Features
■ Directly calibrated in °K
■ 1°C initial accuracy
■ Operates from 450µA to 5mA
■ Less than 1Ω dynamic impedance
Description
LM135-LM235-LM335
Precision temperature sensors
TO-92
(Plastic package)
The LM135, LM235, LM335 are precision
temperature sensors which can be easily
calibrated. They operat e as a 2-terminal Zener
and the breakdown volta ge is directly proportional
to the absolute temperature at 10mV/°K.
The circuit has a dynamic impedance of le ss than
1Ω and operates within a range of current from
450µA to 5mA without alteration of its
characteristics.
Calibrated at +25°C, the LM135, LM235, and
LM335 have a typical error of less than 1°C o v er a
100°C temperature range. Unlike other sensors,
the LM135, LM235, LM335 have a linear output.
SO-8
(Plastic micropackage)
Pin connections
TO-92
(Bottom view)
v+
v-
ADJ
SO-8
(Top view)
V+ NC
8765
NC
ADJ
1234
NC
NC
-
NC
V
February 2008 Rev 3 1/16
www.st.com
16
Schematic diagram LM135-LM235-LM335
1 Schematic diagram
Figure 1. Schematic diagram
2 Absolute maximum ratings
Table 1. Absolute maximum ratings (AMR)
Symbol Parameter LM135 LM235
Current
I
R
I
F
T
oper
T
stg
1. Tj ≤ 150°C
2/16
Reverse
Forward
Operating free-air temperature
(1)
range
Continuous
Intermittent
Storage temperature range -65 to +150 °C
-55 to +150
+150 to +200
15
10
-40 to +125
+125 to +150
LM335-
LM335A
-40 to +100
+100 to +125
Unit
mA
°C
LM135-LM235-LM335 Temperature accuracy
3 Temperature accuracy
Table 2. Temperature accuracy
Parameter
Operating output voltage
= +25°C, IR = 1mA
T
case
Uncalibrated temperature error (I
T
= +25°C
case
≤ T
T
min
case
≤ T
max
= 1mA)
R
Temperature error with 25°C calibration
T
≤ T
≤ T
, IR = 1mA
min
case
max
.
LM135 - LM235
LM335
LM335A
Calibrated error at extended temperature
= T
T
case
Non-linearity (I
(intermittent)
max
= 1mA)
R
LM135 - LM235
LM335
LM335A
LM135 - LM235 -
LM335A
LM335
Unit
Min. Typ. Max. Min. Typ. Max.
2.95 2.98 3.01 2.92 2.98 3.04 V
1
2
0.5
3
5
1.5
4
5
6
9
12
0.5
1
22°C
0.3
1
0.3 1.5
0.3
1.5
°C
°C
°C
4 Electrical characteristics
Table 3. Electrical characteristics
Operating output voltage change with current
450µA ≤ I
Dynamic impedance (I
Output voltage temperature drift +10 +10 mV/°C
Time constant
Still air
Air 0.5m/s
Stirred oil
Time stability (T
Note: Accuracy measurements are made in a well-stirred oil bath. For other conditions, self-
LM135 - LM235 LM335-LM335A
Parameter
Min. Typ. Max. Min. Typ. Max.
≤ 5mA at constant temperature 2.5 10 3 14 mV
R
= 1mA) 0.5 0.6 Ω
R
80
10
1
= +125°C) 0.2 0.2 °C/kh
case
80
10
1
heating must be considered
Unit
s
3/16
Electrical characteristics LM135-LM235-LM335
Figure 2. Reverse voltage change Figure 3. Calibrated error
Calibrated error (°C)
Reverse voltage change (mV)
Reverse current (mA)
Temperature (°C)
Figure 4. Reverse characteristics Figure 5. Response time
Reverse current (mA)
Voltage swing (V)
Reverse voltage (V)
Time (µs)
Figure 6. Dynamic impedance Figure 7. Noise voltage
Noise (nV/√Hz)
Dynamic impedance (Ohm)
Frequency (Hz)
Frequency (Hz)
4/16
LM135-LM235-LM335 Electrical characteristics
Figure 8. Thermal resistance junction to air Figure 9. Thermal time constant
Time constant (s)
Thermal resistance (°C/W)
Air velocity (m/s)
Air velocity (m/s)
Figure 10. Thermal response in still air Figure 11. Thermal response in stirred oil bath
Percent of final value (%)
Time (min)
Figure 12. Forward characteristics
Forward voltage (V)
Forward current (mA)
Percent of final value (%)
Time (s)
5/16
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 0°K (-273.15°C). Errors in output voltage versus temperature are only slop e. 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:
V
+ VO
OT
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-h eating can decrease accuracy. The LM135, LM235, and LM33 5
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 erro rs
due to self-heating can be e xternally calibrated. This is possib le if the circui t 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.
