LM34C Datasheet, PDF (1/10 Pages) National Semiconductor (TI) – Precision Fahrenheit Temperature Sensors

December 1994
LM34 LM34A LM34C LM34CA LM34D
Precision Fahrenheit Temperature Sensors
General Description
The LM34 series are precision integrated-circuit tempera-
ture sensors whose output voltage is linearly proportional to
the Fahrenheit temperature The LM34 thus has an advan-
tage over linear temperature sensors calibrated in degrees
Kelvin as the user is not required to subtract a large con-
stant voltage from its output to obtain convenient Fahren-
heit scaling The LM34 does not require any external cali-
bration or trimming to provide typical accuracies of g F at
room temperature and g1 F over a full b50 to a300 F
temperature range Low cost is assured by trimming and
calibration at the wafer level The LM34’s low output imped-
ance linear output and precise inherent calibration make
interfacing to readout or control circuitry especially easy It
can be used with single power supplies or with plus and
minus supplies As it draws only 75 mA from its supply it has
very low self-heating less than 0 2 F in still air The LM34 is
rated to operate over a b50 to a300 F temperature
range while the LM34C is rated for a b40 to a230 F
range (0 F with improved accuracy) The LM34 series is
available packaged in hermetic TO-46 transistor packages
while the LM34C LM34CA and LM34D are also available in
the plastic TO-92 transistor package The LM34D is also
available in an 8-lead surface mount small outline package
The LM34 is a complement to the LM35 (Centigrade) tem-
perature sensor
Features
Y _{Calibrated directly in degrees Fahrenheit}
Y _Linear a_{10 0 mV F scale factor}
Y _{1 0 F accuracy guaranteed (at} a_{77 F)}
Y _{Rated for full} b_{50 to} a_{300 F range}
Y _{Suitable for remote applications}
Y _{Low cost due to wafer-level trimming}
Y _{Operates from 5 to 30 volts}
Y _{Less than 90 mA current drain}
Y _{Low self-heating 0 18 F in still air}
Y _{Nonlinearity only} g_{0 5 F typical}
Y _{Low-impedance output 0 4X for 1 mA load}
Connection Diagrams
TO-46
Metal Can Package
TO-92
Plastic Package
SO-8
Small Outline Molded Package
TL H 6685–1
Case is connected to negative pin (GND)
Order Numbers LM34H LM34AH
LM34CH LM34CAH or LM34DH
See NS Package Number H03H
Typical Applications
TL H 6685 – 2
Order Number LM34CZ
LM34CAZ or LM34DZ
See NS Package Number Z03A
TL H 6685 – 20
Top View
N C e No Connection
Order Number LM34DM
See NS Package Number M08A
TL H 6685 – 3
FIGURE 1 Basic Fahrenheit Temperature Sensor
(a5 to a300 F)
TRI-STATE is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL H 6685
TL H 6685 – 4
FIGURE 2 Full-Range Fahrenheit Temperature Sensor
RRD-B30M75 Printed in U S A