Overvoltage

Protection

IN

Input Transistor

+V

-V

+

±

Input Voltage

Source

ZD1

ZD2

21

INA821

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SBOS893 – AUGUST 2018

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8.3.4 Input Protection

The inputs of the INA821 device are individually protected for voltages up to ±40 V. For example, a condition of

–40 V on one input and 40 V on the other input does not cause damage. Internal circuitry on each input provides

low series impedance under normal signal conditions. If the input is overloaded, the protection circuitry limits the

input current to a value of approximately 8 mA.

Figure 58. Input Current Path During an Overvoltage Condition