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This work presents a CMOS temperature sensor based on thermal diffusivity sensing. This sensor is insensitive to leakage currents, and so can reliably operate up to and beyond 150ºC. Also, thermal diffusivity sensors have low intrinsic spread, which means that in many applications, they do not require trimming. A thermal diffusivity sensor and its interface circuit were realized in 0.7µm CMOS technology. The untrimmed device-to-device spread corresponds to a temperature error of ±0.7ºC (3σ) from -70ºC to 160ºC. This operating range is a significant improvement on the state-ofthe-art.