Low Voltage Temperature Sensors
TMP35/TMP36/TMP37
+V
S
(2.7V TO 5.5V)
V
OUT
SHUTDOWN
TMP35/
TMP36/
TMP37
00337-001
1
2
3
5
4
TOP VIEW
(Not to Scale)
NC = NO CONNECT
V
OUT
SHUT
DOWN
GND
NC
+V
S
00337-002
1
2
3
4
8
7
6
5
TOP VIEW
(Not to Scale)
NC = NO CONNECT
V
OUT
SHUTDOWN
NC
NC
+V
S
NC
NC
GND
00337-003
1 3
2
BOTTOM VIEW
(Not to Scale)
PIN 1, +VS; PIN 2, V
OUT
; PIN 3, GND
00337-004
Data Sheet
FEATURES
Low voltage operation (2.7 V to 5.5 V)
Calibrated directly in °C
10 mV/°C scale factor (20 mV/°C on TMP37)
±2°C accuracy over temperature (typ)
±0.5°C linearity (typ)
Stable with large capacitive loads
Specified −40°C to +125°C, operation to +150°C
Less than 50 µA quiescent current
Shutdown current 0.5 µA max
Low self-heating
Qualified for automotive applications
APPLICATIONS
Environmental control systems
Thermal protection
Industrial process control
Fire alarms
Power system monitors
CPU thermal management
FUNCTIONAL BLOCK DIAGRAM
Figure 1.
PIN CONFIGURATIONS
Figure 2. RJ-5 (SOT-23)
GENERAL DESCRIPTION
The TMP35/TMP36/TMP37 are low voltage, precision centigrade temperature sensors. They provide a voltage output that
is linearly proportional to the Celsius (centigrade) temperature.
The TMP35/TMP36/TMP37 do not require any external
calibration to provide typical accuracies of ±1°C at +25°C
and ±2°C over the −40°C to +125°C temperature range.
The low output impedance of the TMP35/TMP36/TMP37 and
its linear output and precise calibration simplify interfacing to
temperature control circuitry and ADCs. All three devices are
intended for single-supply operation from 2.7 V to 5.5 V maximum. The supply current runs well below 50 µA, providing
very low self-heating—less than 0.1°C in still air. In addition, a
shutdown function is provided to cut the supply current to less
than 0.5 µA.
The TMP35 is functionally compatible with the LM35/LM45
and provides a 250 mV output at 25°C. The TMP35 reads
temperatures from 10°C to 125°C. The TMP36 is specified from
−40°C to +125°C, provides a 750 mV output at 25°C, and
operates to 125°C from a single 2.7 V supply. The TMP36 is
functionally compatible with the LM50. Both the TMP35 and
TMP36 have an output scale factor of 10 mV/°C.
Figure 3. R-8 (SOIC_N)
Figure 4. T-3 (TO-92)
The TMP37 is intended for applications over the range of 5°C
to 100°C and provides an output scale factor of 20 mV/°C. The
TMP37 provides a 500 mV output at 25°C. Operation extends
to 150°C with reduced accuracy for all devices when operating
from a 5 V supply.
The TMP35/TMP36/TMP37 are available in low cost 3-lead
TO-92, 8-lead SOIC_N, and 5-lead SOT-23 surface-mount
packages.
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Rev. H
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TMP35/TMP36/TMP37 Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 1
Pin Configurations ........................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
Absolute Maximum Ratings ............................................................ 4
Thermal Resistance ...................................................................... 4
ESD Caution .................................................................................. 4
Typical Performance Characteristics ............................................. 5
Functional Description .................................................................... 8
Applications Information ................................................................ 9
Shutdown Operation .................................................................... 9
Mounting Considerations ........................................................... 9
Thermal Environment Effects .................................................... 9
Basic Temperature Sensor Connections .................................. 10
Fahrenheit Thermometers ........................................................ 10
Average and Differential Temperature Measurement ........... 12
Microprocessor Interrupt Generator ....................................... 13
Thermocouple Signal Conditioning with Cold-Junction
Compensation ............................................................................. 14
Using TMP35/TMP36/TMP37 Sensors in Remote
Locations ..................................................................................... 15
Temperature to 4–20 mA Loop Transmitter .......................... 15
Temperature-to-Frequency Converter .................................... 16
Driving Long Cables or Heavy Capacitive Loads .................. 17
Commentary on Long-Term Stability ..................................... 17
Outline Dimensions ....................................................................... 18
Ordering Guide .......................................................................... 19
Automotive Products ................................................................. 19
