National Semiconductor | High-performance Analog

 

 LM75A   

Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface
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Features

  • No external components required
  • Shutdown mode to minimize power consumption
  • Up to eight LM75As can be connected to a single bus
  • Power up defaults permit stand-alone operation as thermostat
  • Description

    The LM75A is an industry-standard digital temperature sensor with an integrated Sigma-Delta analog-to-digital converter and I 2C interface. The LM75A provides 9-bit digital temperature readings with an accuracy of ±2°C from -25°C to 100°C and ±3°C over -55°C to 125°C.

    The LM75A operates with a single supply from +2.7V to +5.5V. Communication is accomplished over a 2-wire interface which operates up to 400kHz. The LM75A has three address pins, allowing up to eight LM75A devices to operate on the same 2-wire bus. The LM75A has a dedicated over-temperature output (O.S.) with programmable limit and hysteresis. This output has programmable fault tolerance, which allows the user to define the number of consecutive error conditions that must occur before O.S. is activated.

    The wide temperature and supply range and I 2C interface make the LM75A ideal for a number of applications including base stations, electronic test equipment, office electronics, personal computers, and any other system where thermal management is critical to performance. The LM75A is available in an SOP-8 package and an MSOP-8 package.

    Key Specification
    Supply Voltage LM75A 2.7V to 5.5V
    Supply Current operating 280 μA (typ)
      shutdown 4 μA (typ)
    Temperature Accuracy −25°C to 100°C ±2°C (max)
      −55°C to 125°C ±3°C (max)


    Applications

  • General System Thermal Management
  • Communications Infrastructure
  • Electronic Test Equipment
  • Environmental Monitoring



  • Typical Application
    click for larger image


    Block Diagram
    click for larger image



    Typical Performance
    click for larger image


     

    ParametersValues
    Temperature Accuracy (+/-) 2 deg C
    Supply Min 2.7 Volt
    Quiescent Current 0.5 mA
    Temperature Min -55 deg C
    Temperature Max 125 deg C
    Interface Type 2-Wire Serial
    Programmable Setpoints Yes
    Resolution 9 bits
    Resolution degC/LSB 0.5
    Supply Max 5.5 Volt
    Shut down Yes
    Interrupt Outputs 1
    Fault Queue Yes
    Automotive Yes

    Datasheets
    TitleSizeDateOther
    Language
    LM75A Digital Temperature Sensor and Thermal Watchdog with Two-Wire Interface433
    Kbytes
    2-Nov-10日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-2113: Application Note 2113 Applying I2C Compatible Temperature Sensors in Systems with Slow Clock Edges81
    Kbytes
    3-May-11 

    Part Number(s)
    (NSID)
    Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM75AIM/NOPB


    RoHS Status


    SOIC NARROW
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide9062
    AVNET-EMWorldwide1451
    DIGI-KEYWorldwide0
    FARNELLEurope and Asia170
    MOUSERWorldwide141
    NEWARKAmericas74
    TAYLORAmericas9062
    $0.50 each at 1K+ pcsrail
    of
    95
    LM75AIMM/NOPB


    RoHS Status


    MINI SOIC
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide5033
    AVNET-EMWorldwide1794
    DIGI-KEYWorldwide1854
    TAYLORAmericas5033
    $0.50 each at 1K+ pcsreel
    of
    1000
    LM75AIMME/NOPB


    RoHS Status


    MINI SOIC
    Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide735
    DIGI-KEYWorldwide0
    MOUSERWorldwide750
    $0.53 each at 1K+ pcsreel
    of
    250
    LM75AIMMX/NOPB


    RoHS Status


    MINI SOIC
    Full production
    Lead Time: 8 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    $0.50 each at 1K+ pcsreel
    of
    3500
    LM75AIMX/NOPB


    RoHS Status


    SOIC NARROW
    Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide24072
    AVNET-EMWorldwide10000
    DIGI-KEYWorldwide0
    MOUSERWorldwide2160
    TAYLORAmericas24072
    $0.50 each at 1K+ pcsreel
    of
    2500

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM75A-5.0 MDC
    NONE
    NONE
    22 Jul 1999

    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM75A.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM75A is located at RoHS Status.

    Part Number(s)
    (NSID)
    DescriptionAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM75AEB/NOPB

    LM75AEB BoardFull production
    Lead Free (RoHS)

     

    Contact your distributor
    CALLN/A



    National Semiconductor follows the provisions of the Product Stewardship Guide for Customers (CSP-9-111C1) and Banned Substances and Materials of Interest Specification (CSP-9-111S2) for regulatory environmental compliance. Details may be found at: www.national.com/en/packaging/greennopb.html. Lead free products are RoHS compliant.

    Lead Free product status is available through the search tool located here

    Part Number(s)
    (NSID)
    Weight
    (milligrams)
    TypePinsMSL RatingPeak ReflowRoHS
    Status
    CAD SymbolsModelsPackage
    Marking
    Format
    LM75AIM/NOPB

    69.761
    69.761
    SOIC NARROW81260DetailDownloadN/A
    NSZXTT
    LM75
    AIM
    LM75AIMM/NOPB

    29.851
    MINI SOIC81260DetailDownloadN/A
    ZXTT
    T00A
    LM75AIMME/NOPB

    29.851
    MINI SOIC81260DetailDownloadN/A
    ZXTT
    T00A
    LM75AIMMX/NOPB

    29.851
    MINI SOIC81260DetailDownloadN/A
    ZXTT
    T00A
    LM75AIMX/NOPB

    69.761
    69.761
    SOIC NARROW81260DetailDownloadN/A
    NSZXTT
    LM75
    AIM

    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM75A.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM75A is located at RoHS Status.

    CAD Symbols and Models
    Download LM75A CAD Symbols
     Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM75AIMCMOS70213010015840003449464325
    LM75AIMMCMOS70213010015840003449464325
    LM75AIMMECMOS70213010015840003449464325
    LM75AIMMXCMOS70213010015840003449464325
    LM75AIMXCMOS70213010015840003449464325

    Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

    For more information on Reliability Metrics, please click here.


    All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

    Moisture Sensitivity Level Data for LM75A.

    A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

    National's certificate of product compliance for LM75A is located at RoHS Status.

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM75A-5.0 MDC
    NONE
    NONE
    22 Jul 1999

    [Information as of 9-Feb-2012]