LM35DZ Precision Temperature Sensor TO-92 (Analog)

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LM35DZ Temperature Sensor

  • LM35DZ/LM35 is a temperature measuring device having an analog output voltage proportional to the temperature.
  • The LM35DZ sensor is presented with several types of encapsulations, the most common being the TO-92, which looks more like a transistor, and offers a great cost-benefit ratio, being the cheapest of the models and providing the same precision of the others.
  • It provides output voltage in Centigrade (Celsius). It does not require any external calibration circuitry.
  • The sensitivity of LM35 is 10 mV/degree Celsius. As temperature increases, output voltage also increases.

            E.g. 250 mV means 25°C.

  • It is a 3-terminal sensor used to measure surrounding temperature ranging from -55 °C to 150 °C.
  • LM35 gives temperature output which is more precise than thermistor output.


Pin Description

LM35 pins

VCC: Supply Voltage (4V – 30V)

Out: It gives analog output voltage which is proportional to the temperature (in degree Celsius).

GND: Ground

Some key parameters of the LM35DZ/LM35:
Main features of LM35 sensor
+ Input voltage from 4V to 30V
+ Output voltage resolution is 10mV / oC
+ High accuracy at 25 C is 0.5 C
+ Low output impedance 0.1 for 1mA load

The measured temperature range of the LM35 is from -55 C to 150 C with different output voltages. Consider the following voltage levels:
– Temperature -55 C output voltage -550mV
– Temperature 25 C output voltage 250mV
– Temperature 150 C output voltage 1500mV

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