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National Semiconductor

LM34DZ Datasheet

Precision Fahrenheit Temperature Sensors


LM34DZ Datasheet Preview


July 1999
LM34
Precision Fahrenheit Temperature Sensors
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 con-
stant voltage from its output to obtain convenient Fahrenheit
scaling. The LM34 does not require any external calibration
or trimming to provide typical accuracies of ±12˚F at room
temperature and ±112˚F over a full −50 to +300˚F tempera-
ture 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 im-
proved 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 comple-
ment to the LM35 (Centigrade) temperature sensor.
Features
n Calibrated directly in degrees Fahrenheit
n Linear +10.0 mV/˚F scale factor
n 1.0˚F accuracy guaranteed (at +77˚F)
n Rated for full −50˚ to +300˚F range
n Suitable for remote applications
n Low cost due to wafer-level trimming
n Operates from 5 to 30 volts
n Less than 90 µA current drain
n Low self-heating, 0.18˚F in still air
n Nonlinearity only ±0.5˚F typical
n Low-impedance output, 0.4for 1 mA load
Connection Diagrams
TO-46
Metal Can Package
(Note 1)
TO-92
Plastic Package
SO-8
Small Outline
Molded Package
DS006685-1
Order Numbers LM34H,
LM34AH, LM34CH,
LM34CAH or LM34DH
See NS Package
Number H03H
Note 1: Case is connected to negative pin (GND).
DS006685-2
Order Number LM34CZ,
LM34CAZ or LM34DZ
See NS Package
Number Z03A
DS006685-20
N.C. = No Connection
Top View
Order Number LM34DM
See NS Package Number M08A
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 1999 National Semiconductor Corporation DS006685
www.national.com
Page 1

Typical Applications
DS006685-3
FIGURE 1. Basic Fahrenheit Temperature Sensor
(+5˚ to +300˚F)
DS006685-4
FIGURE 2. Full-Range Fahrenheit Temperature Sensor
www.national.com
2
Page 2

Absolute Maximum Ratings (Note 11)
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.
+35V to −0.2V
+6V to −1.0V
10 mA
−76˚F to +356˚F
−76˚F to +300˚F
−65˚C to +150˚C
800V
TO-46 Package
(Soldering, 10 seconds)
+300˚C
TO-92 Package
(Soldering, 10 seconds)
+260˚C
SO Package (Note 13)
Vapor Phase (60 seconds)
215˚C
Infrared (15 seconds)
220˚C
Specified Operating Temp. Range (Note 3)
LM34, LM34A
TMIN to TMAX
−50˚F to +300˚F
LM34C, LM34CA
−40˚F to +230˚F
LM34D
+32˚F to +212˚F
DC Electrical Characteristics (Notes 2, 7)
Parameter
Accuracy (Note 8)
Nonlinearity (Note 9)
Sensor Gain
(Average Slope)
Load Regulation
(Note 4)
Line Regulation
(Note 4)
Quiescent Current
(Note 10)
Change of Quiescent
Current (Note 4)
Temperature Coefficient
of Quiescent Current
Minimum Temperature
for Rated Accuracy
Long-Term Stability
Conditions
Typical
TA = +77˚F
TA = 0˚F
TA = TMAX
TA = TMIN
TMIN TA TMAX
TMIN TA TMAX
±0.4
±0.6
±0.8
±0.8
±0.35
+10.0
TA = +77˚F
TMIN TA TMAX
0 IL 1 mA
TA = +77˚F
5V VS 30V
VS = +5V, +77˚F
VS = +5V
VS = +30V, +77˚F
VS = +30V
4V VS 30V, +77˚F
5V VS 30V
±0.4
±0.5
±0.01
±0.02
75
131
76
132
+0.5
+1.0
+0.30
In circuit of Figure 1,
IL = 0
Tj = TMAX
for 1000 hours
+3.0
±0.16
LM34A
Tested
Limit
(Note 5)
±1.0
±2.0
±2.0
+9.9,
+10.1
±1.0
±0.05
90
92
2.0
Design
Limit Typical
(Note 6)
±0.4
±0.6
±0.8
±0.8
±0.7 ±0.30
+10.0
±3.0
±0.4
±0.5
±0.1
160
163
3.0
+0.5
±0.01
±0.02
75
116
76
117
0.5
1.0
+0.30
+5.0
+3.0
±0.16
LM34CA
Tested Design
Limit
Limit
(Note 5) (Note 6)
±1.0
±2.0
±2.0
±3.0
±0.6
+9.9,
+10.1
±1.0
±3.0
±0.05
90
92
2.0
±0.1
139
142
3.0
+0.5
+5.0
Units
(Max)
˚F
˚F
˚F
˚F
˚F
mV/˚F, min
mV/˚F, max
mV/mA
mV/mA
mV/V
mV/V
µA
µA
µA
µA
µA
µA
µA/˚F
˚F
˚F
Note 2: Unless otherwise noted, these specifications apply: −50˚F Tj + 300˚F for the LM34 and LM34A; −40˚F Tj +230˚F for the LM34C and LM34CA; and
+32˚F Tj + 212˚F for the LM34D. VS = +5 Vdc and ILOAD = 50 µA in the circuit of Figure 2; +6 Vdc for LM34 and LM34A for 230˚F Tj 300˚F. These specifications
also apply from +5˚F to TMAX in the circuit of Figure 1.
Note 3: Thermal resistance of the TO-46 package is 720˚F/W junction to ambient and 43˚F/W junction to case. Thermal resistance of the TO-92 package is 324˚F/W
junction to ambient. Thermal resistance of the small outline molded package is 400˚F/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 cal-
culate outgoing quality levels.
Note 7: Specification in BOLDFACE TYPE apply over the full rated temperature range.
3 www.national.com
Page 3

