The Multiple-Value Logic (MVL) circuit significantly enhances propagation delay and energy consumption compared to the binary circuit. Additionally, the Carbon Nanotube Field-Effect Transistor (CNTFET) demonstrates enhancements in energy efficiency and circuit speed when compared to other transistor technologies. Therefore, this paper proposes two different designs of Ternary Decoders (TDecoders) using CNTFET, which can create additional ternary circuits such as ternary adders, multipliers, and multiplexers. The investigation and proposed TDecoders were simulated and tested with the HSpice simulator. The simulation results demonstrate the approach’s merits in reducing energy consumption by over 65% and 10% compared to the standard design and the best-case design, respectively.