Half Subtractor in Digital Electronics

Half Subtractor is a combinational circuit that performs subtraction of two bits and has two inputs and two outputs. The two inputs denoted by A and B represents minuend and subtrahend. The two outputs are the difference “D” and the borrow bit “Bo“.

Truth Table of a half subtractor circuit can be derived as follows:

A

B

D

Bo

0

0

0

0

0

1

1

1

1

0

1

0

1

1

0

0

From the truth table, Boolean Expression can be derived as:

D = A’B + AB’ =  A B

Bo = A’B

A Half Subtractor circuit can be implemented using AND & OR logic gates or by using XOR, NOT & AND logic gates. Both these implementations are shown in the image below:

Half Subtractor Implementation Using Logic GatesHope you find the information presented here useful. Please leave your footprints in the comments section below for any queries, suggestions or feedback.

  1. there are no related videos on youtube of ” building ” half adder and full adder circuit on breadboard…….. :)

  2. Hey Dua,

    That’s a good suggestion to introduce some videos on creating circuits using breadboard. Let us see what can we do about it.

    Thanks

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