LM45B National Semiconductor, LM45B Datasheet

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LM45B

Manufacturer Part Number
LM45B
Description
SOT-23 Precision Centigrade Temperature Sensors
Manufacturer
National Semiconductor
Datasheet

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C 1995 National Semiconductor Corporation
LM45B LM45C
SOT-23 Precision Centigrade Temperature Sensors
General Description
The LM45 series are precision integrated-circuit tempera-
ture sensors whose output voltage is linearly proportional to
the Celsius (Centigrade) temperature The LM45 does not
require any external calibration or trimming to provide accu-
racies of
b
trimming and calibration at the wafer level The LM45’s low
output impedance linear output and precise inherent cali-
bration make interfacing to readout or control circuitry espe-
cially easy It can be used with a single power supply or with
plus and minus supplies As it draws only 120
supply it has very low self-heating less than 0 2 C in still
air The LM45 is rated to operate over a
temperature range
Applications
Y
Y
Y
Connection Diagram
Typical Applications
20 to
Battery Management
FAX Machines
Printers
FIGURE 1 Basic Centigrade Temperature
a
g
100 C temperature range Low cost is assured by
2 C at room temperature and
(JEDEC Registration TO-236AB)
See NS Package Number M03B
Sensor (
a
Top View
SOT-23
2 5 C to
TL H 11754
a
100 C)
b
g
20 to
3 C over a full
TL H 11754 – 1
TL H 11754 – 3
A from its
a
100 C
Y
Y
Y
Y
Y
Y
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
LM45BIM3
LM45BIM3X
LM45CIM3
LM45CIM3X
Portable Medical Instruments
HVAC
Power Supply Modules
Disk Drives
Computers
Automotive
Calibrated directly in
Linear
Rated for full
Suitable for remote applications
Low cost due to wafer-level trimming
Operates from 4 0V to 10V
Less than 120 A current drain
Low self-heating 0 20 C in still air
Nonlinearity only
Low impedance output 20
g
Number
3 C accuracy guaranteed
Order
Choose R
V
V
Temperature Sensor (
OUT
OUT
a
e
e a
e a
e b
FIGURE 2 Full-Range Centigrade
10 0 mV C scale factor
(10 mV C
1
250 mV at
200 mV at
1 000 mV at
b
Marking
e b
SOT-23
Device
20 to
T4B
T4B
T4C
T4C
g
V
0 8 C max over temp
S
c
50 A
b
a
Celsius (Centigrade)
a
Temp C)
a
20 C
25 C
100 C range
250 Units on Tape and Reel
3000 Units on Tape and Reel
250 Units on Tape and Reel
3000 Units on Tape and Reel
100 C
b
for 1 mA load
20 C to
Supplied As
RRD-B30M75 Printed in U S A
a
100 C)
TL H 11754 – 4
May 1995

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LM45B Summary of contents

Page 1

... LM45B LM45C SOT-23 Precision Centigrade Temperature Sensors General Description The LM45 series are precision integrated-circuit tempera- ture sensors whose output voltage is linearly proportional to the Celsius (Centigrade) temperature The LM45 does not require any external calibration or trimming to provide accu- racies room temperature and ...

Page 2

... Machine Model 150 C a Operating Ratings Specified Temperature Range (Note 4) 215 C LM45B LM45C 220 C Operating Temperature Range LM45B LM45C Supply Voltage Range ( Unless otherwise noted these specifications apply for MAX all other limits T ...

Page 3

Typical Performance Characteristics To generate these curves the LM45 was mounted to a printed circuit board as shown in Figure 3 Thermal Resistance Junction to Air Thermal Response in Stirred Oil Bath with Heat Sink Quiescent Current vs Temperature (In ...

Page 4

Applications The LM45 can be applied easily in the same way as other integrated-circuit temperature sensors It can be glued or cemented to a surface and its temperature will be within about the surface temperature This ...

Page 5

Typical Applications (Continued) FIGURE 7 4-to-20 mA Current Source ( 11754– 16 FIGURE 9 Centigrade Thermometer (Analog Meter) FIGURE 11 Temperature To Digital Converter (Serial Output 11754 – 14 100 C) a FIGURE ...

Page 6

Typical Applications (Continued) FIGURE 12 Temperature To Digital Converter (Parallel TRI-STATE Outputs for Standard Data Bus to P Interface) (128 C Full Scale film resistor e -Trim R for V 3 075V -Trim R ...

Page 7

Typical Applications (Continued) FIGURE 14 LM45 With Voltage-To-Frequency Converter And Isolated Output Block Diagram ( 100 1000 Hz 11754 – 11754 – 22 ...

Page 8

... Physical Dimensions inches (millimeters) SOT-23 Molded Small Outline Transistor Package (M3) Order Number LM45BIM3 LM45BIM3X LM45CIM3 or LM45CIM3X LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF NATIONAL ...

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