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■DIRECTLY CALIBRATED IN °K
■1°C INITI AL ACCURACY
■OPERATES FROM 450µA TO 5mA
■LESS THAN 1Ω DYNAMIC IMPEDANCE
DESCRIPTION
The LM135, LM235, LM335 are precision temper-
ature sensors which can be easily calibrated.
They operate as a 2-terminal Zener and the break-
down voltage is directly proportional to the abso-
lute temperature at 10mV /°K.
The circuit h as a dy nam ic impedance o f less than
1Ω and operates within a range of current from
450µA to 5mA without alteration of its characteris-
tics.
Calibrated at +25°C, the LM135, LM235, LM335
have a typical error of less than 1°C over a 100°C
temperature range. Unlike other sensors, the
LM135, LM235, LM 335 have a linear output.
ORDER CODE
Z = T O92 Plastic package - also available in Bulk (Z), Tape & Reel (ZT)
and Ammo Pack (AP)e
D = Small Outline Package (SO) - also available in Tape & Reel (DT)
PIN CONNECTIONS (top view)
Part Number Temperature
Range Package
ZD
LM135 -55°C, +150°C ••
LM235 -40°C, +125°C ••
LM335,A -40°C, +100°C ••
Z
TO92
(Plastic Package)
D
SO8
(Plastic Micro packa ge)
ADJ
v+ v-
TO92
(Top view) SO8
(Top view)
LM135
LM235 - LM335,A
PRECISION TEMPERATURE SENSORS
May 2003
LM135 - LM235 - LM335,A
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SCHEMATIC DIAGRAM
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter LM135 LM235 LM335,A Unit
IR
IF
Current
Reverse
Forward 15
10 mA
Toper Operating Free-air Temperature Range 1)
Continuous
Intermittent -55 to +150
+150 to +200 -40 to +125
+125 to +150 -40 to +100
+100 to +125 °C
TStg Storage Temperature Range -65 to +150 °C
1. Tj ≤ 150°C
LM135 - LM235 - LM335,A
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TEMPERATURE ACCURACY
ELECTRICAL CHARACTERISTICS - (note 1)
1. A ccu racy meas urem ents are ma de i n a well -st i rred oi l bat h. For other conditions, self heating must be considered
Parameter LM135 - LM235 -
LM335A LM335 Unit
Min. Typ. Max. Min. Typ. Max.
Operating Output Voltage
Tcase = +25°C, IR = 1mA 2.95 2.98 3.01 2.92 2.98 3.04 V
Uncalibrated Temperature Error (IR = 1mA)
Tcase = +25°C
Tmin. ≤ Tcase ≤ Tmax.
1
23
55
46
9°C
Temperature Error with 25°C Calibration
Tmin. ≤ Tcase ≤ Tmax., IR = 1mA LM135 - LM235
LM335
LM335A
0.5
0.5
1.5
112°C
Calibrated Error at Extended Temperature
Tcase = Tmax. (intermittent) 22°C
Non-linearity (IR = 1mA)
LM135 - LM235
LM335
LM335A
0.3
0.3
1
1.5 0.3 1.5 °C
Parameter LM135 - LM235 LM335,A Unit
Min. Typ. Max. Min. Typ. Max.
Operating output voltage change with current
450µA ≤ IR ≤ 5mA at constant temperature 2.5 10 3 14 mV
Dynamic Impedance (IR = 1mA) 0.5 0.6 Ω
Output Voltage Temperature Drift +10 +10 mV/°C
Time Constant Still Air
Air 0.5m/s
Stirred Oil
80
10
1
80
10
1s
Time Stability (Tcase = +125°C) 0.2 0.2 °C/kh
LM135 - LM235 - LM335,A
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LM135 - LM235 - LM335,A
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LM135 - LM235 - LM335,A
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APPLICATION HINTS
There is a n easy m etho d of ca librating the dev ice
for higher accuracies (see typical applications).
The single point calibration works because the
output of the LM135, LM235, LM335 is proportion-
al to the absolute temperature with the extrapolat-
ed output of sensor going to 0V at 0°K
(-273.15°C). Errors in output voltage versus tem-
perature are only slope. Thus a calibration of the
slope at one temperature corrects errors at all
temperatures.
The circuit output (calibrated or not) can be given
by the equation: VOT + VOTO x
where T is the unknown temperature and To is the
reference tempe rature (in °K).
Nomi nally the output is calibrate d at 10mV/°K.
Precautions should be taken to ensure good sens-
ing accuracy. As in the case of all temperatures
sensors, self heating can decrease accuracy. The
LM13 5, LM235, LM335 should operate with a low
current but sufficient to drive the sensor and its
calibration circuit to their maximum operating tem-
perature.
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
pos sible 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 absolu te temperature as scale factor errors.
T
To
-------
LM135 - LM235 - LM335,A
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LM135 - LM235 - LM335,A
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LM135 - LM235 - LM335,A
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LM135 - LM235 - LM335,A
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PACKAGE MECHANICAL DATA
DIM. mm. inch
MIN. TYP MAX. MIN. TYP. MAX.
A 1.35 1.75 0.053 0.069
A1 0.10 0.25 0.04 0.010
A2 1.10 1.65 0.043 0.065
B 0.33 0.51 0.013 0.020
C 0.19 0.25 0.007 0.010
D 4.80 5.00 0.189 0.197
E 3.80 4.00 0.150 0.157
e 1.27 0.050
H 5.80 6.20 0.228 0.244
h 0.25 0.50 0.010 0.020
L 0.40 1.27 0.016 0.050
k ˚ (max.)
ddd 0.1 0.04
SO-8 MECHANICAL DATA
0016023/C
8
LM135 - LM235 - LM335,A
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PACKAGE MECHANICAL DATA - TO92 TAPE AMMO PACK & TO92 TAPE & REEL
Packing information are available at: http://www.st.com/stonline/prodpres/packages/stdlin.htm
DIM. mm. inches
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
Dh -1 0 1 -0.039 0 0.039
DP -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
H 20 0.787
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
TO-92 MECHANICAL DATA
LM135 - LM235 - LM335,A
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PACKAGE MECHANICAL DATA - TO92 BULK
Packing information are available at: http://www.st.com/stonline/prodpres/packages/stdlin.htm
DIM. mm. mils
MIN. TYP MAX. MIN. TYP. MAX.
A 4.32 4.95 170.1 194.9
b 0.36 0.51 14.2 20.1
D 4.45 4.95 175.2 194.9
E 3.30 3.94 129.9 155.1
e 2.41 2.67 94.9 105.1
e1 1.14 1.40 44.9 55.1
L 12.7 15.49 500.0 609.8
R 2.16 2.41 85.0 94.9
S1 0.92 1.52 36.2 59.8
W 0.41 0.56 16.1 22.0
TO-92 MECHANICA DATA
0102782/C
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