National Semiconductor | High-performance Analog

 

 LM74   
SPI/ 12-Bit Plus Sign Temperature Sensor 		Click link to Download

Features

  • 0.0625°C temperature resolution.
  • Shutdown mode conserves power between temperature reading
  • SPI and MICROWIRE Bus interface
  • 5-Bump micro SMD package saves space

    • Description

    The LM74 is a temperature sensor, Delta-Sigma analog-to-digital converter with an SPI and MICROWIRE compatible interface. The host can query the LM74 at any time to read temperature. A shutdown mode decreases power consumption to less than 10 μA. This mode is useful in systems where low average power consumption is critical.

    The LM74 has 12-bit plus sign temperature resolution (0.0625°C per LSB) while operating over a temperature range of −55°C to +150°C.

    The LM74's 3.0V to 5.5V supply voltage range, low supply current and simple SPI interface make it ideal for a wide range of applications. These include thermal management and protection applications in hard disk drives, printers, electronic test equipment, and office electronics. The LM74 is available in the SO-8 package as well as an 5-Bump micro SMD package.

    Key Specification
    ■  Supply Voltage   3.0V or 2.65V to 5.5V
    ■  Supply Current operating 265μA (typ)
        520μA (max)
    shutdown 3μA (typ)
    ■  Temperature Accuracy −10°C to 65°C ±1.25°C(max)
      −25°C to 110°C ±2.1°C(max)
      −55°C to 125°C ±3°C(max)


    Applications

  • System Thermal Management
  • Personal Computers
  • Disk Drives
  • Office Electronics
  • Electronic Test Equipment

    • Also Recommended
    LM70▲In LLP Package
    LM74A▲The LM74 In Die Form



    Typical Application
    click for larger image


    		Block Diagram
    click for larger image



    Typical Performance
    click for larger image


    Parameters / ValuesLM74 LM70 LM74A
    Temperature Accuracy (+/-)1.25 deg C 2 deg C 3.5 deg C
    Supply Min4.5, 3 Volt 2.7 Volt 4.5 Volt
    Quiescent Current0.52 mA 0.49 mA 0.52 mA
    Temperature Min-55 deg C -55 deg C -40 deg C
    Temperature Max150 deg C 150 deg C 150 deg C
    Interface TypeSPI/Microwire SPI/Microwire SPI/Microwire
    Programmable SetpointsNo No No
    Resolution13 bits 11 bits 13 bits
    Resolution degC/LSB0.0625 0.25 0.0625
    Supply Max5.5, 3.6 Volt 5.5 Volt 5.5 Volt
    Shut downYes Yes Yes
    Fault QueueNo No No
    AutomotiveYes Yes

    Datasheets
    TitleSizeDateOther
    Language
    LM74 SPI/ 12-Bit Plus Sign Temperature Sensor410
    Kbytes    		1-Mar-11日本語  


    Application Notes
    TitleSizeDateOther
    Language
    AN-1256: Application Note 1256 Tiny Temperature Sensors for Portable Systems66
    Kbytes    		1-Oct-02 


    Other Technical Documents
    TitleTypeDate
    Sensing and Monitoring for Control and Protection SeminarApp Note 2003-02-17
    Tiny Temperature Sensors for Portable SystemsApp Note 2003-03-06
    Tiny Temperature Sensors for Remote SystemsApp Note 2003-02-17

    Part Number(s)
    (NSID)    		Top ViewAvailabilityCurrent Reported StockBudgetary PricingPack
    Size
    LM74CIM-3/NOPB

    LM74CIM-3

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide375
    AVNET-EMWorldwide299
    DIGI-KEYWorldwide0
    FARNELLEurope and Asia684
    MOUSERWorldwide637
    NEWARKAmericas396
    RS COMPONENTSWorldwide165
    TAYLORAmericas1054
    		$0.62 each at 1K+ pcsrail
    of
    95
    LM74CIM-5/NOPB

    LM74CIM-5

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    ARROWWorldwide451
    AVNET-EMWorldwide318
    DIGI-KEYWorldwide786
    FARNELLEurope and Asia1313
    MOUSERWorldwide659
    NEWARKAmericas323
    RS COMPONENTSWorldwide182
    TAYLORAmericas1401
    		$0.62 each at 1K+ pcsrail
    of
    95
    LM74CIMX-3/NOPB

