The LM35 series analog temperature sensors have an output voltage linearly proportional to the Celsius temperature. The LM35DZ senses temperatures between 0°C and 100°C, and does not require any external calibration or trimming to provide a typical accuracy of ±0.6°C (at room temperature). Its low output impedance, linear output and precise inherent calibration make for an easy interface to readout or control circuitry. It operates on 4V to 30V and draws no more than 60µA.
See also the LM34DZ, which is calibrated for Fahrenheit, but requires at least 5V and may draw more current.
Download LM35 Series Datasheet