
+V
I_D
V_IN(1)
R_I
-In
(3)
R_S
+In
Op Amp
Core
-V
ESD Current-
Steering Diodes
Out
Edge-Triggered ESD
Absorption Circuit
R_L
-V_S
(2)
TVS
(1) V_IN = +V_S + 500 mV.
(2) TVS: +V_S(max) > V_{TVSBR (Min)} > +V_S
(3) Suggested value approximately 1 kΩ.
Figure 41. Equivalent Internal ESD Circuitry and Its Relation to a Typical Circuit Application
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