Low Voltage Temperature Sensors

TMP35/TMP36/TMP37

Rev. F

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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

GENERAL DESCRIPTION

The TMP35/TMP36/TMP37 are low voltage, precision centi-

grade 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 maxi-

mum. 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.

FUNCTIONAL BLOCK DIAGRAM

SHUTDOWN

TMP35/

TMP36/

TMP37

Figure 1.

PIN CONFIGURATIONS

1

2

3

5

4

TOP VIEW

(Not to Scale)

NC = NO CONNECT

SHUTDOWN

GND

NC

Figure 2. RJ-5 (SOT-23)

1

2

3

4

8

7

6

5

TOP VIEW

(Not to Scale)

NC = NO CONNECT

SHUTDOWN

NC

NC

NC

NC

GND

Figure 3. R-8 (SOIC_N)

1

3

2

BOTTOM VIEW

(Not to Scale)

Figure 4. T-3 (TO-92)

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 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.