±1°C Temperature Sensor with I2C/SMBus Interface - LM73


±1°C Temperature Sensor with I2C/SMBus Interface


The LM73 is an integrated, digital-output temperature sensor featuring an incremental Delta-Sigma ADC with a two-wire interface that is compatible with the SMBus and I2C interfaces. The host can query the LM73 at any time to read temperature.

Available in a 6-pin SOT package, the LM73 occupies very little board area while operating over a wide temperature range (–40°C to 150°C) and providing ±1°C accuracy from –10°C to 80°C. The user can optimize between the conversion time and the sensitivity of the LM73 by programming it to report temperature in any of four different resolutions. Defaulting to 11-bit mode (0.25°C/LSB), the LM73 measures temperature in a maximum time of 14 ms, making it ideal for applications that require temperature data very soon after power-up. In its maximum resolution, 14-bit mode (0.03125°C/LSB), the LM73 is optimized to sense very small changes in temperature.

A single multi-level address line selects one of three unique device addresses. An open-drain ALERT output goes active when the temperature exceeds a programmable limit. Both the data and clock lines are filtered for excellent noise tolerance and reliable communication. Additionally, a time-out feature on the clock and data lines causes the LM73 to automatically reset these lines if either is held low for an extended time, thus exiting any bus lock-up condition without processor intervention.


  • Single Address Pin Offers Choice of Three
    Selectable Addresses Per Version for a Total of
    Six Possible Addresses.
  • SMBus and I2C-compatible Two-Wire Interface
  • Supports 400-Khz Operation
  • Shutdown Mode With One-shot Feature Available
    for Very Low Average Power Consumption
  • Programmable Digital Temperature Resolution
    From 11 Bits to 14 Bits
  • Fast Conversion Rate Ideal for Quick Power Up
    and Measuring Rapidly Changing Temperature
  • Open-Drain ALERT Output Pin Goes Active When
    Temperature is Above a Programmed
    Temperature Limit
  • Very Stable, Low-noise Digital Output
  • UL Recognized Component
  • Key Specifications
    •  Supply Current
      • Operating
        • 320 µA (Typical)
        • 495 µA (Maximum)
      • Shutdown
        • 8 µA (Maximum)
        • 1.9 µA (Typical)
    • Temperature Accuracy
      • −10°C to 80°C: ±1.0°C (Maximum)
      • −25°C to 115°C: ±1.5°C (Maximum)
      • −40°C to 150°C: ±2°C (Maximum)
    • Resolution
      • 0.25°C to 0.03125°C
    • Conversion Time
      • 11-Bit (0.25°C): 14 ms (Maximum)
      • 14-Bit (0.03125°C): 112 ms (Maximum)

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Parametrics Compare all products in Digital Output

Local Sensor Accuracy (Max) (+/- C)
Temp Resolution (Max) (bits)
Operating Temperature Range (C)
Supply Voltage (Min) (V)
Supply Voltage (Max) (V)
Supply Current (Typ) (uA)
Supply Current (Max) (uA)
Special Features
Package Group
Estimated Package Size (WxL) (mm2)
Approx. Price (US$)
Iq (Typ) (uA)
LM73 TMP100 TMP101
I2C, SMBus, 2-Wire     I2C, SMBus, 2-Wire     I2C, SMBus, 2-Wire    
1     2     2    
14     12     12    
-40 to 150     -55 to 125     -55 to 125    
2.7     2.7     2.7    
5.5     5.5     5.5    
320     45     45    
550     75     75    
Configurable Resolution
Programmable Alert
One-Shot Conversion
Configurable Resolution
One-Shot Conversion
Configurable Resolution
Programmable Alert
Fault Queue
One-Shot Conversion
6     8     8    
Catalog     Catalog     Catalog    
SOT     SOT-23     SOT-23    
6SOT: 1.6 x 2.9: 10 mm2     6SOT-23: 1.6 x 2.9: 10 mm2     6SOT-23: 1.6 x 2.9: 10 mm2    
0.75 | 1ku     0.75 | 1ku     0.80 | 1ku    
320     45     45    
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