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LM34
SNIS161D –MARCH 2000–REVISED JANUARY 2016
LM34 Precision Fahrenheit Temperature Sensors
1 Features
3 Description
The LM34 series devices are precision integrated-
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Calibrated Directly in Degrees Fahrenheit
Linear 10.0 mV/°F Scale Factor
circuit temperature sensors, whose output voltage is
linearly proportional to the Fahrenheit temperature.
The LM34 device has an advantage over linear
temperature sensors calibrated in degrees Kelvin,
because the user is not required to subtract a large
constant voltage from its output to obtain convenient
Fahrenheit scaling. The LM34 device does not
require any external calibration or trimming to provide
typical accuracies of ±1/2°F at room temperature and
±1-1⁄2°F over a full −50°F to 300°F temperature
range. Lower cost is assured by trimming and
calibration at the wafer level. The low output
impedance, linear output, and precise inherent
calibration of the LM34 device makes interfacing to
readout or control circuitry especially easy. It can be
used with single power supplies or with plus and
minus supplies. Because the LM34 device draws only
75 µA from its supply, the device has very low self-
heating, less than 0.2°F in still air.
1.0°F Accuracy Assured (at 77°F)
Rated for Full −50° to 300°F Range
Suitable for Remote Applications
Low Cost Due to Wafer-Level Trimming
Operates From 5 to 30 Volts
Less Than 90-μA Current Drain
Low Self-Heating, 0.18°F in Still Air
Nonlinearity Only ±0.5°F Typical
Low-Impedance Output, 0.4 Ω for 1-mA Load
2 Applications
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Power Supplies
Battery Management
HVAC
The LM34 device is rated to operate over a −50°F to
300°F temperature range, while the LM34C is rated
for a −40°F to 230°F range (0°F with improved
accuracy). The LM34 devices are series is available
packaged in hermetic TO-46 transistor packages;
while the LM34C, LM34CA, and LM34D are available
in the plastic TO-92 transistor package. The LM34D
device is available in an 8-lead, surface-mount, small-
outline package. The LM34 device is a complement
to the LM35 device (Centigrade) temperature sensor.
Appliances
Device Information(1)
PART NUMBER
PACKAGE
BODY SIZE (NOM)
4.90 mm × 3.91 mm
4.30 mm × 4.30 mm
4.699 mm × 4.699 mm
SOIC (8)
LM34
TO-92 (3)
TO-46 (3)
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Basic Fahrenheit Temperature Sensor (5°F to
300°F)
Full-Range Fahrenheit Temperature Sensor
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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.