LM35DZ Temperature Sensor

Overview

The LM35DZ Temperature Sensor is a precision, easy-to-use integrated circuit that provides a linear output voltage proportional to temperature in Celsius. With an output scale of 10mV per °C, stable performance, and low power consumption, the LM35DZ is ideal for embedded systems, environmental monitoring, and IoT projects.

Key Features

• Linear output: 10mV per °C (direct Celsius reading)
• Temperature range: 0°C to 100°C
• Supply voltage: 4V to 30V
• High accuracy: ±0.5°C at 25°C
• Low quiescent current: <60µA to reduce self-heating
• Compact TO-92 package for through-hole mounting
• No external calibration required
• Compatible with Arduino, Raspberry Pi, PIC, AVR and other microcontrollers

Technical Specifications

• Output scale: 10mV/°C (for example, 25°C = 250mV)
• Accuracy: typically ±0.5°C at 25°C
• Operating temperature range: 0°C to +100°C
• Supply voltage range: 4V to 30V
• Quiescent current: typically <60µA
• Package type: TO-92

Electrical Characteristics

• Low self-heating ensures measurement stability for ambient sensing
• Direct voltage output simplifies ADC measurement on microcontrollers
• Minimal external components required; typically only power and ground connections plus the analog input

Applications

• Environmental temperature monitoring
• Home automation and HVAC control systems
• Robotics and embedded systems
• Industrial and consumer electronics
• Battery management and thermal protection
• IoT sensor nodes and data logging

Integration and Wiring

Wiring the LM35DZ is straightforward: connect VCC to a 4V to 30V supply, connect GND to system ground, and measure the output voltage at the VOUT pin with an analog-to-digital converter (ADC).

Reading Temperature with a Microcontroller

• Measure VOUT in millivolts (mV).
• Convert to Celsius: Temperature (°C) = VOUT (mV) / 10.
• Example: VOUT = 250mV corresponds to 25°C.

Arduino Example (concept)

• Connect LM35DZ VOUT to an analog input (e.g., A0).
• Use ADC to read voltage, convert ADC counts to volts, then multiply volts by 100 to get °C (because 10mV/°C = 0.01V/°C).

Package and Mounting

The LM35DZ comes in a compact TO-92 package suitable for through-hole mounting. Its small footprint makes it easy to place on PCBs or breadboards for prototypes and production designs.

Why Choose LM35DZ

• Simple and direct Celsius output eliminates complex conversion or look-up tables
• Wide supply range and low power make it versatile for battery-powered and mains-powered systems
• High accuracy and low self-heating deliver reliable ambient temperature measurements

Ordering and Notes

Package type: TO-92. Note: Images are for illustration purposes only.