LM75A

Digital temperature sensor and thermal watchdog


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The LM75A is a temperature-to-digital converter using an on-chip band gap temperature sensor and Sigma-delta A-to-D conversion technique. The device is also a thermal detector providing an overtemperature detection output. The LM75A contains a number of data registers: Configuration register (Conf) to store the device settings such as device operation mode, OS operation mode, OS polarity and OS fault queue as described in Section 7 "Functional description"; temperature register (Temp) to store the digital temp reading, and set-point registers (Tos and Thyst) to store programmable overtemperature shutdown and hysteresis limits, that can be communicated by a controller via the 2-wire serial I²C-bus interface. The device also includes an open-drain output (OS) which becomes active when the temperature exceeds the programmed limits. There are three selectable logic address pins so that eight devices can be connected on the same bus without address conflict.

The LM75A can be configured for different operation conditions. It can be set in normal mode to periodically monitor the ambient temperature, or in shutdown mode to minimize power consumption. The OS output operates in either of two selectable modes: OS comparator mode or OS interrupt mode. Its active state can be selected as either HIGH or LOW. The fault queue that defines the number of consecutive faults in order to activate the OS output is programmable as well as the set-point limits.

The temperature register always stores an 11-bit 2's complement data giving a temperature resolution of 0.125 Cel. This high temperature resolution is particularly useful in applications of measuring precisely the thermal drift or runaway.

The device is powered-up in normal operation mode with the OS in comparator mode, temperature threshold of 80 Cel and hysteresis of 75 Cel, so that it can be used as a stand-alone thermostat with those pre-defined temperature set points.

Features and benefits

  • Pin-for-pin replacement for industry standard LM75 and offers improved temperature resolution of 0.125 Cel and specification of a single part over power supply range from 2.8 V to 5.5 V
  • Small 8-pin package types: SO8 and TSSOP8
  • I²C-bus interface with up to 8 devices on the same bus
  • Power supply range from 2.8 V to 5.5 V
  • Temperatures range from -55 Cel to +125 Cel
  • 11-bit ADC that offers a temperature resolution of 0.125 Cel
  • Temperature accuracy of:
    • +-2 Cel from -25 Cel to +100 Cel
    • +-3 Cel from -55 Cel to +125 Cel
  • Programmable temperature threshold and hysteresis set points
  • Supply current of 3.5 uA in shutdown mode for power conservation
  • Stand-alone operation as thermostat at power-up
  • ESD protection exceeds 2000 V HBM per JESD22-A114, 200 V MM per JESD22-A115 and 1000 V CDM per JESD22-C101
  • Latch-up testing is done to JEDEC Standard JESD78 which exceeds 100 mA

Applications

  • System thermal management
  • Personal computers
  • Electronics equipment
  • Industrial controllers
Go to the parametric search
Parametric search

Show functional diagram

Block diagram: LM75AD, LM75ADP
Block diagram: LM75AD, LM75ADP
Block diagram: LM75AD, LM75ADP
Block diagram: LM75AD, LM75ADP

Parametrics of this product

Type numberPackage versionRemarksStandby current (uA)Operating Temperature (Cel)I2C-bus controlledPart typeAccuracy on-chip (±°C)Operating voltage (VDC)Assignable addressesSMBus clock (kHz)
LM75ADSOT96-1Extended temperature range, temperature to digital converter, programmable threshold3-55~1252.8~5.5Supervisor, Temperature2@-25~100?3@-55~1252.8~5.58400
LM75ADPSOT505-1Extended temperature range, temperature to digital converter, programmable threshold3-55~1252.8~5.5Supervisor, Temperature2@-25~100?3@-55~1252.8~5.58400

Package

Type numberPackageOutline versionReflow-/Wave solderingPackingProduct statusMarkingOrderable part number, (Ordering code (12NC))
LM75ADSO8
(SOT96-1)
sot096-1_poSO-SOJ-REFLOW
Wave_Soldering_Profile
Tape reel smdActiveLM75ALM75AD,118
( 9352 697 75118 )
Bulk PackActiveLM75ALM75AD,112
( 9352 697 75112 )
LM75ADPTSSOP8
(SOT505-1)
sot505-1_poReflow_Soldering_Profile
Wave_Soldering_Profile
Reel Pack, SMD, 13" Q1/T1ActiveL75ALM75ADP,118
( 9352 697 76118 )
LM75ADP/DGTSSOP8
(SOT505-1)
sot505-1_poReflow_Soldering_Profile
Wave_Soldering_Profile
Reel Pack, SMD, 13" Q1/T1ActiveL75ALM75ADP/DG,118
( 9352 886 14118 )
LM75ADP/S704TSSOP8
(SOT505-1)
sot505-1_poReflow_Soldering_Profile
Wave_Soldering_Profile
Reel Pack, SMD, 13" Q1/T1ActivenullLM75ADP/S704J
( 9353 000 52118 )

The variants in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.

Type numberPackageOutline versionReflow-/Wave solderingPackingProduct statusMarkingOrderable part number, (Ordering code (12NC))
LM75AD/DGSO8
(SOT96-1)
sot096-1_poSO-SOJ-REFLOW
Wave_Soldering_Profile
Tape reel smdDiscontinued
Replacement product
LM75ALM75AD/DG,118
( 9352 886 96118 )

Discontinuation information

Type numberOrdering code (12NC)Last-time buy dateLast-time delivery dateReplacement productDN NoticeStatusComments
LM75AD/01935276901118DN
LM75AD/01935276901112DN
LM75AD/DG93528869611831-Dec-1330-Jun-14LM75ADDN NXP-DN_201306022DN
    Replacement is drop in.
    LM75AD/G93527853111831-Dec-1030-Jun-11LM75ADDN 66
    • Multi source product
    • Standard availability
    Standard End of Life. Discontinued /G version only.
    LM75ADP/01935276906118DN

    Quality, reliability & chemical content

    Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFR (FIT)MTBF (hour)MSLMSL LF
    LM75ADLM75AD,118LM75ADweek 17, 20050.02.05E811
    LM75ADLM75AD,112LM75ADweek 17, 20050.02.05E811
    LM75ADPLM75ADP,118LM75ADPweek 13, 20050.02.05E811
    LM75ADP/DGLM75ADP/DG,118LM75ADP/DGAlways Pb-free0.02.05E811
    LM75ADP/S704LM75ADP/S704JLM75ADP/S704Always Pb-free0.02.05E811

    The variants in the table below are discontinued. See the table Discontinuation information at the bottom of this page for more information.

    Type numberOrderable part numberChemical contentRoHS / RHFLeadfree conversion dateEFRIFR (FIT)MTBF (hour)MSLMSL LF
    LM75AD/DGLM75AD/DG,118LM75AD/DGAlways Pb-free0.02.05E811
    Quality and reliability disclaimer

    Quality and reliability disclaimer

    Important Legal Notice on the product/generic quality information, No Warranty

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    Discontinuation information

    Type numberOrdering code (12NC)Last-time buy dateLast-time delivery dateReplacement productDN NoticeStatusComments
    LM75AD/01935276901118DN
    LM75AD/01935276901112DN
    LM75AD/DG93528869611831-Dec-1330-Jun-14LM75ADDN NXP-DN_201306022DN
      Replacement is drop in.
      LM75AD/G93527853111831-Dec-1030-Jun-11LM75ADDN 66
      • Multi source product
      • Standard availability
      Standard End of Life. Discontinued /G version only.
      LM75ADP/01935276906118DN

