LM45 SOT-23 Precision Centigrade Temperature Sensors
August 2005
LM45
SOT-23 Precision Centigrade Temperature Sensors
General Description
The LM45 series are precision integrated-circuit temperature
sensors, whose output voltage is linearly proportional to the
Celsius (Centigrade) temperature. The LM45 does not re-
quire any external calibration or trimming to provide accura-
cies of
±
2˚C at room temperature and
±
3˚C over a full −20 to
+100˚C temperature range. Low cost is assured by trimming
and calibration at the wafer level. The LM45’s low output
impedance, linear output, and precise inherent calibration
make interfacing to readout or control circuitry especially
easy. It can be used with a single power supply, or with plus
and minus supplies. As it draws only 120 µA from its supply,
it has very low self-heating, less than 0.2˚C in still air. The
LM45 is rated to operate over a −20˚ to +100˚C temperature
range.
Applications
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Battery Management
FAX Machines
Printers
Portable Medical Instruments
HVAC
Power Supply Modules
Disk Drives
Computers
Automotive
Features
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Calibrated directly in ˚ Celsius (Centigrade)
Linear + 10.0 mV/˚C scale factor
±
3˚C accuracy guaranteed
Rated for full −20˚ to +100˚C range
Suitable for remote applications
Low cost due to wafer-level trimming
Operates from 4.0V to 10V
Less than 120 µA current drain
Low self-heating, 0.20˚C in still air
Nonlinearity only
±
0.8˚C max over temp
Low impedance output, 20Ω for 1 mA load
Connection Diagram
SOT-23
01175401
Top View
See NS Package Number mf03a
Order
Number
LM45BIM3
LM45BIM3X
LM45CIM3
LM45CIM3X
Device
Top Mark
T4B
T4B
T4C
T4C
Supplied As
1000 Units on Tape and Reel
3000 Units on Tape and Reel
1000 Units on Tape and Reel
3000 Units on Tape and Reel
© 2005 National Semiconductor Corporation
DS011754
www.national.com
NSC [ NATIONAL SEMICONDUCTOR ]
