Precision Centigrade Temperature Sensor - LM35

LM35 (ACTIVE)

Precision Centigrade Temperature Sensor

Description

The LM35 series are precision integrated-circuit temperature devices with an output voltage linearly-proportional to the Centigrade temperature. The LM35 device has an advantage over linear temperature sensors calibrated in Kelvin, as the user is not required to subtract a large constant voltage from the output to obtain convenient Centigrade scaling. The LM35 device does not require any external calibration or trimming to provide typical accuracies of ±¼°C at room temperature and ±¾°C over a full −55°C to 150°C temperature range. Lower cost is assured by trimming and calibration at the wafer level. The low-output impedance, linear output, and precise inherent calibration of the LM35 device makes interfacing to readout or control circuitry especially easy. The device is used with single power supplies, or with plus and minus supplies. As the LM35 device draws only 60 μA from the supply, it has very low self-heating of less than 0.1°C in still air. The LM35 device is rated to operate over a −55°C to 150°C temperature range, while the LM35C device is rated for a −40°C to 110°C range (−10° with improved accuracy). The LM35-series devices are available packaged in hermetic TO transistor packages, while the LM35C, LM35CA, and LM35D devices are available in the plastic TO-92 transistor package. The LM35D device is available in an 8-lead surface-mount small-outline package and a plastic TO-220 package.

Features

  • Calibrated Directly in Celsius (Centigrade)
  • Linear + 10-mV/°C Scale Factor
  • 0.5°C Ensured Accuracy (at 25°C)
  • Rated for Full −55°C to 150°C Range
  • Suitable for Remote Applications
  • Low-Cost Due to Wafer-Level Trimming
  • Operates from 4 V to 30 V
  • Less than 60-μA Current Drain
  • Low Self-Heating, 0.08°C in Still Air
  • Non-Linearity Only ±¼°C Typical
  • Low-Impedance Output, 0.1 Ω for 1-mA Load

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Parametrics Compare all products in Analog Output

 
Local Sensor Accuracy (Max) (+/- C)
Sensor Gain (mV/Deg C)
Output Impedance (Ohm)
Supply Voltage (Min) (V)
Supply Voltage (Max) (V)
Supply Current (Max) (uA)
Shutdown
Interface
Special Features
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM35 LM94022 LM94022-Q1
0.5     1.5     1.5    
10     -5.5 to 13.6     -5.5 to 13.6    
0.4     5.2     5.2    
4     1.5     1.5    
30     5.5     5.5    
114     8.1     8.1    
No     No     No    
Analog Output     Analog Output     Analog Output    
  Selectable gain setting     Selectable gain setting    
Military     Catalog     Automotive    
-40 to 110
-55 to 150
0 to 100
0 to 70    
-50 to 150     -50 to 150    
3TO
3TO-220
3TO-92
8SOIC    
5SC70     5SC70    
  0.37 | 1ku     0.53 | 1ku    
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