REVISION HISTORY
5/15—Rev. G to Rev. H
Changed TMP3x to TMP35/TMP36/TMP37 ............ Throughout
Changes to Figure 28 ...................................................................... 12
Changes to Ordering Guide .......................................................... 19
11/13—Rev. F to Rev. G
Change to Table 1, Long-Term Stability Parameter ..................... 3
Change to Caption for Figure 38 .................................................. 18
Changes to Ordering Guide .......................................................... 19
11/10—Rev. E to Rev. F
Changes to Features .......................................................................... 1
Updated Outline Dimensions ....................................................... 18
Changes to Ordering Guide .......................................................... 19
Added Automotive Products Section........................................... 20
8/08—Rev. D to Rev. E
Updated Outline Dimensions ....................................................... 18
Changes to Ordering Guide .......................................................... 19
3/05—Rev. C to Rev. D
Updated Format .................................................................. Universal
Changes to Specifications ................................................................ 3
Additions to Absolute Maximum Ratings ..................................... 4
Updated Outline Dimensions ....................................................... 18
Changes to Ordering Guide .......................................................... 19
10/02—Rev. B to Rev. C
Changes to Specifications ................................................................. 3
Deleted Text from Commentary on Long-Te rm Stability
Section .............................................................................................. 13
Updated Outline Dimensions ....................................................... 14
9/01—Rev. A to Rev. B
Edits to Specifications ....................................................................... 2
Addition of New Figure 1 ................................................................. 2
Deletion of Wafer Test Limits Section ............................................ 3
6/97—Rev. 0 to Rev. A
3/96—Revision 0: Initial Version
Rev. H | Page 2 of 19
Data Sheet TMP35/TMP36/TMP37
Parameter1
Symbol
Test Conditions/Comments
Min
Typ
Max
Unit
Scale Factor, TMP36
−40°C ≤ TA ≤ +125°C
10 mV/°C
Output Voltage Range
100 2000
mV
SPECIFICATIONS
VS = 2.7 V to 5.5 V, −40°C ≤ TA ≤ +125°C, unless otherwise noted.
Table 1.
ACCURACY
TMP35/TMP36/TMP37 (F Grade) TA = 25°C ±1 ±2 °C
TMP35/TMP36/TMP37 (G Grade) TA = 25°C ±1 ±3 °C
TMP35/TMP36/TMP37 (F Grade) Over rated temperature ±2 ±3 °C
TMP35/TMP36/TMP37 (G Grade) Over rated temperature ±2 ±4 °C
Scale Factor, TMP35 10°C ≤ TA ≤ 125°C 10 mV/°C
Scale Factor, TMP37 5°C ≤ TA ≤ 85°C 20 mV/°C
5°C ≤ TA ≤ 100°C 20 mV/°C
3.0 V ≤ VS ≤ 5.5 V
Load Regulation 0 µA ≤ IL ≤ 50 µA
−40°C ≤ TA ≤ +105°C 6 20 m°C/µA
−105°C ≤ TA ≤ +125°C 25 60 m°C/µA
Power Supply Rejection Ratio PSRR TA = 25°C 30 100 m°C/V
3.0 V ≤ VS ≤ 5.5 V 50 m°C/V
Linearity 0.5 °C
Long-Term Stability TA = 150°C for 1000 hours 0.4 °C
SHUTDOWN
Logic High Input Voltage VIH VS = 2.7 V 1.8 V
Logic Low Input Voltage VIL VS = 5.5 V 400 mV
OUTPUT
TMP35 Output Voltage TA = 25°C 250 mV
TMP36 Output Voltage TA = 25°C 750 mV
TMP37 Output Voltage TA = 25°C 500 mV
Output Load Current IL 0 50 µA
Short-Circuit Current ISC Note 2 250 µA
Capacitive Load Driving CL
Device Turn-On Time
POWER SUPPLY
Supply Range VS 2.7 5.5 V
Supply Current ISY (ON) Unloaded 50 µA
Supply Current (Shutdown) ISY (OFF) Unloaded 0.01 0.5 µA
1
Does not consider errors caused by self-heating.
2
Guaranteed but not tested.
No oscillations
Output within ±1°C, 100 kΩ||100 pF load
2
1000 10000 pF
2
0.5 1 ms
Rev. H | Page 3 of 19
TMP35/TMP36/TMP37 Data Sheet
Shutdown Pin
GND ≤
≤ +VS
Peak Temperature
220°C (0°C/5°C)
IR Reflow Soldering—Pb-Free Package
ABSOLUTE MAXIMUM RATINGS
Table 2.
Parameter
Supply Voltage 7 V
Output Pin GND ≤ V
Operating Temperature Range −55°C to +150°C
Die Junction Temperature 175°C
Storage Temperature Range −65°C to +160°C
IR Reflow Soldering
Time at Peak Temperature Range 10 sec to 20 sec
Ramp-Up Rate 3°C/sec
Ramp-Down Rate −6°C/sec
Time 25°C to Peak Temperature 6 min
Peak Temperature 260°C (0°C)
Time at Peak Temperature Range 20 sec to 40 sec
Ramp-Up Rate 3°C/sec
Ramp-Down Rate −6°C/sec
Time 25°C to Peak Temperature 8 min
1
Digital inputs are protected; however, permanent damage can occur on
unprotected units from high energy electrostatic fields. Keep units in
conductive foam or packaging at all times until ready to use. Use proper
antistatic handling procedures.
2
Remove power before inserting or removing units from their sockets.
