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LM135/LM235/LM335, LM135A/LM235A/LM335A Precision Temperature Sensors
December 17, 2008
LM135/LM235/LM335, LM135A/LM235A/LM335A
Precision Temperature Sensors
General Description
The LM135 series are precision, easily-calibrated, integrated
circuit temperature sensors. Operating as a 2-terminal zener,
the LM135 has a breakdown voltage directly proportional to
absolute temperature at +10 mV/°K. With less than 1Ω dy-
namic impedance the device operates over a current range
of 400
μA
to 5 mA with virtually no change in performance.
When calibrated at 25°C the LM135 has typically less than 1°
C error over a 100°C temperature range. Unlike other sensors
the LM135 has a linear output.
Applications for the LM135 include almost any type of tem-
perature sensing over a −55°C to 150°C temperature range.
The low impedance and linear output make interfacing to
readout or control circuitry especially easy.
The LM135 operates over a −55°C to 150°C temperature
range while the LM235 operates over a −40°C to 125°C tem-
perature range. The LM335 operates from −40°C to 100°C.
The LM135/LM235/LM335 are available packaged in hermet-
ic TO-46 transistor packages while the LM335 is also avail-
able in plastic TO-92 packages.
Features
■
■
■
■
■
■
■
■
Directly calibrated in °Kelvin
1°C initial accuracy available
Operates from 400
μA
to 5 mA
Less than 1Ω dynamic impedance
Easily calibrated
Wide operating temperature range
200°C overrange
Low cost
Schematic Diagram
569801
© 2008 National Semiconductor Corporation
5698
www.national.com
LM135/LM235/LM335, LM135A/LM235A/LM335A
Absolute Maximum Ratings
(Note 4)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Reverse Current
Forward Current
Storage Temperature
8-Pin SOIC Package
TO-92 Package
TO-46 Package
15 mA
10 mA
−65°C to 150°C
−60°C to 150°C
−60°C to 180°C
Specified Operating Temp. Range
Continuous
LM135, LM135A −55°C to 150°C
LM235, LM235A −40°C to 125°C
LM335, LM335A −40°C to 100°C
Lead Temp. (Soldering, 10 seconds)
8-Pin SOIC Package:
Vapor Phase (60 seconds):
Infrared (15 seconds):
TO-92 Package:
TO-46 Package:
Intermittent
(Note 2)
150°C to 200°C
125°C to 150°C
100°C to 125°C
300°C
215°C
220°C
260°C
300°C
Temperature Accuracy
LM135/LM235, LM135A/LM235A
Parameter
Operating Output Voltage
Uncalibrated Temperature Error
Uncalibrated Temperature Error
Temperature Error with 25°C
Calibration
Calibrated Error at Extended
Temperatures
Non-Linearity
(Note 1)
Conditions
LM135A/LM235A
Min
Typ
2.98
0.5
1.3
0.3
2
0.3
0.5
Max
2.99
1
2.7
1
2.97
LM135/LM235
Min
2.95
Typ
2.98
1
2
0.5
2
0.3
1
Max
3.01
3
5
1.5
V
°C
°C
°C
°C
°C
Units
T
C
= 25°C, I
R
= 1 mA
T
C
= 25°C, I
R
= 1 mA
T
MIN
≤
T
C
≤
T
MAX
, I
R
= 1 mA
T
MIN
≤
T
C
≤
T
MAX
, I
R
= 1 mA
T
C
= T
MAX
(Intermittent)
I
R
= 1 mA
(Note 1)
Conditions
Temperature Accuracy
LM335, LM335A
Parameter
Operating Output Voltage
Uncalibrated Temperature Error
Uncalibrated Temperature Error
Temperature Error with 25°C
Calibration
Calibrated Error at Extended
Temperatures
Non-Linearity
LM335A
Min
Typ
2.98
1
2
0.5
2
0.3
1.5
Max
3.01
3
5
1
Min
2.92
2.95
LM335
Typ
2.98
2
4
1
2
0.3
1.5
Max
3.04
6
9
2
Units
V
°C
°C
°C
°C
°C
T
C
= 25°C, I
R
= 1 mA
T
C
= 25°C, I
R
= 1 mA
T
MIN
≤
T
C
≤
T
MAX
, I
R
= 1 mA
T
MIN
≤
T
C
≤
T
MAX
, I
R
= 1 mA
T
C
= T
MAX
(Intermittent)
I
R
= 1 mA
(Note 1)
Electrical Characteristics
Parameter
Operating Output Voltage
Change with Current
Dynamic Impedance
Output Voltage Temperature
Coefficient
Time Constant
Conditions
400 μA
≤
I
R
≤
5 mA
At Constant Temperature
I
R
= 1 mA
LM135/LM235
LM135A/LM235A
Min
Typ
2.5
0.5
+10
Max
10
Min
LM335
LM335A
Typ
3
0.6
+10
80
10
1
0.2
Max
14
Units
mV
Ω
mV/°C
sec
sec
sec
°C/khr
Still Air
100 ft/Min Air
Stirred Oil
T
C
= 125°C
2
80
10
1
0.2
Time Stability
www.national.com
LM135/LM235/LM335, LM135A/LM235A/LM335A
Note 1:
Accuracy measurements are made in a well-stirred oil bath. For other conditions, self heating must be considered.
Note 2:
Continuous operation at these temperatures for 10,000 hours for H package and 5,000 hours for Z package may decrease life expectancy of the device.
Thermal Resistance
θ
JA
(Junction to Ambient)
θ
JC
(Junction to Case)
Note 4:
Refer to RETS135H for military specifications.
8-Pin SOIC
165°C/W
N/A
TO-92
202°C/W
170°C/W
TO-46
400°C/W
N/A
Connection Diagrams
8-Pin SOIC
Surface Mount Package
TO-92
Plastic Package
TO-46
Metal Can Package*
569808
Bottom View
569825
569826
Top View
*Case is connected to negative pin
Bottom View
Ordering Information
Package
Part Number
LM335AM
8-Pin SOIC
LM335AMX
LM335M
LM335MX
TO-92
LM335AZ
LM335Z
LM135AH
LM135H
TO-46
LM235AH
LM235H
LM335AH
LM335H
Package Marking
LM335AM
LM335M
LM335AZ
LM335Z
LM135AH
LM135H
LM235AH
LM235H
LM335AH
LM335H
Transport Media
95 Units/Rail
2.5k Units Tape and Reel
95 Units/Rail
2.5k Units Tape and Reel
1800 Bag
1800 Bag
1000 Bag
1000 Bag
1000 Bag
1000 Bag
1000 Bag
1000 Bag
H03H
Z03Z
M08A
NSC Drawing
3
www.national.com
LM135/LM235/LM335, LM135A/LM235A/LM335A
Typical Performance Characteristics
Reverse Voltage Change
Calibrated Error
569827
569828
Reverse Characteristics
Response Time
569829
569830
Dynamic Impedance
Noise Voltage
569831
569832
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