LM50B LM50C SOT-23 Single-Supply Centigrade Temperature Sensor
June 1996
LM50B LM50C
SOT-23 Single-Supply Centigrade Temperature Sensor
General Description
The LM50 is a precision integrated-circuit temperature sen-
sor that can sense a
b
40 C to
a
125 C temperature range
using a single positive supply The LM50鈥檚 output voltage is
linearly proportional to Celsius (Centigrade) temperature
(
a
10 mV C) and has a DC offset of
a
500 mV The offset
allows reading negative temperatures without the need for a
negative supply The ideal output voltage of the LM50
ranges from
a
100 mV to
a
1 75V for a
b
40 C to
a
125 C
temperature range The LM50 does not require any external
calibration or trimming to provide accuracies of
g
3 C at
room temperature and
g
4 C over the full
b
40 C to
a
125 C temperature range Trimming and calibration of the
LM50 at the wafer level assure low cost and high accuracy
The LM50鈥檚 linear output
a
500 mV offset and factory cali-
bration simplify circuitry required in a single supply environ-
ment where reading negative temperatures is required Be-
cause the LM50鈥檚 quiescent current is less than 130
mA
self-heating is limited to a very low 0 2 C in still air
Y
Y
Y
Y
Y
Y
Y
Battery Management
Automotive
FAX Machines
Printers
Portable Medical Instruments
HVAC
Power Supply Modules
Features
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
Applications
Y
Y
Calibrated directly in Celsius (Centigrade)
Linear
a
10 0 mV C scale factor
g
2 C accuracy guaranteed at
a
25 C
Specified for full
b
40 to
a
125 C range
Suitable for remote applications
Low cost due to wafer-level trimming
Operates from 4 5V to 10V
Less than 130
mA
current drain
Low self-heating less than 0 2 C in still air
Nonlinearity less than 0 8 C over temp
Computers
Disk Drives
Connection Diagram
SOT-23
Order
Number
LM50BIM3
LM50CIM3
LM50BIM3X
TL H 12030 鈥?
SOT-23
Device Marking
T5B
T5C
T5B
T5C
Supplied As
250 Units on Tape and Reel
250 Units on Tape and Reel
3000 Units on Tape and Reel
3000 Units on Tape and Reel
Top View
See NS Package Number M03B
(JEDEC Registration TO-236AB)
LM50CIM3X
Typical Application
TL H 12030 鈥?3
FIGURE 1 Full-Range Centigrade Temperature Sensor (
b
40 C to
a
125 C)
C
1996 National Semiconductor Corporation
TL H 12030
RRD-B30M76 Printed in U S A
http
www national com
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