LM135
LM23 5- LM335 ,A
PRECISION TEMPERATURESENSORS
.DIRECTLYCALIBRATEDIN
o
.1
C INITIALACCURACY
o
K
.OPERATESFROM450µATO5mA
.LESSTHAN 1Ω DYNAMICIMPEDANCE
DESC RIP TI ON
The LM135,LM235,LM335are precision temperature sensors which can be easilycalibrated. They
operate as a 2-terminalZener and the breakdown
voltageis directly proportionalto the absolute temperatureat 10mV/
pedance of less than 1Ω and operates within a
rangeof currentfrom 450µA to 5mAwithoutaltera-
tion of its characteristics. Calibrated at +25
LM135,LM235, LM335 have a typicalerrorof less
o
than 1
C over a 100oC temperaturerange. Unlike
other sensors,the LM135, LM235, LM335 have a
linearoutput.
o
K. Thecircuithas a dynamicim-
o
C, the
(PlasticPackage
(PlasticMicropackage)
ORDER CODES
Part num-
ber
LM135 –55
LM235 –40
LM335,A –40
Z
TO92
D
SO8
Temperature
Range
o
C, +150oC ••
o
C, +125oC ••
o
C, +100oC ••
Package
ZD
PI N CO NNECT IONS
October1997
TO92
(Bottomview)
+
V
ADJ
SO8
(Topview)
+
NC
V
-
V
135-01.EPS
8765
12
NC
NC
ADJ
NC
34
-
V
NC
135-02.EPS
LM135-LM235-LM335, A
SCHEMATI C DIAG RAM
V
1
3pF
10kΩ
12pF
50kΩ
49kΩ
2kΩ
1.1kΩ
49kΩ
15.6kΩ
600Ω
30kΩ
13.8kΩ
AD J
2
V
3
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter LM135 LM235 LM335,A Unit
Current
I
R
I
F
T
oper
T
stg
Note : 1. Tj≤ 150oC
Reverse
Forward
15
10
15
10
15
10
Operating Free-air Temperature Range - (note 1)
Continuous
Intermittent
–55 to +150
+150 to +200
–40 to +125
+125 to +150
–40 to +100
+100 to +125
Storage Temperature Range –65 to +150 –65 to +150 –65 to +150
mA
o
o
C
C
2/11
LM135-LM235-LM335, A
TEMPERATURE ACCURACY
LM135 - LM235
Parameter
LM335A
Min. Typ. Max. Min. Typ. Max.
Operating Output Voltage
= +25oC, IR= 1mA 2.95 2.98 3.01 2.92 2.98 3.04
T
case
Uncalibrated Temperature Error (I
= +25oC
T
case
≤ T
T
min.
case
≤ T
max.
= 1mA)
R
1
2
3
5
Temperature Error with 25oC Calibration
≤ T
T
min.
case
≤ T
= 1mA LM135 - LM235
max.,IR
LM335
LM335A
0.5
0.5
1.5
1
Calibrated Error at Extended Temperature
T
case=Tmax.
Non-linearity (I
(intermittent) 2 2
= 1mA) LM135 - LM235
R
LM335
LM335A
0.3
0.3
1
1.5
ELECTRICAL CHARACTERISTICS - (note 1)
Parameter
Operating output voltage change with current
450µA ≤ I
Dynamic Impedance (I
≤ 5mA at constant temperature 2.5 10 3 14
R
= 1mA) 0.5 0.6 Ω
R
Output Voltage Temperature Drift +10 +10 mV/
Time Constant Still Air
Air 0.5m/s
Stirred Oil
Time Stability (T
Note : 1. Accuracy measurements are made in a well-stirred oil bath. For other conditions, self heating must be considered.
= +125oC) 0.2 0.2
case
LM135 - LM235 LM335,A
Min. Typ. Max. Min. Typ. Max.
80
10
1
LM335
2
4
6
9
12
0.3 1.5
80
10
1
Unit
o
o
o
o
Unit
mV
o
C/kh
V
C
C
C
C
o
C
s
3/11
LM135-LM235-LM335, A
4/11
LM135-LM235-LM335, A
5/11
LM135-LM235-LM335, A
APPL ICATION HINTS
Thereisaneasymethodofcalibratingthedevicefor
higheraccuracies(see typicalapplications).
The singlepoint calibrationworks becausethe output of the LM135, LM235,LM335 is proportionalto
the absolutetemperaturewith the extrapolatedoutputofsensorgoingto0Vat0
in outputvoltageversustemperatureareonlyslope.
Thus a calibrationof the slopeat one temperature
correctserrorsat alltemperatures.
The output of the circuit (calibrated or not) can be
givenby theequation: V
whereT is the unknown temperatureand TOis the
referencetemperature(in
TYP ICAL APPLI C ATIONS
BASIC TEMPERATURE SENSOR
o
K( –273.15oC).Errors
= VOTOx
OT
o
K).
T
T
o
V
R1
o
Nominallytheoutput is calibratedat 10mV/
Precautionsshouldbe takento ensure goodsens-
ingaccuracy.Asinthecaseofalltemperaturessensors, self heating can decrease accuracy. The
LM135, LM235, LM335 should operate with a low
current,butsufficienttodrive thesensoranditscalibrationcircuit totheirmaximumoperatingtemperature.
If thesensorisusedinsurroundingswherethethermalresistaneisconstant,theerrorsduetoselfheating can be externallycalibrated. This is possible if
the circuit is biased with a temperaturestable current.Heatingwill then beproportionaltozenervoltageandthereforetemperature.Inthiswaytheerror
due to self heating is proportionalto the absolute
temperatureas scalefactor errors.
WIDEOPERATING SUPPLY
V
i
+5 to +40V
LM134, LM234
LM334
K.
LM135
LM235
LM335
CALIBRATED SENSOR
V
R1
LM135
LM235
LM335
* Calibrate for 2.982V at +25oC
Output
10mV/°K
Output
10mV/°K
10kΩ*
68Ω
LM135
LM235
LM335
AVERAGETEMPERATURE SENSING
+15V
6kΩ
Output
30mV/°K
LM135
LM235
LM335
Output
10mV/°K
6/11
ISOLATED TEMPERATURE SENSOR
+15V +15V
50kΩ
3kΩ
01.µF
1k
Ω
38
2
LM311
4
5
1
10k
6
7
Ω
510Ω
LM135
LM235
LM335
200pF
m=1
1N4148
27kΩ
10k
Ω
100kΩ
3
LF398
4
8
LM135-LM235-LM335, A
1N457
1
0.1µF
Ω
2k
5
6
7
Output
10mV/°K
-15V
SIMPLE TEMPERATURE CONTROLLER
+10V to +30V
2kΩ
Ω
10k
1N4568
10kΩ
4kΩ
Ω
5k
0.01µF
LM135
LM235
LM335
2
3
1N4148
5
LM311
1
-15V
6
10k
8
4
7
Ω
1000pF
Heater
BUV26
7/11
LM135-LM235-LM335, A
CENTIGRADE THERMOMETER
+15V
Ω
6k
1kΩ
+15V
+15V
2
7
12k
Ω
LM308
3
8.5kΩ
LM136
Ω
2k
* Adjust for 2.7315Vat
output of LM308
DIFFERENTIAL TEMPERATURE SENSOR
+15V
12k
Ω
12kΩ
6
8
4
LM135
LM235
10kΩ
{
Output
10mV/°C
LM335
*
100pF
200kΩ
8/11
LM135
LM235
LM335
20k
20kΩ
180k
Ω
2
3
Ω
+15V
LM308
4
-15V
7
6
8
Output
100mV/°C
100pF
50kΩ
THERMOCOUPLE COLDJUNCTION COMPENSATION
(compensationfor grounded thermocouple)
LM135-L M235- LM 335, A
Thermo-
couple
+15V
J
T
K
S
1N4568
LM135
LM235
4.7kΩ
R2
10
kΩ
R1
10k
200k
1%
1MΩ
1%
Ω
Ω
R3*
LM335
Thermocouple
12kΩ
71.5kΩ
1%
-15V
* Select R3 for proper thermocouple type
SINGLE POWER SUPPLY COLD JUNCTION COMPENSATION
R3
377Ω
308Ω
293Ω
45.8Ω
Adjustments : compensates for both sensor
and resistor tolerances.
1. Short 1N4568.
2. Adjust R1 for SEEBECK coefficient times
ambient temperature (in degrees K) across
R3.
3. Short LM135 and adjust R2 for voltage
across R3 corresponding to thermocouple
type.
J 14.32mV K 11.17mV
T 11.79mV S 1.768mV
Seebeck
Coefficient
o
52.3µV/
42.8µV/
40.8µV/
6.4µV/
C
o
C
o
C
o
C
+15V
10kΩ
Ω
200k
LM135
LM235
LM335
+15V
1N4568
* Select R3 and R4 for proper thermocouple
R2
10
kΩ
R1
10kΩ
200kΩ
R3*
1MΩ
R4*
Thermocouple
Output
Thermo-
couple
J
T
K
S
R3 R4
1.05kΩ
856Ω
816Ω
128Ω
Adjustments :
1. Adjust R1 for the voltage across R3 equal
to the SEEBECK coefficient times ambient
temperature in degrees Kelvin.
2. Adjust R2 for voltage across R4 corresponding to thermocouple.
J 14.32mV K 11.17mV
T 11.79mV S 1.768mV
365Ω
315Ω
300Ω
46.3Ω
Seebeck
Coefficient
o
52.3µV/
42.8µV/
40.8µV/
6.4µV/
C
o
C
o
C
o
C
9/11
LM135-L M235 -LM335 , A
PACKAG E MECHANI CAL DATA
8 PINS - PLASTIC MICROPACKAGE (SO)
Dimensions
Min. Typ. Max. Min. Typ. Max.
Millimeters Inches
A 1.75 0.069
a1 0.1 0.25 0.004 0.010
a2 1.65 0.065
a3 0.65 0.85 0.026 0.033
b 0.35 0.48 0.014 0.019
b1 0.19 0.25 0.007 0.010
C 0.25 0.5 0.010 0.020
c1 45
o
(typ.)
D 4.8 5.0 0.189 0.197
E 5.8 6.2 0.228 0.244
e 1.27 0.050
e3 3.81 0.150
F 3.8 4.0 0.150 0.157
L 0.4 1.27 0.016 0.050
M 0.6 0.024
S8
o
(max.)
PM-SO8.EPS
SO8.TBL
10/11
PACKAG E MECHANI CAL DATA
3 PINS - PLASTIC PACKAGE TO92
LM135-L M235- LM 335, A
Dimensions
Min. Typ. Max. Min. Typ. Max.
Millimeters Inches
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
K 12.7 0.5
O2 0.407 0.5 0.508 0.016 0.0197 0.02
a 0.35 0.0138
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Microelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which
may result from its use. No license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON
Microelectronics. Specification mentioned in this publication are subject to change without notice. This publication supersedes
and replaces all information previously supplied. SGS-THOMSON Microelectronics products are not authorized for use as critical
components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics.
PM-TO92.IMG
TO92TBL
1997 SGS-THOMSON Microelectronics – Printed in Italy – All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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ORDER CODE :
11/11
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