TMP37GRT View Datasheet(PDF) - Analog Devices

Part Name

Description

View to exact match

TMP37GRT

Low Voltage Temperature Sensors

Analog Devices 

TMP35/TMP36/TMP37

ABSOLUTE MAXIMUM RATINGS1, 2, 3

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

Shutdown Pin . . . . . . . . . . . . . . GND ≤ SHUTDOWN ≤ +VS

Output Pin . . . . . . . . . . . . . . . . . . . . . . GND Յ VOUT Յ +VS

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

NOTES

1Stresses above those listed under Absolute Maximum Ratings may cause perma-

nent damage to the device. This is a stress rating only; functional operation at or

above this specification is not implied. Exposure to maximum rating conditions for

extended periods may affect device reliability.

2Digital inputs are protected; however, permanent damage may occur on unpro-

tected 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.

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

Package Type

TO-92 (T9 Suffix)

SOIC-8 (S Suffix)

SOT-23 (RT Suffix)

␪JA

␪JC

Unit

162

120 °C/W

158

43

°C/W

300

180 °C/W

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 band gap core, which is

comprised of transistors Q1 and Q2, biased by Q3 to approxi-

mately 8 µA. The band gap 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 VBE and Q2’s VBE are not equal

by the following relationship:

∆VBE

= VT

×

ln





AE ,Q1

AE ,Q2





+VS

SHDN

25␮A

3X 2X

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

ORDERING GUIDE

Model

TMP35FT9

TMP35GT9

TMP35FS

TMP35GS

TMP35GRT2

TMP36FT9

TMP36GT9

TMP36FS

TMP36GS

TMP36GRT2

TMP37FT9

TMP37GT9

TMP37FS

TMP37GS

TMP37GRT2

Accuracy

at 25؇C

(؇C max)

± 2.0

± 3.0

± 2.0

± 3.0

± 3.0

± 2.0

± 3.0

± 2.0

± 3.0

± 3.0

± 2.0

± 3.0

± 2.0

± 3.0

± 3.0

Linear

Operating

Temperature Range

10°C to 125°C

10°C to 125°C

10°C to 125°C

10°C to 125°C

10°C to 125°C

–40°C to +125°C

–40°C to +125°C

–40°C to +125°C

–40°C to +125°C

–40°C to +125°C

5°C to 100°C

5°C to 100°C

5°C to 100°C

5°C to 100°C

5°C to 100°C

Package

Options1

TO-92

TO-92

RN-8

RN-8

RT-5

TO-92

TO-92

RN-8

RN-8

RT-5

TO-92

TO-92

RN-8

RN-8

RT-5

Q4

+VOUT

GND

Q2

1X

R1

Q1

10X

R3

R2

7.5␮A

Q3

2X

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 VBE as

an offset term in VOUT. Table I summarizes the differences

between the three temperature sensors’ output characteristics.

Sensor

Table I. TMP3x Output Characteristics

Offset

Output Voltage Output Voltage

Voltage (V) Scaling (mV/؇C) @ 25؇C (mV)

NOTES

TMP35 0

10

250

1SOIC = Small Outline Integrated Circuit; RT = Plastic Surface Mount;

TMP36 0.5

10

750

TO = Plastic.

2Consult factory for availability.

TMP37 0

20

500

The output voltage of the temperature sensor is available at the

emitter of Q4, which buffers the band gap 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.

WARNING!

ESD SENSITIVE DEVICE

REV. C

–3–

Share Link: