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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-

1

•

Calibrated Directly in Degrees Fahrenheit

circuit temperature sensors, whose output voltage is

•

Linear 10.0 mV/°F Scale Factor

linearly proportional to the Fahrenheit temperature.

•

1.0°F Accuracy Assured (at 77°F)

The LM34 device has an advantage over linear

temperature sensors calibrated in degrees Kelvin,

•

Rated for Full

−50° to 300°F Range

because the user is not required to subtract a large

•

Suitable for Remote Applications

constant voltage from its output to obtain convenient

•

Low Cost Due to Wafer-Level Trimming

Fahrenheit scaling. The LM34 device does not

require any external calibration or trimming to provide

•

Operates From 5 to 30 Volts

typical accuracies of ±1/2°F at room temperature and

•

Less Than 90-

μA Current Drain

±1-1

⁄2°F over a full −50°F to 300°F temperature

•

Low Self-Heating, 0.18°F in Still Air

range. Lower cost is assured by trimming and

•

Nonlinearity Only ±0.5°F Typical

calibration at the wafer level. The low output

impedance,

linear

output,

and

precise

inherent

•

Low-Impedance Output, 0.4

Ω for 1-mA Load

calibration of the LM34 device makes interfacing to

readout or control circuitry especially easy. It can be

2 Applications

used with single power supplies or with plus and

•

Power Supplies

minus supplies. Because the LM34 device draws only

75 µA from its supply, the device has very low self-

•

Battery Management

heating, less than 0.2°F in still air.

•

HVAC

The LM34 device is rated to operate over a

−50°F to

•

Appliances

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

Full-Range Fahrenheit Temperature Sensor

300°F)

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.