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OpAmp selection table: rail-to-rail option misunderstanding

Category: Hardware


In the selection table for OpAmps for there are 3 values for "rail-to-rail" option:

  • Both
  • In to V-
  • Output

While the first two is quite comprehensive ("true rail-to-rail" and "negative-only-rail" consequently), the 3rd I didn't understand.

What "Output" rail-to-rail mean exactly ?


Top Replies

    •  Analog Employees 
    Oct 24, 2022 in reply to Pavel47 +1 verified

    Hello ,

    Rail-to-rail is a term used to describe an OpAmp that is capable of swinging near its supply voltages. This can refer to either the output or both the input and output of an OpAmp.