LM50 - SOT-23 Single-Supply Centigrade Temperature Sensor
Datasheet Packaging Samples & Pricing Reliability Application Notes Knowledge Base

Features
•Calibrated directly in degree Celsius (Centigrade)
•Linear + 10.0 mV/°C scale factor
•±2°C accuracy guaranteed at +25°C
•Specified for full -40° to +125°C range
•Suitable for remote applications
•Low cost due to wafer-level trimming
•Operates from 4.5V to 10V
•Less than 130 µA current drain
•Low self-heating, less than 0.2°C in still air
•Nonlinearity less than 0.8°C over temp
•UL Recognized Component

General Description

The LM50 is a precision integrated-circuit temperature sensor that can sense a -40°C to +125°C temperature range using a single positive supply. More...


Applications

•Computers
•Disk Drives
•Battery Management
•Automotive
•FAX Machines
•Printers
•Portable Medical Instruments
•HVAC
•Power Supply Modules
  Typical Application
click for larger image


ParametersValues
Temperature Accuracy (+/-) 2, 3 deg C
Supply Min 4.5 Volt
Quiescent Current_ 130 uA
Temperature Min -25, -40 deg C
Temperature Max 125, 100 deg C
Sensor Gain 10 mV/Deg C
Supply Max 10 Volt
Single Supply Yes
Output Impedance 2000 Ohm
Quiescent Current 0.13 mA
Automotive Yes


Typical Performance

click for larger image


  Additional Resources
Application Notes


Connection Diagram

*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM50 SOT-23 Single-Supply Centigrade Temperature Sensor 605
Kbytes		 10-Feb-06 Download
LM50 SOT-23 Single-Supply Centigrade Temperature Sensor (Japanese)
 290 Kbytes   Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM50BIM3SOT-233NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.59reel
of
1000		T5B
XTT
6 weeks1000
LM50CIM3SOT-233NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.32reel
of
1000		T5C
XTT
6 weeks2500
LM50BIM3XSOT-233NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.59reel
of
3000		T5B
XTT
6 weeks5000
LM50CIM3XSOT-233NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.32reel
of
3000		T5C
XTT
6 weeks7500
LM50C MDCUnpackaged DieLifetime buyN/A
  CALLtray
of
N/A		-
N/AN/A

Obsolete Versions

Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM50B MDC
NONE
NATIONAL SEMICONDUCTOR
03 Dec 2008
LM50C MDC
NONE
NATIONAL SEMICONDUCTOR
01 Dec 2009

General Description

The LM50 is a precision integrated-circuit temperature sensor that can sense a -40°C to +125°C temperature range using a single positive supply. The LM50's output voltage is linearly proportional to Celsius (Centigrade) temperature (+10 mV/°C) and has a DC offset of +500 mV. The offset allows reading negative temperatures without the need for a negative supply. The ideal output voltage of the LM50 ranges from +100 mV to +1.75V for a -40°C to +125°C temperature range. The LM50 does not require any external calibration or trimming to provide accuracies of ±3°C at room temperature and ±4°C over the full -40°C to +125°C temperature range. Trimming and calibration of the LM50 at the wafer level assure low cost and high accuracy. The LM50's linear output, +500 mV offset, and factory calibration simplify circuitry required in a single supply environment where reading negative temperatures is required. Because the LM50's quiescent current is less than 130 µA, self-heating is limited to a very low 0.2°C in still air.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM50BIM3LFAST10195100026050002739175862
LM50BIM3XLFAST10195100026050002739175862
LM50C MDCLFAST10195100026050002739175862
LM50CIM3LFAST10195100026050002739175862
LM50CIM3XLFAST10195100026050002739175862

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.


More Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1984: Application Note 1984 LM57 Temperature Switch vs Thermistors 210
Kbytes		 28-Jul-09 Download

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[Information as of 8-Nov-2009]