LM135-LM235-LM335
Precision temperature sensors
Features
■
■
■
■
Directly calibrated in °K
1°C initial accuracy
Operates from 450µA to 5mA
Less than 1Ω 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
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 over 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-
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
1/16
www.st.com
16
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
LM335-
LM335A
Unit
I
R
I
F
15
10
mA
T
oper
-55 to +150 -40 to +125 -40 to +100
+150 to +200 +125 to +150 +100 to +125
-65 to +150
°C
T
stg
°C
1. T
j
≤
150°C
2/16
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
T
case
= +25°C, I
R
= 1mA
Uncalibrated temperature error (I
R
= 1mA)
T
case
= +25°C
T
min
≤
T
case
≤
T
max
Temperature error with 25°C calibration
T
min
≤
T
case
≤
T
max
.
, I
R
= 1mA
LM135 - LM235
LM335
LM335A
Calibrated error at extended temperature
T
case
= T
max
(intermittent)
Non-linearity (I
R
= 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
Ω
mV/°C
LM335-LM335A
Unit
Operating output voltage change with current
450µA
≤
I
R
≤
5mA at constant temperature
Dynamic impedance (I
R
= 1mA)
Output voltage temperature drift
Time constant
Still air
Air 0.5m/s
Stirred oil
Time stability (T
case
= +125°C)
s
°C/kh
Note:
Accuracy measurements are made in a well-stirred oil bath. For other conditions, self-
heating must be considered
3/16
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 (µs)
Noise voltage
Noise (nV/
√
Hz)
Frequency (Hz)
Frequency (Hz)
4/16
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)
5/16
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