LM35 Analog Temperature Sensor Module

Overview

The LM35 Analog Temperature Sensor Module is one of the most widely used analog temperature sensing modules in electronics and educational projects. Unlike thermistors, the LM35 provides a factory-calibrated linear output of 10 mV per °C, eliminating the need for complex calibration.

Most Chinese manufacturers produce this module using the original LM35 sensor or an LM35-compatible equivalent mounted on a compact PCB with three interface pins: VCC, GND, and Analog Output. Because it outputs an analog voltage rather than digital data, it is ideal for microcontrollers equipped with ADC inputs.

Its low power consumption, high accuracy, and simple interface make it suitable for robotics, weather stations, HVAC systems, battery monitoring, industrial control, and environmental sensing.

Specifications

Sensor IC: Texas Instruments LM35 Precision Centigrade Temperature Sensor

Sensor Type: Analog Linear Temperature Sensor

Operating Voltage: 4 V to 30 V DC

Current Consumption: Less than 60 µA

Temperature Measurement Range: -55°C to +150°C
(Common module operating range: 0°C to 100°C)

Output Signal: Analog Voltage

Output Scale: 10 mV/°C

Accuracy:
• ±0.5°C (Typical at 25°C)
• ±1°C (Typical over normal operating range)

Resolution: Depends on the ADC resolution of the connected microcontroller.

Interface:
• VCC
• GND
• Analog OUT

Operating Principle: Output voltage increases by approximately 10 mV for every 1°C rise in temperature.

Module Operating Temperature: -40°C to +85°C

PCB Dimensions: Approximately 18 × 15 mm

Weight: Approximately 2–4 g