LM35 Precision Temperature Sensor

The LM35 series are precision integrated-circuit temperature sensors, with an output voltage linearly proportional to the Centigrade temperature. Thus the LM35 has an advantage over linear temperature sensors calibrated in ° Kelvin, as the user is not required to subtract a large constant voltage from the output to obtain convenient Centigrade scaling. The LM35 does not require any external calibration or trimming. Low cost is assured by trimming and calibration at the wafer level. The low output impedance, linear output, and precise inherent calibration of the LM35 make interfacing to readout or control circuitry especially easy. The device is used with single power supplies, or with plus and minus supplies. As the LM35 draws only 60 μA from the supply, it has very low self-heating of less than 0.1°C in still air. The LM35 is rated to operate over a 0°C to +100°C temperature range.

Features:
– Calibrated Directly in ° Celsius (Centigrade)
– Linear + 10 mV/°C Scale Factor
– 0.5°C Ensured Accuracy (at +25°C)
– Suitable for Remote Applications
– Low Cost Due to Wafer-Level Trimming
– Operates from 4 to 30 V
– Less than 60-μA Current Drain
– Low Self-Heating, 0.08°C in Still Air
– Nonlinearity Only ±¼°C Typical
– Low Impedance Output, 0.1 Ω for 1 mA Load