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LM45B
SOT-23 Precision Centigrade Temperature Sensor
TL/H/11754
LM45B/LM45C
SOT-23
Precision
Centigrade
Temperature
Sensors
May 1995
LM45B/LM45C
SOT-23 Precision Centigrade Temperature Sensors
General Description
The LM45 seriesare precision integrated-circuit tempera-
ture sensors, whose outputvoltageis linearlyproportionalto
the Celsius (Centigrade) temperature. The LM45 doesnot
requireany external calibrationor trimmingto provide accu-
raciesof g2§Cat room temperatureand g3§C overafull
b20to a100§C temperature range. Low costis assuredby
trimmingand calibrationatthe wafer level.The LM45’slow
output impedance, linear output, and precise inherent cali-
bration make interfacingto readoutor control circuitry espe-
ciallyeasy. Itcanbe usedwitha singlepowersupply,orwith
plusand minus supplies.Asit draws only 120mA fromits
supply,ithas verylow self-heating, less than 0.2§Cinstill
air.The LM45is ratedto operate overa b20§to a100§C
temperature range.
Applications Battery Management FAX Machines Printers Portable Medical Instruments HVAC Power Supply Modules Disk Drives Computers Automotive
Features Calibrated directlyin§ Celsius (Centigrade) Lineara 10.0 mV/§C scale factor g3§C accuracy guaranteed Ratedforfull b20§to a100§C range Suitablefor remote applications Low costdueto wafer-level trimming Operates from 4.0Vto 10V Less than 120mA current drain Low self-heating, 0.20§Cinstillair Nonlinearity only g0.8§C max over temp Low impedance output, 20Xfor1mA load
Connection Diagram
SOT-23
TL/H/11754–1
Top View
SeeNS PackageNumberM03B
(JEDEC Registration TO-236AB)
SOT-23
Order Device
Number Marking SuppliedAs
LM45BIM3 T4B 250Unitson Tapeand Reel
LM45BIM3X T4B 3000Unitson Tapeand Reel
LM45CIM3 T4C 250Unitson Tapeand Reel
LM45CIM3X T4C 3000Unitson Tapeand Reel
Typical Applications
TL/H/11754–3
FIGURE1. Basic Centigrade Temperature
Sensor (a2.5§Cto a100§C)
TL/H/11754–4ChooseR1 ebVS/50mA
VOUTe(10 mV/§Cc Temp§C)
VOUTea1,000mVat a100§C
ea250mVat a25§C
eb200mVat b20§C
FIGURE2. Full-Range Centigrade
Temperature Sensor(b20§Cto a100§C)
C1995National SemiconductorCorporation RRD-B30M75/PrintedinU.S.A.
