Input Voltage (V)

-50

-40

-30

-20

-10

0

10

20

30

40

50

-10

-20

-8

-16

-6

-12

-4

-8

-2

-4

0

0

2

4

4

8

6

12

8

16

10

20

Input Current

Output Voltage

25

INA821

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SBOS893A – AUGUST 2018 – REVISED DECEMBER 2018

Product Folder Links: INA821

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Copyright © 2018, Texas Instruments Incorporated

During an input overvoltage condition, current flows through the input protection diodes into the power supplies;

see Figure 62. If the power supplies are unable to sink current, then Zener diode clamps (ZD1 and ZD2 in

Figure 62) must be placed on the power supplies to provide a current pathway to ground. Figure 63 shows the

input current for input voltages from –40 V to 40 V when the INA821 is powered by ±15-V supplies.

Figure 63. Input Current vs Input Overvoltage

8.3.5 Operating Voltage

The INA821 operates over a power-supply range of 4.5 V to 36 V (±2.25 V to ±18 V).

CAUTION

Supply voltages higher than 40 V (±20 V) can permanently damage the device.

Parameters that vary over supply voltage or temperature are shown in the Typical

Characteristics section of this data sheet.