LM75A

Digital temperature sensor and thermal watchdog


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Product description

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

  • 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
All information on this product information page is subject to the subsequent disclaimers:
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Show functional diagram

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

Products / Packages

Type numberOrderable part numberOrdering code (12NC)Product statusPackagePackingMarkingECCN
LM75ADLM75AD,1129352 697 75112Volume productionSOT96-1
(SO8) 		TubeStandard Marking
LM75ADLM75AD,1189352 697 75118Volume productionSOT96-1
(SO8) 		Tape reel smdStandard Marking
LM75AD/DGLM75AD/DG,1189352 886 96118Volume productionSOT96-1
(SO8) 		Tape reel smdStandard Marking
LM75ADPLM75ADP,1189352 697 76118Volume productionSOT505-1
(TSSOP) 		Reel Pack, SMD, 13"Standard Marking
LM75ADP/DGLM75ADP/DG,1189352 886 14118Volume productionSOT505-1
(TSSOP) 		Reel Pack, SMD, 13"Standard Marking

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 numberOrdering code (12NC)Product statusPackagePackingMarkingECCN
LM75AD/GLM75AD/G,1189352 785 31118Withdrawn
Replacement product		SOT96-1
(SO8) 		Tape reel smdStandard Marking
LM75AD/01LM75AD/01,1129352 769 01112Withdrawn
Replacement product		SOT96-1
(SO8) 		TubeStandard Marking
LM75AD/01LM75AD/01,1189352 769 01118Withdrawn
Replacement product		SOT96-1
(SO8) 		Tape reel smdStandard Marking
LM75ADP/01LM75ADP/01,1189352 769 06118Withdrawn
Replacement product		SOT505-1
(TSSOP) 		Reel Pack, SMD, 13"Standard Marking

Discontinuation information

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

Parametrics of this product

Type numberPackageStandby
current(uA)		Operating
temp.(Cel)		Part typeREMARKSI²C-bus
controlled		Over Temperature AlertRemote Temperature MonitorAssignable AddressesUnder Temperature AlertInternal Temperature MonitorOperating voltage(VDC)Accuracy on-chip( ±°C)SMBus Clock (max)(kHz)
LM75ADSOT96-1
(SO8)		3.5-55~125Supervisor, TemperatureExtended temperature range, temperature to digital converter, programmable thresholdyesyesno8noyes2.8~5.52@-25~100?3@-55~125400.0
LM75ADPSOT505-1
(TSSOP)		3.5-55~125Supervisor, TemperatureExtended temperature range, temperature to digital converter, programmable thresholdyesyesno8noyes2.8~5.52@-25~100?3@-55~125400.0

Quality, reliability & chemical content

Type numberOrderable part numberChemical contentRoHSLeadfree conversion dateRHFIFR (FIT)MTBF (hours)MSLMSL LF
LM75ADLM75AD,112LM75ADweek 17, 2005nullnull11
LM75ADLM75AD,118LM75ADweek 17, 2005nullnull11
LM75AD/DGLM75AD/DG,118LM75AD/DGAlways Pb-free11
LM75ADPLM75ADP,118LM75ADPweek 13, 2005nullnull11
LM75ADP/DGLM75ADP/DG,118LM75ADP/DGAlways Pb-free11

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 contentRoHSLeadfree conversion dateRHFIFR (FIT)MTBF (hours)MSLMSL LF
LM75AD/GLM75AD/G,118Always Pb-free11
LM75AD/01LM75AD/01,11211
LM75AD/01LM75AD/01,11811
LM75ADP/01LM75ADP/01,118week 19, 200511
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/G93527853111831-Dec-1030-Jun-11LM75ADDN 66
  • Multi source product
  • Standard availability
Standard End of Life. Discontinued /G version only.
LM75AD/01935276901112DN
LM75AD/01935276901118DN
LM75ADP/01935276906118DN

Documentation for this product

Ordering & availability

Type numberOrdering code(12NC)Orderable part numberRegionDistributorIn stockOrder quantityInventory dateBuy onlineSamples
LM75AD9352 697 75112LM75AD,112EUFUTURE ELECTRONICS UK18,2992/6/2012Buy onlinenot available
   NAARROW ELECTRONICS9,4752/10/2012Buy online 
   EUARROW EUROPE4,9972/3/2012Buy online 
   NAWPG AMERICAS INC.3,9002/10/2012Buy online 
   ASIAWPI3,900200002/10/2012Buy online 
   NADIGI-KEY CORPORATION2,2672/10/2012Buy online 
   NAMOUSER ELECTRONICS1,7892/10/2012Buy online 
   NAMOUSER ELECTRONICS1,7892/10/2012Buy online 
   NAFUTURE ELECTRONICS1,3652/6/2012Buy online 
   JAPANCHIP ONE STOPno02/10/2012Buy online 
LM75AD9352 697 75118LM75AD,118ASIAFUTURE ELECTRONICS- ASIA235,0002/6/2012Buy online 
   ASIAAVNET EXPRESS ASIA37,5001/12/2012Buy online 
   ASIAWPI2,600250002/10/2012Buy online 
   NAAVNET ELECTRONICS MARKETING1,2552/10/2012Buy online 
   JAPANCHIP ONE STOPyes02/10/2012Buy online 
LM75AD/DG9352 886 96118LM75AD/DG,118       
LM75ADP9352 697 76118LM75ADP,118NADIGI-KEY CORPORATION22,0212/10/2012Buy online 
   NAAVNET ELECTRONICS MARKETING16,9402/10/2012Buy online 
   NAMOUSER ELECTRONICS7,2202/10/2012Buy online 
   NAMOUSER ELECTRONICS7,2202/10/2012Buy online 
   EUFUTURE ELECTRONICS UK2,5002/6/2012Buy online 
   NAARROW ELECTRONICS1,1632/10/2012Buy online 
   NAFUTURE ELECTRONICS7652/6/2012Buy online 
   ASIAELEMENT14 APAC1182/10/2012Buy online 
   ASIAFUTURE ELECTRONICS- ASIA102/6/2012Buy online 
   JAPANCHIP ONE STOPyes02/10/2012Buy online 
LM75ADP/DG9352 886 14118LM75ADP/DG,118NADIGI-KEY CORPORATION6752/10/2012Buy online 

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