The LM35 Precision Centigrade Temperature Sensor IC is a 3-pin analog sensor housed in a TO-92 package that outputs a voltage linearly proportional to the temperature in Celsius. Unlike thermistor-based sensors, it needs no external calibration or lookup tables to get an accurate reading.
Key features:
- Linear Analog Output: Produces 10mV per degree Celsius, so the reading converts to temperature with simple math on any microcontroller’s ADC.
- Factory Calibrated: Calibrated directly in degrees Celsius, eliminating the need for external calibration or trimming.
- Wide Sensing Range: Measures temperatures from 0°C to +100°C (LM35DZ variant).
- Low Self-Heating: Draws under 60µA of supply current, keeping self-heating below 0.1°C in still air.
- Wide Supply Range: Operates from a single 4V to 30V supply, compatible with most microcontroller boards.
- Simple 3-Pin Package: TO-92 package with VCC, VOUT, and GND pins for easy breadboard or perfboard mounting.
It’s a straightforward, low-cost option for temperature monitoring, incubators, and weather stations where fast analog readings matter more than the extended range of a digital sensor.
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