The LM35DZ is an industry-standard, high-precision integrated-circuit temperature sensor whose output voltage is linearly proportional to the Celsius (Centigrade) temperature. Unlike thermistors that require complex logarithmic calculations in your code, the LM35DZ is factory-calibrated directly in Celsius, making it incredibly easy to interface with microcontrollers like Arduino, Raspberry Pi, and ESP32.

With a linear scale factor of +10.0 mV/C, reading the temperature is as simple as measuring the analog voltage output. Whether you are building a DIY weather station, a home automation thermostat, or a cooling fan controller, the LM35DZ delivers reliable accuracy without the hassle of external calibration.

Key Features & Benefits

• Directly Calibrated in Celsius: No complex math required with a linear +10.0 mV/C scale factor.

• Highly Accurate: Rated for 0.6C accuracy at room temperature.

• Wide Operating Range: Suitable for measuring temperatures from 0C to +100C.

• Low Self-Heating: Draws less than 60 microamps from its power supply, ensuring extremely low self-heating.

• Compact TO-92 Package: Easy to breadboard, solder onto prototyping boards, or fit into tight enclosures.

• No External Calibration: The device is trimmed and calibrated during manufacturing, saving you time and components.

Technical Specifications

• Sensor Type: Analog Temperature Sensor

• Package Type: TO-92 (Through-Hole)

• Temperature Sensing Range: 0C to +100C

• Output Voltage Scale: +10.0 mV/C

• Supply Voltage Range (VCC): 4V to 30V

• Accuracy: 0.6C at room temperature, 0.9C over full range

• Drain Current: Less than 60 microamps

Pinout Configuration Looking at the flat side of the LM35DZ with the leads pointing downward:

• Pin 1 (VCC): Input Voltage (4V to 30V)

• Pin 2 (VOUT): Analog Output Voltage

• Pin 3 (GND): Ground

Common Applications

• Microcontroller Prototyping: Ideal for Arduino, PIC, AVR, and Raspberry Pi projects.

• Environmental Monitoring: DIY weather stations and greenhouse temperature tracking.

• Thermal Protection: Overheating protection circuits for power supplies and amplifiers.

• HVAC Systems: Simple thermostat controllers and home automation integration.

Pro-Tip for Makers: Because the LM35DZ outputs an analog signal, using a stable voltage reference (like the internal 1.1V reference on an Arduino Uno) will significantly increase your reading accuracy and prevent fluctuations caused by USB power supply noise.