      Documentation for this product

      File nameTitleTypeFormatDate
      LM75ADigital temperature sensor and thermal watchdogData sheetpdf2007-07-10
      AN10441Level shifting techniques in I2C-bus designApplication notepdf2007-06-20
      AN10216I2C manualApplication notepdf2003-03-27
      AN10146I2C 2002-1A Evaluation BoardApplication notepdf2003-02-26
      75016543Create smarter, more efficient white goods; An industry-leading portfolio of cost-effective, power-saving solutions for major home appliancesBrochurepdf2008-06-01
      75016531Evaluate the I2C-bus with a comprehensive kit; NXP I2C 2002-1A evaluation board kits OM6285 and OM6278Leafletpdf2008-07-01
      75017424NXP I2C-bus solutions 2013: Smart, simple solutions for the 12 most common design concernsLeafletpdf2013-05-23
      design_con_2003_tecforum_i2c_bus_overviewDesignCon 2003 TecForum I 2 C Bus OverviewOther typepdf2003-01-27
      75015693I2C-bus temperature sensors; Small, accurate, low-cost sensors for advanced temperature regulationSelection guidepdf2006-11-01
      UM10204I2C-bus specification and user manualUser manualpdf2014-04-28
      UM10206I2C Demonstration Board 2005-1 Quick Start GuideUser manualpdf2006-06-12
      SOT96-1_118SO8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118Packingpdf2013-04-19
      SOT96-1_115Tape reel SMD; standard product orientation 12NC ending 115Packingpdf2012-11-23
      Wave_Soldering_ProfileWave Soldering ProfileWave solderingpdf2013-09-30
      SOT96-1_518SO8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending, 518 or Y Ordering code (12NC) ending 518Packingpdf2014-06-02
      SO-SOJ-REFLOWFootprint for reflow solderingReflow solderingpdf2009-10-08
      SO-SOJ-WAVEFootprint for wave solderingWave solderingpdf2009-10-08
      sot096-1_poplastic small outline package; 8 leads; body width 3.9 mmOutline drawingpdf2009-10-08
      SOT505-1_118TSSOP8; Reel pack; SMD, 13" Q1/T1 Standard product orientation Orderable part number ending ,118 or J Ordering code (12NC) ending 118Packingpdf2013-04-15
      Reflow_Soldering_ProfileReflow Soldering ProfileReflow solderingpdf2013-09-30
      Wave_Soldering_ProfileWave Soldering ProfileWave solderingpdf2013-09-30
      SSOP-TSSOP-VSO-WAVEFootprint for wave solderingWave solderingpdf2009-10-08
      sot505-1_poplastic thin shrink small outline package; 8 leads; body width 3 mmOutline drawingpdf2009-10-08
      sot505-1_frFootprint for reflow soldering SOT505-1Reflow solderingpdf2010-07-20

      Ordering & availability

      Type numberOrdering code (12NC)Orderable part numberRegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
      LM75AD9352 697 75118LM75AD,118EUAvnet Express57,500250007/29/2014Buy online 
         NAFuture Electronics40,000250007/29/2014Buy online 
         ASIAAvnet Express25,000250007/29/2014Buy online 
         NADigiKey17,79717/30/2014Buy online 
         ASIAWPI12,550250007/29/2014Buy online 
         NAMouser Electronics6,67307/29/14Buy online 
         GLOBALArrow Electronics5,000250029/07/2014Buy online 
         ASIAChip One Stop2,09507/30/2014Buy online 
      LM75AD9352 697 75112LM75AD,112NAFuture Electronics4,708107/29/2014Buy onlineNot available
         NADigiKey3,91117/30/2014Buy online 
         GLOBALArrow Electronics2,464129/07/2014Buy online 
         EUAvnet Express2,40010007/29/2014Buy online 
         NAMouser Electronics1,10707/29/14Buy online 
         NAAvnet Express96107/29/2014Buy online 
      LM75ADP9352 697 76118LM75ADP,118NADigiKey10,19517/30/2014Buy online 
         NAFuture Electronics10,000250007/29/2014Buy online 
         ASIASACC - Singapore2,500250007/30/2014Buy online 
         ASIAWPI2,500250007/29/2014Buy online 
         NAMouser Electronics2,42707/29/14Buy online 
         NANewark element141,815130/07/2014Buy online 
         GLOBALArrow Electronics1,631129/07/2014Buy online 
         EUFarnell Europe514129/07/2014Buy online 
         ASIAElement 1410129/07/2014Buy online 
      LM75ADP/DG9352 886 14118LM75ADP/DG,118NADigiKey50517/30/2014Buy onlineNot available
      LM75ADP/S7049353 000 52118LM75ADP/S704J      Not available

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