LM35DZ Precision Analog Temperature Sensor (Available as Bare TO-92 or Waterproof Probe)

When you need a microcontroller to monitor the temperature of a room, a heatsink, or a liquid, the LM35DZ is the most user-friendly analog sensor available. Unlike thermistors that require complex lookup tables or digital sensors that require specific communication protocols, the LM35 operates on pure, simple analog logic. For every single degree Celsius the temperature rises, the sensor's output pin simply increases its voltage by exactly ten millivolts. For example, if the room is twenty-five degrees Celsius, the output pin will emit exactly two hundred and fifty millivolts.

This specific component is widely available in two common formats: the bare TO-92 package (which looks like a small, three-legged transistor) for standard circuit board mounting, and the "Probe" version. The probe version takes the exact same LM35 silicon and encapsulates it inside a rugged, rust-resistant stainless steel tube filled with thermally conductive epoxy, attaching it to a long wire lead. This makes the probe version perfectly suited for measuring soil temperatures, aquarium water, or outdoor weather conditions without short-circuiting the electronics.

Key Features & Functional Advantages

• Direct Celsius Calibration: The output is directly proportional to the Centigrade temperature scale, completely eliminating the need to do complex conversions from Fahrenheit or Kelvin in your code.

• No External Calibration Needed: It is laser-trimmed at the factory to be highly accurate right out of the box, requiring zero external resistors or calibration hardware.

• Ultra-Low Self-Heating: It draws less than sixty microamps of current during operation, ensuring the chip does not heat itself up and artificially skew your temperature readings.

• Wide Operating Voltage: Functions flawlessly on any power supply ranging from 4 Volts up to 30 Volts DC, making it instantly compatible with both standard 5-Volt logic boards and 12-Volt or 24-Volt industrial systems.

• Low Impedance Output: The strong analog output signal can travel across relatively long wires without picking up massive amounts of electrical noise.

Perfect For

• Environmental Monitoring: Building custom weather stations or smart thermostats for home automation.

• Liquid Temperature Sensing: The waterproof probe variant is ideal for monitoring hydroponic nutrient reservoirs, aquariums, or brewing vats.

• Thermal Protection: Bolting the flat side of a bare TO-92 package directly to a heavy power transistor or motor driver to trigger an emergency shutdown if the heatsink gets too hot.

• Educational Projects: The absolute best starting point for learning how to use an Analog-to-Digital Converter on an Arduino or Raspberry Pi Pico.

Technical Specifications

• Device Type: Precision Centigrade Temperature Sensor

• Measurement Range: 0 to 100 degrees Celsius (Specific to the "D" commercial variant)

• Output Scale: 10 millivolts per degree Celsius

• Accuracy: Typically within half a degree Celsius at room temperature

• Operating Voltage Range: 4.0 Volts to 30.0 Volts DC

• Package Type: 3-Pin TO-92 Plastic Package OR Encapsulated Stainless Steel Waterproof Probe

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Please note, a delivery fee of €4.99 applies for orders under €50. For those in remote areas, be aware that our couriers may apply an extra surcharge. This additional fee helps cover the costs of transporting your items to harder-to-reach locations.