IC, TEMPERATURE SENSOR, ± 2°C, 3-SOT-23

 

LM50BIM3

Manufacturer Part NumberLM50BIM3
DescriptionIC, TEMPERATURE SENSOR, ± 2°C, 3-SOT-23
ManufacturerNational Semiconductor
LM50BIM3 datasheets

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Specifications of LM50BIM3

Ic Output TypeVoltageSensing Accuracy Range± 2°C
Supply Current130µASupply Voltage Range4.5V To 10V
Sensor Case StyleSOT-23No. Of Pins3
Termination TypeSMDTemperature Sensor FunctionTemp Sensor
Output TypeAnalogPackage TypeSOT-23
Operating Temperature (min)-25COperating Temperature (max)100C
Operating Temperature ClassificationCommercialOperating Supply Voltage (typ)5/9V
Operating Supply Voltage (max)10VFilter TerminalsSMD
Rohs CompliantNoDc0424
Lead Free Status / RoHS StatusContains lead / RoHS non-compliant  
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LM50
SOT-23 Single-Supply Centigrade Temperature Sensor
General Description
The LM50 is a precision integrated-circuit temperature sen-
sor 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 out-
put, +500 mV offset, and factory calibration simplify circuitry
required in a single supply environment where reading nega-
tive 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.
Connection Diagram
SOT-23
01203001
Top View
See NS Package Number mf03A
© 2006 National Semiconductor Corporation
Applications
n Computers
n Disk Drives
n Battery Management
n Automotive
n FAX Machines
n Printers
n Portable Medical Instruments
n HVAC
n Power Supply Modules
Features
n Calibrated directly in degree Celsius (Centigrade)
n Linear + 10.0 mV/˚C scale factor
±
2˚C accuracy guaranteed at +25˚C
n
n Specified for full −40˚ to +125˚C range
n Suitable for remote applications
n Low cost due to wafer-level trimming
n Operates from 4.5V to 10V
n Less than 130 µA current drain
n Low self-heating, less than 0.2˚C in still air
n Nonlinearity less than 0.8˚C over temp
n UL Recognized Component
Order
Number
LM50BIM3
LM50CIM3
LM50BIM3X
LM50CIM3X
DS012030
February 2006
Device
Supplied As
Top Mark
T5B
1000 Units on Tape
and Reel
T5C
1000 Units on Tape
and Reel
T5B
3000 Units on Tape
and Reel
T5C
3000 Units on Tape
and Reel
www.national.com

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LM50BIM3 Summary of contents

  • Page 1

    ... Less than 130 µA current drain n Low self-heating, less than 0.2˚C in still air n Nonlinearity less than 0.8˚C over temp n UL Recognized Component Order Number LM50BIM3 LM50CIM3 LM50BIM3X LM50CIM3X DS012030 February 2006 Device Supplied As Top Mark T5B 1000 Units on Tape ...

  • Page 2

    ... Typical Application FIGURE 1. Full-Range Centigrade Temperature Sensor (−40˚C to +125˚C) www.national.com 01203003 2 ...

  • Page 3

    ... Note 9: Quiescent current is defined in the circuit of Figure 1 . Note 10: For best long-term stability, any precision circuit will give best results if the unit is aged at a warm temperature, and/or temperature cycled for at least 46 hours before long-term life test begins. This is especially true when a small (Surface-Mount) part is wave-soldered; allow time for stress relaxation to occur. The majority of the drift will occur in the first 1000 hours at elevated temperatures ...

  • Page 4

    ... Typical Performance Characteristics circuit board as shown in Figure 2. Thermal Resistance Junction to Air Thermal Response in Still Air with Heat Sink (Figure 2) Start-Up Voltage vs Temperature www.national.com To generate these curves the LM50 was mounted to a printed Thermal Time Constant 01203021 01203023 Thermal Response in Still Air without a Heat Sink ...

  • Page 5

    ... Typical Performance Characteristics circuit board as shown in Figure 2. (Continued) Quiescent Current vs Temperature (Figure 1) Noise Voltage Start-Up Response To generate these curves the LM50 was mounted to a printed Accuracy vs Temperature 01203027 01203029 01203031 5 01203028 Supply Voltage vs Supply Current 01203030 www.national.com ...

  • Page 6

    ... This presumes that the ambient air temperature is almost the same as the surface temperature; if the air temperature were much higher or lower than the surface temperature, the actual temperature of the LM50 die would interme- diate temperature between the surface temperature and the air temperature. ...

  • Page 7

    ... Capacitive Loads (Continued) *R2 ≈ 2k with a typical 1300 ppm/˚C drift. 3.0 Typical Applications FIGURE 6. Centigrade Thermostat/Fan Controller FIGURE 7. Temperature To Digital Converter (Serial Output) (+125˚C Full Scale) FIGURE 5. Block Diagram 7 01203017 01203011 01203013 www.national.com ...

  • Page 8

    ... Typical Applications FIGURE 8. Temperature To Digital Converter (Parallel TRI-STATE Standard Data Bus to µP Interface) (125˚C Full Scale) FIGURE 9. LM50 With Voltage-To-Frequency Converter And Isolated Output www.national.com (Continued) (−40˚C to +125˚C; 100 Hz to 1750 Hz) 8 01203014 ® Outputs for 01203016 ...

  • Page 9

    ... Deutsch Tel: +49 (0) 69 9508 6208 English www.national.com Français Tel: +33 ( 8790 Order Number LM50BIM3, or LM50CIM3 NS Package Number mf03a 2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system affect its safety or effectiveness ...

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