Analog Devices TMP37GT9, TMP37GS, TMP37GRT, TMP35FT9, TMP35FS Datasheet

a

Low Voltage Temperature Sensors

TMP35/TMP36/TMP37

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 A Quiescent Current
Shutdown Current 0.5 A Max
Low Self-Heating

APPLICATIONS
Environmental Control Systems
Thermal Protection
Industrial Process Control
Fire Alarms
Power System Monitors
CPU Thermal Management

PRODUCT DESCRIPTION

The TMP35, TMP36, and 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 A/D converters. All three devices
are intended for single-supply operation from 2.7 V to 5.5 V
maximum. 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 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. The TMP37 is intended for applications
over the range 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 all available in low cost 3-pin
TO-92, and SO-8 and 5-pin SOT-23 surface mount packages.

FUNCTIONAL BLOCK DIAGRAM

+Vs (2.7V to 5.5V)

TMP35/

SHUTDOWN

TMP36/

TMP37

V

OUT

PACKAGE TYPES AVAILABLE

RT-5 (SOT-23)

V

1

OUT

+V

2

S

3

NC

NC = NO CONNECT

TOP VIEW

(Not to Scale)

GND

5

4

SHUTDOWN

SO-8

1

V

OUT

2

NC

3

NC

4

GND

NC = NO CONNECT

TOP VIEW

(Not to Scale)

8

+V

S

7

NC

6

NC

5

SHUTDOWN

TO-92

2

1 3

BOTTOM VIEW

(Not to Scale)

PIN 1, +Vs; PIN 2, V

; PIN 3, GND

OUT

REV. B

Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone] www.analog.com
Fax: [phone] © Analog Devices, Inc., 2001

(VS = 2.7 V to 5.5 V, –40C ≤ TA ≤ +125C unless

1

TMP35/TMP36/TMP37–SPECIFICATIONS

otherwise noted)

Parameter Symbol Conditions Min Typ Max Unit

ACCURACY

TMP35/TMP36/TMP37F TA = 25°C ±1 ±2 °C
TMP35/TMP36/TMP37G T

= 25°C ±1 ±3 °C

A

TMP35/TMP36/TMP37F Over Rated Temperature ±2 ±3 °C
TMP35/TMP36/TMP37G Over Rated Temperature ±2 ±4 °C
Scale Factor, TMP35 10°C ≤ T
Scale Factor, TMP36 –40°C ≤ T
Scale Factor, TMP37 5°C ≤ T

5°C ≤ T

3.0 V ≤ +V

Load Regulation 0 µA ≤ I

–40°C ≤ T
–105°C ≤ T

Power Supply Rejection Ratio PSRR T

= 25°C 30 100 m°C/V

A

3.0 V ≤ +V

≤ 125°C 10 9.8/10.2 mV/°C

A

≤ +125°C 10 9.8/10.2 mV/°C

A

≤ 85°C 20 19.6/20.4 mV/°C

A

≤ 100°C 20 19.6/20.4 mV/°C

A

≤ 5.5 V

S

≤ 50 µA

L

≤ +105°C620m°C/µA

A

≤ +125°C2560m°C/µA

A

≤ 5.5 V 50 m°C/V

S

Linearity 0.5 °C
Long-Term Stability TA = +150°C for 1 kHrs 0.4 °C

SHUTDOWN

Logic High Input Voltage V
Logic Low Input Voltage V

IH

IL

VS = 2.7 V 1.8 V
VS = 5.5 V 400 mV

OUTPUT

TMP35 Output Voltage TA = 25°C 250 mV
TMP36 Output Voltage T
TMP37 Output Voltage T

= 25°C 750 mV

A

= 25°C 500 mV

A

Output Voltage Range 100 2000 mV
Output Load Current I
Short-Circuit Current I
Capacitive Load Driving C
Device Turn-On Time Output within ±1°C 0.5 1 ms

L

SC

Note 2 250 µA

L

No Oscillations

100 kΩ100 pF Load

2

2

050µA

1000 10000 pF

POWER SUPPLY

Supply Range +V
Supply Current I
Supply Current (Shutdown) I

NOTES

1

Does not consider errors caused by self-heating.

2

Guaranteed but not tested.

3

See Figure 1.

Specifications subject to change without notice.

S

SY (ON)

SY (OFF)

Unloaded 50 µA
Unloaded 0.01 0.5 µA

2.7 5.5 V

50

40

30

20

LOAD REG – mC/A

10

0

–50

0 50 100 150

TEMPERATURE – C

Figure 1. Load Reg vs. Temperature (m°C/µA)

–2–

REV. B

TMP35/TMP36/TMP37

WARNING!

