Details, datasheet, quote on part number: LM34D
CategorySensors => Temperature Sensors
DescriptionPrecision Farenheit Temperature Sensor
CompanyNational Semiconductor Corporation
DatasheetDownload LM34D datasheet
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Features, Applications

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 1/2F at room temperature and 11/2F over a full to +300F 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 A from its supply, it has very low self-heating, less than 0.2F in still air. The LM34 is rated to operate over to +300F temperature range, while the LM34C is rated for to +230F range (0F 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 an 8-lead surface mount small outline package. The is a complement to the LM35 (Centigrade) temperature sensor.


Calibrated directly in degrees Fahrenheit Linear +10.0 mV/F scale factor 1.0F accuracy guaranteed (at +77F) Rated for full to +300F range Suitable for remote applications Low cost due to wafer-level trimming Operates from to 30 volts Less than 90 A current drain Low self-heating, 0.18F in still air Nonlinearity only 0.5F typical Low-impedance output, 0.4 for 1 mA load

TO-46 Metal Can Package (Note 1) TO-92 Plastic Package SO-8 Small Outline Molded Package
Typical Applications

If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Output Voltage Output Current Storage Temperature, TO-46 Package TO-92 Package SO-8 Package ESD Susceptibility (Note 12) Lead Temp. +150C 800V

TO-46 Package (Soldering, 10 seconds) TO-92 Package (Soldering, 10 seconds) SO Package (Note 13) Vapor Phase (60 seconds) Infrared (15 seconds) Specified Operating Temp. Range (Note LM34CA LM34D

LM34A Parameter Conditions Typical Accuracy (Note TA = TMAX TA = TMIN Nonlinearity (Note 9) Sensor Gain (Average Slope) Load Regulation (Note 4) Line Regulation (Note 4) Quiescent Current (Note = +77F TMIN TA TMAX = +30V Change of Quiescent Current (Note 4) Temperature Coefficient of Quiescent Current Minimum Temperature for Rated Accuracy Long-Term Stability In circuit of Figure Tj = TMAX for 1000 hours VS 30V TMIN TA TMAX TMIN TA TMAX Tested Limit (Note 5) Design Limit (Note 6) Typical LM34CA Tested Limit (Note 5) Design Limit (Note 6) F Units (Max)

Note 2: Unless otherwise noted, these specifications apply: + 300F for the LM34 and Tj +230F for the LM34C and LM34CA; and + 212F for the = +5 Vdc and ILOAD A in the circuit of Figure 2; +6 Vdc for LM34 and LM34A for Tj 300F. These specifications also apply from +5F to TMAX in the circuit of Figure 1. Note 3: Thermal resistance of the TO-46 package is 720F/W junction to ambient and 43F/W junction to case. Thermal resistance of the TO-92 package is 324F/W junction to ambient. Thermal resistance of the small outline molded package is 400F/W junction to ambient. For additional thermal resistance information see table in the Typical Applications section. Note 4: Regulation is measured at constant junction temperature using pulse testing with a low duty cycle. Changes in output due to heating effects can be computed by multiplying the internal dissipation by the thermal resistance. Note 5: Tested limits are guaranteed and 100% tested in production. Note 6: Design limits are guaranteed (but not 100% production tested) over the indicated temperature and supply voltage ranges. These limits are not used to calculate outgoing quality levels. Note 7: Specification in BOLDFACE TYPE apply over the full rated temperature range.


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