OP2177 protection diode

Hello

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.

Regards,

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  • 0
    •  Analog Employees 
    on Nov 27, 2017 4:34 PM over 3 years ago

    Hi Terumasa, 

    There are no input clamping diodes on the OP2177. If inputs go beyond the supplies, it is recommended that the current be limited to 5mA. Please see the Input Overvoltage Protection section on the datasheet.

    Also, what design stage are you in and what is your application. I would also suggest you look at the ADA4177-2 if it fits your requirement. It has integrated overvoltage protection, higher bandwidth, lower noise, and low bias current. 

    Thanks, 
    Kris

  • Hello Kris,

    Into section input overvoltage protection it is written :

    The OPx177 has internal protective circuitry that allows voltages as high as 2.5 V beyond the supplies to be applied at the input of either terminal without any harmful effects.

    What kind of protection is used ?

    Do you have an internal schematic to share with us ?

    I am loonking for internal path from IN to VS.

    There is a PCN 18_0060.

    Does it impact the protection circuitry?

    Best regards,

    Areski

Reply
  • Hello Kris,

    Into section input overvoltage protection it is written :

    The OPx177 has internal protective circuitry that allows voltages as high as 2.5 V beyond the supplies to be applied at the input of either terminal without any harmful effects.

    What kind of protection is used ?

    Do you have an internal schematic to share with us ?

    I am loonking for internal path from IN to VS.

    There is a PCN 18_0060.

    Does it impact the protection circuitry?

    Best regards,

    Areski

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