LM135-LM235-LM335
Precision temperature sensors
Features
Directly calibrated in K 1C initial accuracy Operates from 450A to 5mA Less than 1 dynamic impedance TO-92 (Plastic package)
Description
The LM135, LM235, LM335 are precision temperature sensors which can be easily calibrated. They operate as a 2-terminal Zener and the breakdown voltage is directly proportional to the absolute temperature at 10mV/K. The circuit has a dynamic impedance of less than 1 and operates within a range of current from 450A to 5mA without alteration of its characteristics. Calibrated at +25C, the LM135, LM235, and LM335 have a typical error of less than 1C over a 100C temperature range. Unlike other sensors, the LM135, LM235, LM335 have a linear output. SO-8 (Plastic micropackage) Pin connections TO-92 (Bottom view)
v-
ADJ
v+
SO-8 (Top view)
V+
8
NC
7
NC
6
ADJ
5
NC
1
2
NC
NC
3
4
V-
February 2008
Rev 3
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Schematic diagram
LM135-LM235-LM335
1
Schematic diagram
Figure 1. Schematic diagram
2
Absolute maximum ratings
Table 1.
Symbol Current Reverse Forward Operating free-air temperature range(1) Continuous Intermittent Storage temperature range
Absolute maximum ratings (AMR)
Parameter LM135 LM235 LM335LM335A Unit
IR IF
15 10
mA
Toper
-55 to +150 -40 to +125 -40 to +100 +150 to +200 +125 to +150 +100 to +125 -65 to +150
C
Tstg
C
1. Tj 150C
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LM135-LM235-LM335
Temperature accuracy
3
Table 2.
Temperature accuracy
Temperature accuracy
Parameter LM135 - LM235 LM335A Min. Typ. Max. Min. LM335 Unit Typ. Max.
Operating output voltage Tcase = +25C, IR = 1mA Uncalibrated temperature error (IR = 1mA) Tcase = +25C Tmin Tcase Tmax Temperature error with 25C calibration Tmin Tcase Tmax., IR = 1mA LM135 - LM235 LM335 LM335A Calibrated error at extended temperature Tcase = Tmax (intermittent) Non-linearity (IR = 1mA) LM135 - LM235 LM335 LM335A
2.95
2.98 1 2
3.01 3 5
2.92
2.98 4 5
3.04 6 9
V C
0.5 0.5 2 0.3 0.3
1.5 1 1 2 1 0.3 1.5 1.5 2
C
C C
4
Table 3.
Electrical characteristics
Electrical characteristics
LM135 - LM235 Parameter Min. Typ. 2.5 0.5 +10 80 10 1 0.2 Max. 10 Min. Typ. 3 0.6 +10 80 10 1 0.2 Max. 14 mV mV/C LM335-LM335A Unit
Operating output voltage change with current 450A IR 5mA at constant temperature Dynamic impedance (IR = 1mA) Output voltage temperature drift Time constant Still air Air 0.5m/s Stirred oil Time stability (Tcase = +125C)
s
C/kh
Note:
Accuracy measurements are made in a well-stirred oil bath. For other conditions, selfheating must be considered
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Electrical characteristics
LM135-LM235-LM335
Figure 2. Reverse voltage change (mV)
Reverse voltage change
Figure 3.
Calibrated error
Calibrated error (C)
Reverse current (mA) Figure 4. Reverse characteristics Figure 5.
Temperature (C) Response time
Reverse current (mA)
Reverse voltage (V) Figure 6. Dynamic impedance (Ohm) Dynamic impedance Figure 7.
Voltage swing (V)
Time (s) Noise voltage
Noise (nV/ z) H
Frequency (Hz)
Frequency (Hz)
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LM135-LM235-LM335
Electrical characteristics
Figure 8. Thermal resistance (C/W)
Thermal resistance junction to air
Figure 9.
Thermal time constant
Time constant (s)
Air velocity (m/s) Figure 10. Thermal response in still air
Air velocity (m/s) Figure 11. Thermal response in stirred oil bath
Percent of final value (%)
Time (min) Figure 12. Forward characteristics
Percent of final value (%)
Time (s)
Forward voltage (V)
Forward current (mA)
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Application information
LM135-LM235-LM335
5
Application information
There is an easy method of calibrating the device for higher accuracies (see Typical applications). The single point calibration works because the output of the LM135, LM235, LM335 is proportional to the absolute temperature with the extrapolated output of sensor going to 0V at 0K (-273.15C). Errors in output voltage versus temperature are only slope. Thus a calibration of the slope at one temperature corrects errors at all temperatures. The circuit output (calibrated or not) is given by the equation: VOT + VOTO x --T--To
where T is the unknown temperature and To is the reference temperature (in K). Nominally, the output is calibrated at 10mV/K. Precautions should be taken to ensure good sensing accuracy. As in the case of all temperatures sensors, self-heating can decrease accuracy. The LM135, LM235, and LM335 should operate with a low current but sufficient to drive the sensor and its calibration circuit to their maximum operating temperature. If the sensor is used in surroundings where the thermal resistance is constant, the errors due to self-heating can be externally calibrated. This is possible if the circuit is biased with a temperature stable current. Heating will then be proportional to Zener voltage and therefore temperature. In this way, the error due to self-heating is proportional to the absolute temperature as scale factor errors.