TO
T
x
-------
To
Typical applications
Figure 13. Basic temperature sensor Figure 14. Wide operating supply
6/16
LM135-LM235-LM335 Application information
Figure 15. Calibrated sensor Figure 16. Average temperature sensing
* Calibrated for 2.982V at 25°C
Figure 17. Isolated temperature sensor
7/16
Application information LM135-LM235-LM335
Figure 18. Simple temperatur e controller
Figure 19. Centigrade thermometer
8/16
LM135-LM235-LM335 Application information
Figure 20. Differential temperature sensor
Figure 21. Thermocouple cold junction compensation (compensation for grounded
thermocouple)
9/16
Application information LM135-LM235-LM335
Figure 22. Single power supply cold junction compensation
10/16
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 marke d on the pa ckage and on the inner box label,
in compliance with JEDEC Standard JESD97. The maximum ratings related t o 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
d
H1
H
I1
H0
.
T
H
A
W2
L1
D0
P2
F1
P0
F2
W0
W1
W
11/16
Package information LM135-LM235-LM335
Table 4. TO-92 tape & reel package mechanical data
Millimeters Inches
Dim.
Min. Typ. Max. Min. Typ. Max.
AL 5.0 0.197
A 5.0 0.197
T 4.0 0.157
d 0.45 0.018
I1 2.5 0.098
P 11.7 12.7 13.7 0.461 0.500 0.539
PO 12.4 12.7 13 0.488 0.500 0.512
P2 5.95 6.35 6.75 0.234 0.250 0.266
F1/F2 2.4 2.5 2.8 0.094 0.098 0.110
Δh -1 0 1 -0.039 0 0.039
ΔP -1 0 1 -0.039 0 0.039
W 17.5 18.0 19.0 0.689 0.709 0.748
W0 5.7 6 6.3 0.224 0.236 0.248
W1 8.5 9 9.75 0.335 0.354 0.384
W2 0.5 0.020
H200.787
H0 15.5 16 16.5 0.610 0.630 0.650
H1 25 0.984
DO 3.8 4.0 4.2 0.150 0.157 0.165
L1 11 0.433
12/16
LM135-LM235-LM335 Package information
6.2 TO-92 bulk package information
Figure 24. TO-92 bulk package mechanical drawing
Table 5. TO-92 bulk package mechanical data
Millimeters Inches
Dim.
Min. Typ. Max. Min. Typ. Max.
L 1.27 0.05
B 3.2 3.7 4.2 0.126 0.1457 0.1654
O1 4.45 5.00 5.2 0.1752 0.1969 0.2047
C 4.58 5.03 5.33 0.1803 0.198 0.2098
K12.7 0.5
O2 0.407 0.5 0.508 0.016 0.0197 0.02
a 0.35 0.0138
13/16
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. Typ. Max. Min. Typ. Max.
A1.750.069
A1 0.10 0.25 0.004 0.010
A2 1.25 0.049
b 0.28 0.48 0.011 0.019
c 0.17 0.23 0.007 0.010
D 4.80 4.90 5.00 0.189 0.193 0.197
H 5.80 6.00 6.20 0.228 0.236 0.244
E1 3.80 3.90 4.00 0.150 0.154 0.157
e 1.27 0.050
h 0.25 0.50 0.010 0.020
L 0.40 1.27 0.016 0.050
k1°8°1°8°
ccc 0.10 0.004
Millimeters Inches
14/16
LM135-LM235-LM335 Ordering information
7 Ordering information
Table 7. Order codes
Order code
LM135Z -55°C to +150°C TO-92 Bulk LM135
LM235D
LM235DT
LM235Z -40°C to +125°C TO-92 Bulk LM235
LM335D
LM335DT
LM335AD
LM335ADT
LM335Z
LM335AZ
LM335AZT
Temperature
range
-40°C to +125°C SO-8
-40°C to +100°C SO-8
-40°C to +100°C TO-92
8 Revision history
Table 8. Document revision history
Package Packing Marking
Tube or
Tape & reel
Tube or
Tape & reel
Bulk LM335
Bulk or
Tape & reel
LM235
LM335
LM335A
LM335A
Date Revision Changes
6-May-2003 1 Initial release.
13-April-2004 2
11-Feb-2007 3
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.
15/16
LM135-LM235-LM335
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