Op amp input voltage

[miketan3904]

Hi. I would like to know if we can apply a voltage higher/ lower than the supply of the op amp to the input of the op amp. For example, if I am powering up the op-amp with a single supply, can i apply a -3V at its input?

[TimFox]

The input common-mode range is one of the specifications on the op amp data sheet, and varies substantially from part to part.
Most op amps will not tolerate a common-mode input voltage 3 V negative with respect to the negative power terminal.

[David Hess]

Common mode range is separate from the absolute maximum input range.

Most operational amplifiers will not tolerate input voltages which are higher or lower than the supply voltages however there are some exceptions with parts specifically designed to support higher or lower or both input voltages.

Also beware that not all operational amplifiers will tolerate a large difference in voltage between the inputs.

[TimFox]

Right.  Common-mode range is for proper operation, but exceeding the absolute maximum input can irreversibly damage the part.  Both are specified on the data sheet.