Typical applications
Figure 13. Basic temperature sensor Figure 14. Wide operating supply
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LM135-LM235-LM335
Application information
Figure 15. Calibrated sensor
Figure 16. Average temperature sensing
* Calibrated for 2.982V at 25C Figure 17. Isolated temperature sensor
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Application information Figure 18. Simple temperature controller
LM135-LM235-LM335
Figure 19. Centigrade thermometer
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LM135-LM235-LM335 Figure 20. Differential temperature sensor
Application information
Figure 21. Thermocouple cold junction compensation (compensation for grounded thermocouple)
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Application information Figure 22. Single power supply cold junction compensation
LM135-LM235-LM335
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LM135-LM235-LM335
Package information
6
Package information
In order to meet environmental requirements, STMicroelectronics offers these devices in ECOPACK packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an STMicroelectronics trademark. ECOPACK specifications are available at: www.st.com.
6.1
TO-92 tape & reel package information
Figure 23. TO-92 tape & reel package mechanical drawing
A1 P P T H
d
A
H1
H0
H
I1
W0
D0 F1 F2 P2 P0
W2 W1 W
L1
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Package information Table 4.
Dim. Min. AL A T d I1 P PO P2 F1/F2 h P W W0 W1 W2 H H0 H1 DO L1 3.8 4.0 15.5 16 2.5 11.7 12.4 5.95 2.4 -1 -1 17.5 5.7 8.5 12.7 12.7 6.35 2.5 0 0 18.0 6 9 13.7 13 6.75 2.8 1 1 19.0 6.3 9.75 0.5 20 16.5 25 4.2 11 0.150 0.610 0.45 0.098 0.461 0.488 0.234 0.094 -0.039 -0.039 0.689 0.224 0.335 Typ. Max. 5.0 5.0 4.0 Min.
LM135-LM235-LM335 TO-92 tape & reel package mechanical data
Millimeters Inches Typ. Max. 0.197 0.197 0.157 0.018
0.500 0.500 0.250 0.098 0 0 0.709 0.236 0.354
0.539 0.512 0.266 0.110 0.039 0.039 0.748 0.248 0.384 0.020 0.787
0.630
0.650 0.984
0.157
0.165 0.433
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LM135-LM235-LM335
Package information
6.2
TO-92 bulk package information
Figure 24. TO-92 bulk package mechanical drawing
Table 5.
Dim.
TO-92 bulk package mechanical data
Millimeters Min. Typ. 1.27 3.2 4.45 4.58 12.7 0.407 0.35 0.5 0.508 3.7 5.00 5.03 4.2 5.2 5.33 0.126 0.1752 0.1803 0.5 0.016 0.0138 0.0197 0.02 Max. Min. Inches Typ. 0.05 0.1457 0.1969 0.198 0.1654 0.2047 0.2098 Max.
L B O1 C K O2 a
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Package information
LM135-LM235-LM335
6.3
SO-8 package information
Figure 25. SO-8 package mechanical drawing
Table 6.
SO-8 package mechanical data
Dimensions
Ref. Min. A A1 A2 b c D H E1 e h L k ccc 0.25 0.40 1 0.10 1.25 0.28 0.17 4.80 5.80 3.80
Millimeters Typ. Max. 1.75 0.25 0.004 0.049 0.48 0.23 4.90 6.00 3.90 1.27 0.50 1.27 8 0.10 0.010 0.016 1 5.00 6.20 4.00 0.011 0.007 0.189 0.228 0.150 Min.
Inches Typ. Max. 0.069 0.010
0.019 0.010 0.193 0.236 0.154 0.050 0.020 0.050 8 0.004 0.197 0.244 0.157
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LM135-LM235-LM335
Ordering information
7
Ordering information
Table 7. Order codes
Temperature range -55C to +150C -40C to +125C -40C to +125C Package TO-92 SO-8 TO-92 Packing Bulk Tube or Tape & reel Bulk Marking LM135 LM235 LM235 LM335 -40C to +100C LM335AD LM335ADT LM335Z LM335AZ LM335AZT -40C to +100C TO-92 SO-8 Tube or Tape & reel LM335A Bulk Bulk or Tape & reel LM335 LM335A
Order code LM135Z LM235D LM235DT LM235Z LM335D LM335DT
8
Revision history
Table 8.
Date 6-May-2003 13-April-2004
Document revision history
Revision 1 2 Initial release. Corrected error in pinout diagram for TO-92 package on cover page (it is a bottom view, not a top view). Updated Section 6: Package information and Table 7: Order codes. Corrected typical values for uncalibrated temperature error in Table 2. Improved quality of electrical characteristics curves. Changes
11-Feb-2007
3
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LM135-LM235-LM335
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