The present invention relates to a QCA BCD-3 code converter. The QCA BCD-3 code converter according to the present invention is connected to first to fourth wirings and second to fourth wirings to which the first to fourth input signals are respectively inputted, A second combinational logic cell connected to the output cell of the first combinational logic cell and performing a logical sum gate function to output a first output signal, and a third combinational logic cell connected to the third and fourth wirings, A third combinational logic cell performing a gate function, a fourth combinational logic cell coupled to an output cell of the second and third combinational logic cells for performing an exclusive OR gate function to output a second output signal, A fifth combinational logic cell connected to the fourth wiring and performing an exclusive OR gate function and a sixth combinational logic circuit connected to an output cell of the fifth combinational logic cell to perform a logic negation function to output a third output signal, Cell, and the fourth wire. And performs the logical negation function, including a seventh gate combination logic cell that outputs a fourth output signal. According to the present invention, it is possible to provide a BCD-3 code converter having an expandable structure using a quantum dot cellular automata.
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