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LM34C Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM34C
Description  Precision Fahrenheit Temperature Sensors
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com

 1 page
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December 1994
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
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 02 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
Calibrated directly in degrees Fahrenheit
Linear a100 mV F scale factor
10 F accuracy guaranteed (at a77 F)
Rated for full b50 to a300 F range
Suitable for remote applications
Low cost due to wafer-level trimming
Operates from 5 to 30 volts
Less than 90 mA current drain
Low self-heating 018 F in still air
Nonlinearity only g05 F typical
Low-impedance output 04X for 1 mA load
Connection Diagrams
Metal Can Package
TLH6685 – 1
Case is connected to negative pin (GND)
Order Numbers LM34H LM34AH
See NS Package Number H03H
Plastic Package
TLH6685 – 2
Order Number LM34CZ
See NS Package Number Z03A
Small Outline Molded Package
TLH6685 – 20
Top View
NC e No Connection
Order Number LM34DM
See NS Package Number M08A
Typical Applications
TLH6685 – 3
FIGURE 1 Basic Fahrenheit Temperature Sensor
(a5 to a300 F)
TLH6685 – 4
FIGURE 2 Full-Range Fahrenheit Temperature Sensor
is a registered trademark of National Semiconductor Corporation
C1995 National Semiconductor Corporation
RRD-B30M75Printed in U S A

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