±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 Local Digital Temperature Sensors

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
Package Size: mm2:W x L (PKG)
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    3   
Catalog    Catalog    Catalog   
SOT    SOT-23    SOT-23   
6SOT: 8 mm2: 2.8 x 2.9(SOT)    6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)    6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)   
0.75 | 1ku    0.75 | 1ku    0.80 | 1ku   
320    45    45   

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