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LM358: Need review - Will the rail to rail be a problem? LM358D

Shyam Thillainathan
Prodigy 150 points
Part Number: LM358

Hi,

Below is my design:

Datasheet says common mode voltage input is V+-2, in that case if my input is 3.3V, what happens?

  • 0
    TI__Prodigy 190 points

    Hi Shyam,

    Thank you for reaching out through E2E!

    The LM358 is not a rail-to-rail device. In your design, since your V+ = 3.3V, then your input common mode voltage max would have to be less than 1.3V (V+ - 2). If you exceed the common mode voltage ranges then your op amp will not behave properly, and the output becomes non-linear. If you would like to learn more about input and output limitations, we have a great content in our TI Precision Labs courses.

    TI Precision Labs - Op amps: Input and output limitations

    Best Regards,

    Pradeep Jacob