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LM34 -
Precision Fahrenheit Temperature Sensor
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Features
| • | Calibrated directly in degrees Fahrenheit |
| • | Linear +10.0 mV/°F scale factor |
| • | 1.0°F accuracy guaranteed (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, 0.4Ohm for 1 mA load |
General Description
The LM34 series are precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Fahrenheit temperature. More...
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Typical Application
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Parametric Table
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Parametric Table
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Typical Performance
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Also Recommended
| LM94021 | 1.5V Supply, Celsius,4 Selectable Gains |
| LM94022 | 1.5V Supply, Celsius,4 Selectable Gains |
Additional Resources
Application Notes (see below)
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Datasheet
RoHS Compliance Information
| Size in Kbytes | Date |
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| LM34 Precision Fahrenheit Temperature Sensors |
251 Kbytes |
30-Nov-00 |
Download |
LM34 Precision Fahrenheit Temperature Sensors (Japanese)
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186 Kbytes |
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Package Availability, Models, Samples & Pricing
| Obsolete Part | Alternate Part or
Supplier | Source | Last Time Buy Date |
LM34CH
| LM34CAH
| NATIONAL SEMICONDUCTOR
| 01 Dec 2009
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General Description
The LM34 series are precision integrated-circuit temperature sensors, whose output voltage is linearly proportional to the Fahrenheit temperature. The LM34 thus has an advantage over linear temperature sensors calibrated in degrees Kelvin, as the user is not required to subtract a large constant voltage from its output to obtain convenient Fahrenheit scaling. The LM34 does not require any external calibration or trimming to provide typical accuracies of ±½°F at room temperature and ±1½°F over a full -50 to +300°F temperature range. Low cost is assured by trimming and calibration at the wafer level. The LM34's low output impedance, 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 µA 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 -50° to +300°F temperature range, while the LM34C is rated for a -40° to +230°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) temperature sensor.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
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LM34CAZ | SLM | 0 | 42786 | 0 | 0 | 3352500 | 2 | 951281028
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LM34CZ | SLM | 0 | 42786 | 0 | 0 | 3352500 | 2 | 951281028
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LM34DM | SLM | 0 | 42786 | 0 | 0 | 3352500 | 2 | 951281028
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LM34DMX | SLM | 0 | 42786 | 0 | 0 | 3352500 | 2 | 951281028
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LM34DZ | SLM | 0 | 42786 | 0 | 0 | 3352500 | 2 | 951281028
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Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR.
The Long Term Failure Rates were calculated
at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress
temperature of 150°C to an application temperature of 55°C.
For more information on Reliability Metrics, please click here.
Application Notes
| Title | Size in Kbytes |
Date |
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| AN-460: Application Note 460 LM34/LM35 Precision Monolithic Temperature Sensors |
306 Kbytes |
20-Sep-02 |
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AN-460 (Japanese): Application Note 460 LM34/LM35 Precision Monolithic Temperature Sensors
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322 Kbytes |
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More Application Notes
| Title | Size in Kbytes |
Date |
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| AN-1852: Application Note 1852 Designing With pH Electrodes |
190 Kbytes |
25-Sep-08 |
Download |
[Information as of 3-Jul-2009]
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