LM34D ,Precision Fahrenheit Temperature SensorApplicationsTL/H/6685–3FIGURE1.BasicFahrenheitTemperatureSensora a( 5 to 300 F)§ §TL/H/6685–4FIGURE ..
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LM34DM ,Precision Fahrenheit Temperature SensorGeneral DescriptionLM34CA and LM34D are also available in the plastic TO-92The LM34 series are prec ..
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LM34D
Precision Fahrenheit Temperature Sensor
TL/H/6685
LM34/LM34A/LM34C/LM34CA/LM34D
Precision
Fahrenheit
Temperature
Sensors
December 1994
LM34/LM34A/LM34C/LM34CA/LM34D
Precision Fahrenheit Temperature Sensors
General Description
The LM34 seriesare precision integrated-circuit tempera-
ture sensors, whose outputvoltageis linearlyproportionalto
the Fahrenheit temperature.The LM34 thushasan advan-
tage over linear temperature sensors calibratedin degrees
Kelvin,asthe userisnot requiredto subtracta large con-
stant voltage fromits outputto obtain convenient Fahren-
heit scaling. The LM34 doesnot requireany external cali-
brationortrimmingto provide typical accuraciesof g(/2§Fat
room temperature and g1(/2§F overafull b50to a300§F
temperature range. Low costis assuredby trimming and
calibrationatthe wafer level.The LM34’slow output imped-
ance, linear output,and precise inherent calibration make
interfacingto readoutor control circuitry especially easy.It
canbe used with single power suppliesor with plus and
minussupplies.Asit draws only75 mAfromits supply,ithas
verylow self-heating,less than 0.2§Finstillair.The LM34is
ratedto operate overa b50§to a300§F temperature
range, whilethe LM34Cis ratedfora b40§to a230§F
range (0§F with improved accuracy). The LM34 seriesis
available packagedin hermetic TO-46 transistor packages,
whilethe LM34C, LM34CAand LM34Dare also availablein
the plastic TO-92 transistor package. The LM34Dis also
availableinan 8-lead surface mount small outline package.
The LM34isa complementtothe LM35 (Centigrade) tem-
perature sensor.
Features Calibrated directlyin degrees Fahrenheit Linear a10.0 mV/§F scale factor 1.0§F accuracy guaranteed(at a77§F) Ratedforfull b50§to a300§F range Suitablefor remote applications Low costdueto wafer-level trimming Operates from5to30 volts Less than90mA current drain Low self-heating, 0.18§Finstillair Nonlinearity only g0.5§F typical Low-impedance output, 0.4Xfor1mA load
Connection Diagrams
TO-46
MetalCanPackage*
TL/H/6685–1
*Caseisconnectedto negative pin(GND).
OrderNumbersLM34H, LM34AH,
LM34CH, LM34CAHorLM34DH
SeeNS Package Number H03H
TO-92
Plastic Package
TL/H/6685–2
OrderNumber LM34CZ,
LM34CAZor LM34DZ
SeeNS Package Number Z03A
SO-8
Small OutlineMolded Package
TL/H/6685–20
TopView
N.C.eNo Connection
Order Number LM34DM
See NSPackageNumberM08A
Typical Applications
TL/H/6685–3
FIGURE 1.BasicFahrenheit Temperature Sensor
(a5§to a300§F)
TL/H/6685–4
FIGURE2. Full-RangeFahrenheit Temperature SensorTRI-STATEÉ isaregistered trademarkof National SemiconductorCorporation.
C1995National SemiconductorCorporation RRD-B30M75/PrintedinU.S.A.
