Document Reference: TN201009001 - Rev: 4.14 - Last Update: 14-11-2020 02:38 GMT - Downloaded: 30-Sep-2022 07:30 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 Shape | Rectangular Shape | DIN 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` |