DC Electrical Characteristics (Notes 2, 7) (Continued)
Note 8: Accuracy is defined as the error between the output voltage and 10 mV/˚F times the device’s case temperature at specified conditions of voltage, current,
and temperature (expressed in ˚F).
Note 9: Nonlinearity is defined as the deviation of the output-voltage-versus-temperature curve from the best-fit straight line over the device’s rated temperature
range.
Note 10: Quiescent current is defined in the circuit of Figure 1.
Note 11: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. DC and AC electrical specifications do not apply when operating
the device beyond its rated operating conditions (Note 2).
Note 12: Human body model, 100 pF discharged through a 1.5 kresistor.
Note 13: See AN-450 “Surface Mounting Methods and Their Effect on Product Reliability” or the section titled “Surface Mount” found in a current National Semicon-
ductor Linear Data Book for other methods of soldering surface mount devices.
DC Electrical Characteristics (Notes 2, 7)
Parameter
Accuracy, LM34, LM34C
(Note 8)
Accuracy, LM34D
(Note 8)
Nonlinearity (Note 9)
Sensor Gain
(Average Slope)
Load Regulation
(Note 4)
Line Regulation
(Note 4)
Quiescent Current
(Note 10)
Change of Quiescent
Current (Note 4)
Temperature Coefficient
of Quiescent Current
Minimum Temperature
for Rated Accuracy
Long-Term Stability
Conditions
Typical
TA = +77˚F
TA = 0˚F
TA = TMAX
TA = TMIN
TA = +77˚F
TA = TMAX
TA = TMIN
TMIN TA TMAX
TMIN TA TMAX
±0.8
±1.0
±1.6
±1.6
±0.6
+10.0
TA = +77˚F
TMIN TA +150˚F
0 IL 1 mA
TA = +77˚F
5V VS 30V
VS = +5V, +77˚F
VS = +5V
VS = +30V, +77˚F
VS = +30V
4V VS 30V, +77˚F
5V VS 30V
±0.4
±0.5
±0.01
±0.02
75
131
76
132
+0.5
+1.0
+0.30
In circuit of Figure 1,
IL = 0
Tj = TMAX
for 1000 hours
+3.0
±0.16
LM34
Tested
Limit
(Note 5)
±2.0
±3.0
+9.8,
+10.2
±2.5
±0.1
100
103
3.0
LM34C, LM34D
Design
Tested Design
Limit Typical Limit
Limit
(Note 6)
(Note 5) (Note 6)
±0.8 ±2.0
±1.0
±3.0
±1.6
±3.0
±3.0
±1.6
±4.0
±1.2 ±3.0
±1.8
±4.0
±1.8
±4.0
±1.0
±0.4
±1.0
+10.0
+9.8,
+10.2
±0.4 ±2.5
±6.0
±0.5
±6.0
±0.2
176
181
5.0
+0.7
±0.01
±0.02
75
116
76
117
0.5
1.0
+0.30
±0.1
100
103
3.0
±0.2
154
159
5.0
+0.7
+5.0
+3.0
+5.0
±0.16
Units
(Max)
˚F
˚F
˚F
˚F
˚F
˚F
˚F
˚F
mV/˚F, min
mV/˚F, max
mV/mA
mV/mA
mV/V
mV/V
µA
µA
µA
µA
µA
µA
µA/˚F
˚F
˚F
www.national.com
4
Page 4
Part Number LM34DZ
Manufactur National Semiconductor
Description Precision Fahrenheit Temperature Sensors
Total Page 12 Pages
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