OP2177 protection diode


We will use OP2177.

In absolute maximum rate of the datasheet, input range is -Vs ~+Vs.

The datasheet of opamp usually include  the description of  power supply +- 0.3V at input

Does OP2177 include  a protection diode at input stage ?

If not so, we will add external diode.

Please let me know your advice.


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  • Hi Kirill,

    There is a PCN 18_0060.

    Is it possible to have more details regarding circuitry modification ?

    PCN -> This includes the transistor layout, rerouting of circuitry


  • Hi Areski,

    My initial assumption was that this amplifier belongs to the OP07 family. And we should expect similar input protection circuitry. But you can't say anything unambiguous, because there is no uniformity in the data sheets. I believe that OPX177 uses back-to-back diodes and two resistors in series with inputs, as in OP07/ 77/177.

    But the specification for the absolute maximum differential input voltage depends on the supply voltage, which is not typical for older OP07 family amplifiers. This means that the protection circuit has changed, and only ADI specialists can say something specific

    By the way, why are you interested in the internal protection circuit?