Texas Instruments : Temperature sensor : LM35A

Manufacturer nameTexas Instruments
Category1  Sensor
Category3A/D converter
Conmponents Classification  Temperature sensor
Model NumberLM35A      Datasheet   


The LM35 series are high accuracy integrated circuit temperature devices whose output voltage is directly proportional to the temperature in degrees Celsius. LM35 devices have the advantage over linear temperature sensors that are calibrated in degrees Kelvin that a large constant voltage does not need to be subtracted from the output to obtain a usable value in degrees Celsius. The LM35 device requires no external calibration or trimming and maintains an accuracy (typical) of ±¼°C at room temperature and ±¾°C over the entire temperature range of -55°C to 150°C. Trimming and calibration at the wafer level ensures low cost. The low output impedance, linear output, and accurate built-in calibration make the LM35 device very easy to connect to readout or control circuitry. The devices can be used with a single power supply or with positive and negative power supplies. The LM35’s current consumption of only 60 µA results in very low self-heating, less than 0.1°C with no airflow. LM35 devices are rated for operation over a temperature range of -55°C to 150°C, LM35C devices are rated for -40°C to 110°C (-10°C for improved accuracy). LM35 series devices are available in sealed TO transistor packages, while LM35C, LM35CA, and LM35D devices are available in plastic TO-92 transistor packages. The LM35D device is available in an 8-lead surface mount, small outline package and a plastic TO-220 package.



  • Direct calibration to Celsius temperature (direct reading in Celsius)
  • Linear, +10mV/°C scale factor
  • 0.5°C accuracy guaranteed (at 25°C)
  • Rated for the entire range of -55°C to 150°C
  • Ideal for remote applications
  • Low cost due to wafer-level trimming
  • Operates from 4V to 30V
  • Current consumption less than 60µA
  • Low self-heating, 0.08°C with no airflow
  • Nonlinearity as low as ±¼°C (typical)
  • Low impedance output, 0.1Ω at 1mA load
  • 摂氏温度に直接較正(摂氏直読)
  • リニア、+10mV/°Cのスケール係数
  • 0.5°C精度を保証(25°Cにおいて)
  • -55°Cから150°Cまでの範囲全体が定格内
  • リモート・アプリケーションに最適
  • ウェハー・レベルのトリミングにより低コストを実現
  • 4V~30Vで動作
  • 消費電流60μA未満
  • 低い自己発熱、無風状態で0.08°C
  • 非直線性がわずか±¼°C (標準値)
  • 低インピーダンスの出力、1mA負荷で0.1Ω


  • Power Supply
  • Battery management
  • HVAC (heating, ventilation, air conditioning)
  • Home appliances
  • 電源
  • バッテリ管理
  • HVAC (暖房、通気、エアコン)
  • 家電製品