1, 2
Rating
SHUTDOWN
≤ +VS
OUT
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device in
socket.
Table 3. Thermal Resistance
Package Type θJA θJC Unit
TO-92 (T-3-1) 162 120 °C/W
SOIC_N (R-8) 158 43 °C/W
SOT-23 (RJ-5) 300 180 °C/W
ESD CAUTION
Rev. H | Page 4 of 19
Data Sheet TMP35/TMP36/TMP37
TEMPERATURE (°C)
–50
LOAD REGUL ATION (m° C/µA)
0 50 100
150
50
30
20
10
0
40
00337-005
TEMPERATURE (°C)
1.4
0
1.2
1.0
0.8
0.6
0.4
0.2
1.6
1.8
2.0
–50
–25 0
25 50
75 100 125
OUTPUT VOLTAGE (V)
a
b
c
a. TMP35
b. TMP36
c. TMP37
+V
S
= 3V
00337-007
a. MAXIMUM LIMIT (G GRADE)
b. TYPICAL ACCURACY ERROR
c. MINIMUM LIMIT (G GRADE)
TEMPERATURE (°C)
2
–5
1
0
–1
–2
–3
–4
3
4
5
0 20 40 60 80 100 120 140
a
b
c
ACCURACY ERROR (°C)
00337-008
TEMPERATURE (°C)
0.4
0.3
0
–50 125
–25
0
25
50
75
100
0.2
0.1
POWER SUPPLY REJECTION (°C/V)
+V
S
= 3V TO 5.5V, NO LOAD
00337-009
FREQUENCY (Hz)
100.000
0.010
20
100k100
1k
10k
31.600
10.000
3.160
1.000
0.320
0.100
0.032
POWER SUPPLY REJECTION (
°
C/V)
00337-010
TEMPERATURE (
°C)
4
3
0
2
1
5
–50 125
–25 0 25 50 75
100
MINIMUM SUPPLY VOLTAGE (V)
b
a
MINIMUM SUPPLY VOLTAGE REQUIRED TO MEET
DATA SHEET SPECIFICATION
NO LOAD
a. TMP35/TMP36
b. TMP37
00337-011
TYPICAL PERFORMANCE CHARACTERISTICS
Figure 5. Load Regulation vs. Temperature (m°C/µA)
Figure 6. Output Voltage vs. Temperature
Figure 8. Power Supply Rejection vs. Temperature
Figure 9. Power Supply Rejection vs. Frequency
Figure 7. Accuracy Error vs. Temperatu re
Figure 10. Minimum Supply Voltage vs. Temperature
Rev. H | Page 5 of 19
TMP35/TMP36/TMP37 Data Sheet
SUPPLY CURRENT ( µA)
TEMPERATURE (°C)
50
40
10
30
20
60
–50 125–25 0 25 50 75 100
NO LOAD
b
a
a. +VS = 5V
b. +V
S
= 3V
00337-012
SUPPLY VOLTAGE (V)
40
30
0
20
10
50
0 71 2 3 4 5
6
SUPPLY CURRENT (µA)
TA = 25°C, NO LOAD
8
00337-013
TEMPERATURE (°C)
40
30
0
20
10
50
–50 125–25
0
25 50 75
100
a. +VS= 5V
b. +VS= 3V
NO LOAD
a
b
SUPPLY CURRENT ( nA)
00337-014
TEMPERATURE (°C)
400
300
0
200
100
–50
125–25 0 25 50 75
100
= +V
S
AND SHUTDOWN PINS
LOW TO HIGH (0V TO 3V)
V
OUT
SETTLES WITHIN ±1°C
= +VS AND SHUTDOWN PINS
HIGH TO LOW (3V TO 0V)
RESPONSE TIME (µs)
00337-015
TEMPERATURE (°C)
400
300
0
200
100
–50 125–25
0 25 50 75
100
= SHUTDOWN P IN
HIGH TO LOW (3V TO 0V)
= SHUTDOWN P IN
LOW TO HIGH (0V TO 3V)
V
OUT
SETTLES WITHIN ±1°C
RESPONSE TIME (µs)
00337-016
TIME (µs)
0
1.0
0.8
0.6
0.4
0.2
–50 2500 10050 150 200 300 350 400 450
OUTPUT VOLTAGE (V)
0
1.0
0.8
0.6
0.4
0.2
TA = 25°C
+V
S
= 3V
SHUTDOWN =
SIGNAL
TA = 25°C
+V
S
AND SHUTDOWN =
SIGNAL
00337-017
Figure 11. Supply Current vs. Temperature
Figure 12. Supply Current vs. Supply Voltage
Figure 14. V
Figure 15. V
Response Time for +VS Power-Up/Power-Down vs.
OUT
Temperature
Response Time for
OUT
SHUTDOWN
Pin vs. Temperature
Figure 13. Supply Current vs. Temperature (Shutdown = 0 V)
Figure 16. V
Response Time to
OUT
SHUTDOWN
Pin and +VS Pin vs. Time
Rev. H | Page 6 of 19
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