# Logic Gates: The NOT Gate (Inverter)

Document Reference: TN201009001 - Rev: 4.14 - Last Update: 14-11-2020 02:38 GMT - Downloaded: 13-Apr-2024 01:49 GMT

## A NOT gate (aka inverter) is a logic gate with only one input and one output. The output state is always the opposite of the input state.

### NOT Gate (Inverter) Symbols

The input (`A`) of a NOT gate is on the left, and the output (`X`) is on the right of the logic NOT gate symbol.

Distinctive ShapeRectangular ShapeDIN Shape (Historic)

### NOT Gate Truth Table

#### Truth Table for NOT Gate

`A``X`
`0``1`
`1``0`

### NOT Gate Test-It

To test the gate, click the switch symbol in the image below.

### NOT Gate Logical Expressions

#### Word Equation

`X = NOT A`

#### Boolean Algebra

In boolean algebra the overbar sign (` `) stands for the NOT operation, e.g.:

`X = A`

Alternative notations:     `X = ∼A`     or     `X = ¬A`

`A``X = A`
`0``X = 1`
`1``X = 0`

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