Analog Devices TMP35, TMP37, TMP36 Datasheet

a

Low Voltage Temperature Sensors

TMP35/TMP36/TMP37

FEATURES
Low Voltage Operation (+2.7 V to +5.5 V)
Calibrated Directly in 8C
10 mV/8C Scale Factor (20 mV/8C on TMP37)

628C Accuracy Over Temperature (typ)

60.58C Linearity (typ)

Stable with Large Capacitive Loads
Specified –408C to +1258C, Operation to +1508C
Less than 50 mA Quiescent Current
Shutdown Current 0.5 mA 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

(Not to Scale)

NC

3

NC = NO CONNECT

TOP VIEW

GND

5

4

SHUTDOWN

SO-8

V

1

OUT

NC

2

(Not to Scale)

3

NC

GND

4

NC = NO CONNECT

TOP VIEW

+V

8

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. A

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
which 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] World Wide Web Site: http://www.analog.com
Fax: [phone] © Analog Devices, Inc., 1997

(V

= +2.7 V to +5.5 V, –408C ≤ TA ≤ +1258C

S

1

TMP35/TMP36/TMP37F/G–SPECIFICATIONS

unless otherwise noted)

Parameter Symbol Conditions Min Typ Max Units

ACCURACY

TMP35/TMP36/TMP37F T
TMP35/TMP36/TMP37G T

= +25°C ±1 ±2 °C

A

= +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
Power Supply Rejection Ratio PSRR T

= +25°C 30 100 m°C/V

A

PSRR 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 µA120m°C/µA

L

≤ 5.5 V 50 m°C/V

S

Linearity 0.5 °C
Long-Term Stability T

= +150°C for 1 kHrs 0.4 °C

A

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 T
TMP36 Output Voltage T
TMP37 Output Voltage T

= +25°C 250 mV

A

= +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 kΩi100 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.

Specifications subject to change without notice.

S
SY (ON)
SY (OFF)

2.7 5.5 V

Unloaded 50 µA
Unloaded 0.01 0.5 µA

–2–

REV. A

TMP35/TMP36/TMP37

WAFER TEST LIMITS

(VS = +5 V, GND = O V, TA = +258C, unless otherwise noted)

Parameter Symbol Conditions Min Typ Max Units

ACCURACY

Scale Factor Deviation T
Power Supply Rejection Ratio PSRR 2.7 V ≤ +V

= +25°C ±2 °C

A

≤ 5.5 V 30 m°C/V

S

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 T
TMP36 Output Voltage T
TMP37 Output Voltage T
Short-Circuit Current I

SC

Device Turn-On Time Output within ±1°C 0.5 1 ms

= +25°C 250 mV

A

= +25°C 750 mV

A

= +25°C 500 mV

A

V

= 5.5 V 250 µA

S

100 kΩi100 pF Load

1

POWER SUPPLY

Supply Range V+ 2.7 5.5 V
Supply Current I
Supply Current (Shutdown) I

NOTES
Electrical tests are performed at wafer probe to the limits shown. Due to variations in assembly methods and normal yield loss, yield after packaging is not guaranteed
for standard product dice. Consult factory to negotiate specifications based on dice lot qualification through sample lot assembly and testing.

1

Guaranteed but not tested.

(ON) Unloaded at +5 V 50 µA

SY

(OFF) Unloaded at +5 V 0.5 µA

SY

DICE CHARACTERISTICS

Die Size 0.027 × 0.030 inch, 810 sq. mils

(0.685 × 0.762 mm, 0.522 sq. mm)

TRANSISTOR COUNT: 25

Substrate is connected to +V

S

1. V

OUT

1 4

32

2. GND

3. SHUTDOWN

4. +V

S

For additional DICE ordering information, refer to databook.

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.

WARNING!

ESD SENSITIVE DEVICE

REV. A

–3–

TMP35/TMP36/TMP37

SHDN

+V

OUT

+V

S

3X

25µA

2X

Q2
1X

R1

R2

R3

7.5µA

Q3

2X

GND

Q4

Q1

10X

6X

ABSOLUTE MAXIMUM RATINGS*

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

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

Output Pin . . . . . . . . . . . . . . . . . . . . . . GND # V

≤

SHUTDOWN ≤ +V

# +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 u

JA

u

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).

FUNCTIONAL DESCRIPTION

An equivalent circuit for the TMP3x family of micropower,
centigrade temperature sensors is shown in Figure 1. 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

∆VBE=VT× ln

E,Q1





A





E,Q2

ORDERING GUIDE

Accuracy Linear
at 258C Operating Package

Model (8C max) Temperature Range Options

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
TMP35GRT

2

±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
TMP36GRT

2

±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
TMP37GRT

NOTES

1

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

2

Consult factory for availability.

2

±3.0 +5°C to +100°C RT-5

1

Figure 1. 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

between the three temperature sensors’ output characteristics:

Table I. TMP3x Output Characteristics

Offset Output Voltage Output Voltage

Sensor Voltage (V) Scaling (mV/8C) @ 258C

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.

–4–

as

BE

REV. A

TMP35/TMP36/TMP37

FREQUENCY – Hz

100

0.01
20 100k100 1k 10k

31.6

10

3.16

1

0.32

0.1

0.032

POWER SUPPLY REJECTION – 8C/V

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

OUTPUT VOLTAGE – Volts

0.4

0.2

0

250 225 0 25 50 75 100 125

a. TMP35
b. TMP36
c. TMP37

VS = 3V

c

a

TEMPERATURE – 8C

Figure 2. Output Voltage vs. Temperature

5
4
3

a. MAXIMUM LIMIT ( G GRADE )

2
1

0

21
22

ACCURACY ERROR – 8C

23
24

25

0 20 40 60 80 100 120 140

a

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

b

c

TEMPERATURE – 8C

Figure 3. Accuracy Error vs. Temperature

b

Figure 5. 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 – Volts

a. TMP35/TMP36
b. TMP37

0
250 125225 0 25 50 75 100

TEMPERATURE – 8C

a

Figure 6. Minimum Supply Voltage vs. Temperature

0.4

V+ = +3V to +5.5V, NO LOAD

0.3

0.2

0.1

POWER SUPPLY REJECTION – 8C/V

0
250 125225 0 25 50 75 100

Figure 4. Power Supply Rejection vs. Temperature

REV. A

TEMPERATURE – 8C

–5–

60

a. V+ = 5V

50

40

30

SUPPLY CURRENT – µA

20

10

b. V+ = 3V

NO LOAD

a

b

250 125225 0 25 50 75 100

TEMPERATURE – 8C

Figure 7. Supply Current vs. Temperature