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OPA4171 input diode clamping

John Gray
Intellectual 310 points

Other Parts Discussed in Thread: OPA4171

A question about the OPA4171 and whether it has input diode clamping.  I looked at the specifications and notice that the inputs are specified from rail to rail (or at least near them).  But on page 16 of the specification in the functional diagram it shows input diode clamping.  No differential input max is specified anywhere in the data sheet that I can find.

The question, does the OPA4171 have input diode clamping?    If so what is the max differential input voltage it can stand and what is the max current through the diodes?

 

Thanks,

-John

  • 0
    TI__Guru 72891 points

    John,

    OPA4171 does have back-to-back input protection diodes between its input terminals as shown on page 16 of the datasheet.  Since any potential damage to the input stage would be caused by excessive current and forward-bias of the diodes is a function of temperature (Vbe changes at -2mV/C), we do not specify the maximum differential voltage but instead show maximum input terminal current (+/-10mA) as shown in the Absolute Maximum Ratings table below:

  • 0 in reply to Marek Lis
    Intellectual 310 points

    Thanks Marek.  I have been use to looking for the differential max voltage as a parameter that indicates the diodes during mass op amp searches.  I guess I'll have to look at the function diagram a little harder.  Have a good day!

    -John

  • 0 in reply to John Gray
    TI__Guru 72891 points
    No problem. Glad I could help.

    Best,
    Marek