11- to 14-Bit Digital Temperature Sensor With 2-Wire Interface

11- to 14-Bit Digital Temperature Sensor With 2-Wire Interface - LM73-Q1


The LM73-Q1 is a digital output temperature sensor featuring an integrated incremental Delta-Sigma ADC. The LM73-Q1 communicates with a two-wire interface that is compatible with SMBus and I2C interfaces, and the host can query the LM73-Q1 at any time to read temperature.

The LM73-Q1 operates over a wide temperature range (–40°C to 125°C) and provides ±1.45°C accuracy from –10°C to 80°C. The LM73-Q1 includes four selectable resolution options that allow the temperature conversion time and sensitivity to be adjusted for optimal performance. The LM73-Q1 defaults to 11-bit mode (0.25°C/LSB), and will measure temperature in a maximum time of 14 ms, making it ideal for applications that require temperature data very soon after power-up. In its 14-bit maximum resolution mode (0.03125°C/LSB), the LM73-Q1 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, the LM73-Q1 has a time-out feature that will automatically reset the clock and data lines, if these lines are held low for an extended period of time. This prevents a bus lock-up condition without requiring host processor intervention.


  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results
    • LM73-Q1 Temperature grade 1: –40°C to 125°C
    • LM73-Q1 HBM ESD Classification Level 2
    • LM73-Q1 CDM ESD Classification Level C6
  • 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
  • Temperature Accuracy: ±1.45°C (Maximum)
  • Temperature Range: –40°C to 125°C
  • Conversion Time
    • 11-Bit (0.25°C): 14 ms (Maximum)
    • 14-Bit (0.03125°C): 112 ms (Maximum)
  • Operating Supply Current: 320 µA (Typical)
  • Shutdown Supply Current: 1.9 µA (Typical)
  • Resolution: 0.25°C to 0.03125°C

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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)
Package Group
Package Size: mm2:W x L (PKG)
Iq (Typ) (uA)
LM73-Q1 TMP100-Q1 TMP101-Q1 TMP75-Q1
I2C, SMBus, 2-Wire    I2C, SMBus, 2-Wire    I2C, SMBus, 2-Wire    I2C, SMBus, 2-Wire   
1.45    2    2    1.5   
14    12    12    12   
-40 to 125    -40 to 125    -40 to 125    -40 to 125   
2.7    2.7    2.7    2.7   
5.5    5.5    5.5    5.5   
320    45    45    50   
550    75    75    85   
Configurable Resolution, Programmable Alert, One-Shot Conversion, Shutdown    Configurable Resolution, One-Shot Conversion, Shutdown    Configurable Resolution
Programmable Alert
Fault Queue
One-Shot Conversion
Configurable Resolution
Programmable Alert
Fault Queue
One-Shot Conversion
6    8    3    8   
Automotive    Automotive    Automotive    Automotive   
SOT-23-THIN    SOT-23    SOT-23    SOIC
6SOT-23-THIN: 8 mm2: 2.8 x 2.9(SOT-23-THIN)    6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)    6SOT-23: 8 mm2: 2.8 x 2.9(SOT-23)    8SOIC: 29 mm2: 6 x 4.9(SOIC)
8VSSOP: 15 mm2: 4.9 x 3(VSSOP)   
320    45    45    50   

Other qualified versions of LM73-Q1

Version Part Number Definition
Catalog LM73 TI's standard catalog product