Cu0.3Ni0.66Mn2.04O4 negative temperature coefficient (NTC) ceramic was prepared using mixed oxalate-derived oxide powder. The mixed oxalate was synthesized by milling a mixture of copper acetate, nickel acetate, manganese acetate and oxalic acid at room temperature. The spinel-structured oxide powder was obtained by calcining the mixed oxalate in air at 800°C for 2h. The oxide powder compact was sintered at a relatively low temperature of 1100°C for 2.5h, attaining a relative density of ∼98%. The sintered ceramic had a specific resistivity ρ25°C of 63.3Ωcm and the thermal constant B25/50 of 2740K, and exhibited much reduced shift in electrical resistivity of ∼5% after annealing at 150°C for 500h in air. The difference in the electrical property of the as-prepared ceramic is attributed to the fine-grained microstructure and the lower sintering temperature used in the present study.