## Difference Between Half adder and Full adder

Contents

### Difference Between Half adder and Full adder in Tabular Form

The Key **Difference Between Half adder and Full adder** is that **Half adder** has two inputs and **Full adder** has three inputs. Half adder is a combinational logic circuit.

### Comparison Chart

Half adder | Full adder |
---|---|

It is used for 2-bit addition. | It is used for 3-bit addition. |

One Ex-OR gate and one AND gate are used. | One Ex-OR gate, three AND gates, and one OR gate are used. |

Output is the sum of two signals. | Output is the sum of three signals. |

Half adder circuit is simple. | Full adder circuit is complicated. |

There are two input and two output terminals. | There are three input terminals and two output terminals. |

It cannot be used as a full adder. | It can be used as a half adder. |

Example: Calculators, computers, digital measuring devices, etc. | Example: Multiple bit addition, digital processors, etc. |

### Half adder

- A Half adder has two binary bits.
- Block Diagram of Half adder.
- Half adder is two input terminals, which are marked as
**A**and**B**. - Half adder is two output terminal.
- One terminal is for sum bit
**S**and the other is the carry bit**C.**

### Full adder

- A half adder can add two bits.
- In addition of the second-bit carry signal from the first bit has to be added. So, half adder cannot be used. For this, a full adder circuit is used.

- In this, there are three input terminals. One input is
**Cin,**which is carried from the previous stage.**A & B**are the two input terminals. - There are two output terminals. One is the final sum
**S**and the other is the final carry**C.**