The LM135, LM235, and LM335 are precision temperature sensors that produce an output voltage directly proportional to temperature with a slope of 10mV/°C. They operate with a supply current between 450μA to 5mA and have a dynamic impedance of less than 1 ohm. When calibrated at 25°C, they can measure temperature with an accuracy of less than 1°C over a range of 100°C.