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: In this paper, investigate and analysis various techniques for implementing a half adder circuit with the fewest transistors possible. In digital electronics half adder combinational circuit used to add two numbers. It is an arithmetic circuit that performs the arithmetic operation of adding two single-bit words. The half adder technique, design of half adder using AVL technology, Design of a 3-T Half Adder, NMOS pass transistors logic design of half adder using 2:1 MUX, half adder circuit design with CMOS NAND gates, half adder circuit design with CMOS transmission logic gates in cadence virtuoso. In this section, compare half adder circuit design techniques and compare various parameters of half adder circuit design used various circuit design techniques. Conventional techniques required fewer number routing resources. A 3-T halfadder circuit performs with less delay, high speed, small layout area, less power consumption and batter efficiency and accuracy