ESD SENSITIVE DEVICE

ABSOLUTE MAXIMUM RATINGS*

Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 V

Shutdown Pin . . . . . . . . . . . . . . GND

Output Pin . . . . . . . . . . . . . . . . . . . . . . GND ⱕ V

≤

SHUTDOWN ≤ +V

ⱕ +V

OUT

S

S

Operating Temperature Range . . . . . . . . . . –55°C to +150°C

Dice Junction Temperature . . . . . . . . . . . . . . . . . . . . . . 175°C

Storage Temperature Range . . . . . . . . . . . . –65°C to +160°C

Lead Temperature (Soldering, 60 sec) . . . . . . . . . . . . . 300°C

*CAUTION

1. Stresses above those listed under Absolute Maximum Ratings may cause
permanent damage to the device. This is a stress rating only; functional operation
at or above this specification is not implied. Exposure to the above maximum
rating conditions for extended periods may affect device reliability.

2. Digital inputs are protected; however, permanent damage may 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.

3. Remove power before inserting or removing units from their sockets.

Package Type 

JA



JC

Units

TO-92 (T9 Suffix) 162 120 °C/W
SO-8 (S Suffix) 158 43 °C/W
SOT-23 (RT Suffix) 300 180 °C/W

θJA is specified for device in socket (worst-case conditions).

ORDERING GUIDE

Accuracy Linear
at 25C Operating Package

Model (C max) Temperature Range Options

1

TMP35FT9 ±2.0 10°C to 125°C TO-92
TMP35GT9 ±3.0 10°C to 125°C TO-92
TMP35FS ±2.0 10°C to 125°C SO-8
TMP35GS ± 3.0 10°C to 125°C SO-8
TMP35GRT2±3.0 10°C to 125°C RT-5

TMP36FT9 ±2.0 –40°C to +125°C TO-92
TMP36GT9 ±3.0 –40°C to +125°C TO-92
TMP36FS ±2.0 –40°C to +125°C SO-8
TMP36GS ± 3.0 –40°C to +125°C SO-8
TMP36GRT2±3.0 –40°C to +125°C RT-5

TMP37FT9 ±2.0 5°C to 100°C TO-92
TMP37GT9 ±3.0 5°C to 100°C TO-92
TMP37FS ±2.0 5°C to 100°C SO-8
TMP37GS ± 3.0 5°C to 100°C SO-8
TMP37GRT2±3.0 5°C to 100°C RT-5

NOTES

1

SO = Small Outline; RT = Plastic Surface Mount; TO = Plastic.

2

Consult factory for availability.

FUNCTIONAL DESCRIPTION

An equivalent circuit for the TMP3x family of micropower,
centigrade temperature sensors is shown in Figure 2. At the
heart of the temperature sensor is a bandgap core, which is
comprised of transistors Q1 and Q2, biased by Q3 to approxi­mately 8 µA. The bandgap core operates both Q1 and Q2 at the
same collector current level; however, since the emitter area of
Q1 is 10 times that of Q2, Q1’s V

and Q2’s VBE are not equal

BE

by the following relationship:





A

7.5A

Q2
1X

E,Q1





A





E,Q2

25A

3X

2X

R1

R3

R2

2X

+V

SHDN

+V

OUT

GND

∆VBE=VT× ln

S

Q4

Q1

10X

Q3

6X

Figure 2. Temperature Sensor Simplified

Equivalent Circuit

Resistors R1 and R2 are used to scale this result to produce the
output voltage transfer characteristic of each temperature sensor
and, simultaneously, R2 and R3 are used to scale Q1’s V
an offset term in V

. Table I summarizes the differences

OUT

BE

as

between the three temperature sensors’ output characteristics:

Table I. TMP3x Output Characteristics

Offset Output Voltage Output Voltage

Sensor Voltage (V) Scaling (mV/C) @ 25C

TMP35 0 10 250 mV
TMP36 0.5 10 750 mV
TMP37 0 20 500 mV

The output voltage of the temperature sensor is available at the
emitter of Q4, which buffers the bandgap core and provides load
current drive. Q4’s current gain, working with the available base
current drive from the previous stage, sets the short-circuit
current limit of these devices to 250 µA.

CAUTION

ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the TMP35/TMP36/TMP37 features proprietary ESD protection circuitry, permanent damage
may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD
precautions are recommended to avoid performance degradation or loss of functionality.