    LM74CIMX-3

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    ARROWWorldwide3700
    DIGI-KEYWorldwide0
    MOUSERWorldwide2500
    TAYLORAmericas3700
    		$0.62 each at 1K+ pcsreel
    of
    2500
    LM74CIMX-5/NOPB

    LM74CIMX-5

    RoHS Status

    SOIC NARROW    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    AVNET-EMWorldwide2500
    DIGI-KEYWorldwide0
    MOUSERWorldwide1500
    		$0.62 each at 1K+ pcsreel
    of
    2500
    LM74CITP-3/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

    Samples
    DistributorRegionQty
    AVNET-EMWorldwide250
    DIGI-KEYWorldwide0
    MOUSERWorldwide750
    		$0.72 each at 1K+ pcsreel
    of
    250
    LM74CITPX-3/NOPB


    RoHS Status

    MICRO SMD    		Full production
    Lead Time: 6 weeks

     
    DistributorRegionQty
    DIGI-KEYWorldwide0
    		$0.72 each at 1K+ pcsreel
    of
    3000

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM74A-3 MDA
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM74CIBP-3
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008
    LM74CIBP-5
    		NONE
    		NATIONAL SEMICONDUCTOR
    		24 Jul 2009
    LM74CIBPX-3
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008
    LM74CIBPX-5
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008
    LM74CITP-5
    		LM74CIM-5
    		National Semiconductor
    		30 Nov 2009
    LM74CITPX-5
    		LM74CIMX-5
    		National Semiconductor
    		30 Nov 2009

    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 LM74.

    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 LM74 is located at RoHS Status.

    Part Number(s)
    (NSID)    		Weight
    (milligrams)    		TypePinsMSL RatingPeak ReflowRoHS
    Status    		CAD SymbolsModelsPackage
    Marking
    Format
    LM74CIM-3/NOPB

    LM74CIM-3
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailDownloadN/A
    		NSZXTT
    LM74
    CIM3
    LM74CIM-5/NOPB

    LM74CIM-5
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailDownloadN/A
    		NSZXTT
    LM74
    CIM5
    LM74CIMX-3/NOPB

    LM74CIMX-3
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailDownloadN/A
    		NSZXTT
    LM74
    CIM3
    LM74CIMX-5/NOPB

    LM74CIMX-5
    		69.761
    70.001
    		SOIC NARROW81
    1    		260
    235    		DetailDownloadN/A
    		NSZXTT
    LM74
    CIM5
    LM74CITP-3/NOPB

    		2.258
    		MICRO SMD51260DetailDownloadN/A
    		XV
    I 10
    LM74CITPX-3/NOPB

    		2.258
    		MICRO SMD51260DetailDownloadN/A
    		XV
    I 10

    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 LM74.

    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 LM74 is located at RoHS Status.

    CAD Symbols and Models
    Download LM74 CAD Symbols
    		 Models
    N/A


    Reliability Metrics
    Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
    LM74CIM-3CS065247473430552700011568301341
    LM74CIM-5CS065247473430552700011568301341
    LM74CIMX-3CS065247473430552700011568301341
    LM74CIMX-5CS065247473430552700011568301341
    LM74CITP-3CS065247473430552700011568301341
    LM74CITPX-3CS065247473430552700011568301341

    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 LM74.

    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 LM74 is located at RoHS Status.

    Obsolete Versions
    Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
    LM74A-3 MDA
    		NONE
    		NATIONAL SEMICONDUCTOR
    		03 Dec 2008
    LM74CIBP-3
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008
    LM74CIBP-5
    		NONE
    		NATIONAL SEMICONDUCTOR
    		24 Jul 2009
    LM74CIBPX-3
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008
    LM74CIBPX-5
    		NONE
    		NATIONAL SEMICONDUCTOR
    		16 Nov 2008
    LM74CITP-5
    		LM74CIM-5
    		National Semiconductor
    		30 Nov 2009
    LM74CITPX-5
    		LM74CIMX-5
    		National Semiconductor
    		30 Nov 2009

    [Information as of 9-Feb-2012]
    Copyright © 2011 National Semiconductor Corporation