2.7V, SOT-23, 11- to 14- Bit Digital Temperature Sensor with 2-Wire Interface - LM73


2.7V, SOT-23, 11- to 14- Bit Digital Temperature Sensor with 2-Wire 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 I 2C® interfaces. The host can query the LM73 at any time to read temperature. Available in a 6-pin SOT-23 package, the LM73 occupies very little board area while operating over a wide temperature range (-40°C to 150°C) and providing ±1.0°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 I 2C-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 ouput.
  • UL Recognized Component

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    Parametrics Compare all products in Digital Output

    Local Sensor Accuracy (Max) (+/- C)
    Temp Resolution (Max) (bits)
    Supply Current (Typ) (uA)
    Supply Voltage (Min) (V)
    Supply Voltage (Max) (V)
    Programmable Alert
    Special Features
    Operating Temperature Range (C)
    Approx. Price (US$)
    One Shot Conversion Control    
    -40 to 150    
    0.75 | 1ku    
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