REV. B

–3–

TMP35/TMP36/TMP37

– Typical Performance Characteristics

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

OUTPUT VOLTAGE – V

0.4

0.2

50 25 0 25 50 75 100 125

a. TMP35
b. TMP36
c. TMP37

= 3V

V

S

0

TEMPERATURE – C

c

a

TPC 1. Output Voltage vs. Temperature

5

4

3

a. MAXIMUM LIMIT ( G GRADE )

2

1

0

1

2

ACCURACY ERROR – C

3

4

5

0 20 40 60 80 100 120 140

a

b. TYPICAL ACCURACY ERROR
c. MINIMUM LIMIT ( G GRADE )

b

c

TEMPERATURE – C

TPC 2. Accuracy Error vs. Temperature

100

31.6

10

b

3.16

1

0.32

0.1

POWER SUPPLY REJECTION – C/V

0.032

0.01
20 100k100 1k 10k

FREQUENCY – Hz

TPC 4. Power Supply Rejection vs. Frequency

5

MINIMUM SUPPLY VOLTAGE REQUIRED TO MEET

4

DATA SHEET SPECIFICATION

NO LOAD

3

b

2

1

MINIMUM SUPPLY VOLTAGE – V

a. TMP35/ TMP36
b. TMP37

0
50 12525 0 25 50 75 100

TEMPERATURE – C

a

TPC 5. Minimum Supply Voltage vs. Temperature

0.4

V+ = 3V to 5.5V, NO LOAD

0.3

0.2

0.1

POWER SUPPLY REJECTION – C/V

0
50 12525 0 25 50 75 100

TEMPERATURE – C

TPC 3. Power Supply Rejection vs. Temperature

–4–

60

a. V+ = 5V

50

40

30

SUPPLY CURRENT – A

20

10

b. V+ = 3V

NO LOAD

a

50 12525 0 25 50 75 100

TEMPERATURE – C

TPC 6. Supply Current vs. Temperature

b

REV. B

TMP35/TMP36/TMP37

50

TA = 25°C, NO LOAD

40

30

20

SUPPLY CURRENT – A

10

0

07123456

SUPPLY VOLTAGE – V

8

TPC 7. Supply Current vs. Supply Voltage

50

a. V+ = 5V
b. V+ = 3V

40

NO LOAD

30

20

SUPPLY CURRENT – nA

10

0
50 12525 0 25 50 75

TEMPERATURE – C

a

b

100

TPC 8. Supply Current vs. Temperature (Shutdown = 0 V)

400

= SHUTDOWN PIN
HIGH TO LOW (3V TO 0V)

300

200

RESPONSE TIME – s

100

0
50 12525 0 25 50 75

TPC 10. V

Response Time for Shutdown Pin vs.

OUT

TEMPERATURE – C

= SHUTDOWN PIN
LOW TO HIGH (0V TO 3V)

SETTLES WITHIN ±1°C

V

OUT

Temperature

1.0

0.8

0.6

0.4

0.2

0

1.0

0.8

0.6

OUTPUT VOLTAGE – Volts

0.4

0.2

0
50 2500 10050 150 200 300 350 400 450

TPC 11. V

Response Time to Shutdown and V+

OUT

= 25°C

T

A

V+ = 3V

SHUTDOWN =
SIGNAL

T

= 25°C

A

V+ AND SHUTDOWN =

SIGNAL

TIME – µs

Pins vs. Time

100

400

300

200

RESPONSE TIME – s

100

0
50 12525 0 25 50 75

TPC 9. V

Response Time for V+ Power-Up/Power-

OUT

Down vs. Temperature

REV. B

= V+ AND SHUTDOWN PINS
HIGH TO LOW (3V TO 0V)

= V+ AND SHUTDOWN PINS
LOW TO HIGH (0V TO 3V)

SETTLES WITHIN ±1°C

V

OUT

TEMPERATURE – C

100

–5–

110

100

90

80

70

60

50

40

30

PERCENT OF CHANGE – %

20

10

0

0

a

b

a. TMP35 SOIC SOLDERED TO 0.5" x 0.3" Cu PCB
b. TMP36 SOIC SOLDERED TO 0.6" x 0.4" Cu PCB
c. TMP35 TO-92 IN SOCKET SOLDERED TO
1" x 0.4" Cu PCB

100

c

200 300 400 500 600

TIME – sec

VIN = 3V, 5V

TPC 12. Thermal Response Time in Still Air