LM34_16 Datasheet, PDF (1/27 Pages) Texas Instruments – Precision Fahrenheit Temperature Sensors

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LM34
SNIS161D – MARCH 2000 – REVISED JANUARY 2016
LM34 Precision Fahrenheit Temperature Sensors
1 Features
•1 Calibrated Directly in Degrees Fahrenheit
• Linear 10.0 mV/°F Scale Factor
• 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
• Power Supplies
• Battery Management
• HVAC
• Appliances
3 Description
The LM34 series devices are precision integrated-
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.
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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
SOIC (8)
4.90 mm × 3.91 mm
LM34
TO-92 (3)
4.30 mm × 4.30 mm
TO-46 (3)
4.699 mm × 4.699 mm
(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
1
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.