MOTOROLA NCT47SNT1 Datasheet

NCT47

High Precision Temperature-
to-V oltage Converter

The NCT47 is linear output temperature sensor whose output

voltage is directly proportional to measured temperature. The NCT47
can accurately measure temperature from –40°C to +125°C.

For the NCT47, the output voltage range is typically 100mV at

–40°C, 500mV at 0°C, 750mV at +25°C, and 1.75V at +125°C. A
10mV/°C voltage slope allows for the wide temperature range. The
NCT47 is packaged in space saving 3–Pin SOT–23B packages,
making them ideal for space critical applications.

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Features

• Wide Temperature Measurement Range: –40°C to 125°C

• High T emperature Converter Accuracy: ±2°C Max at 25°C

• Linear Temperature Slope: 10mV/°C

• 2.7V to 4.4V Operating Range

• Small 3–Pin SOT–23B Package

• Very Low Supply Current: 35µA typical

Typical Applications

• Cellular Phones

• Power Supply Thermal Shutdown

• T emperature–Controlled Fans

• T emperature Measurement / Instrumentation

• T emperature Regulators

• Consumer Electronic

• Portable Battery Powered Equipment

FUNCTIONAL BLOCK DIAGRAM

VDD = 2.7V to 4.4V

MICROCONTROLLER

V

NCT47

DD

V

OUT

A/D

CONVERTER

SOT–23B

(TO–236)

CASE TBD

PIN CONFIGURATION

(Top View)

1

V

DD

V

3

SS

V

NOTE: *SOT–23B is equivalent to JEDEC (TO–236)

Device Package Shipping

NCT47SNT1 SOT–23B 3000 Tape/Reel

2

OUT

SOT–23B*

ORDERING INFORMATION

V

SS

 Semiconductor Components Industries, LLC, 2000

May, 2000 – Rev. 0

1 Publication Order Number:

NCT47/D

NCT47

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ABSOLUTE MAXIMUM RATINGS*

Symbol Parameter Value Unit

V

DD

V

SS

T

A

T

stg

T

sol

* Maximum Ratings are those values beyond which damage to the device may occur.

Supply Voltage +7.0 V
Voltage on Any Pin with Respect to Supplies (VSS – 0.3) to (VDD + 0.3) V
Operating Temperature Range –40 to +125 °C
Storage Temperature Range –55 to +150 °C
Lead Temperature (Soldering, 10 Seconds) +260 °C

ELECTRICAL CHARACTERISTICS (TA = –40°C to +125°C, V

= 2.7V to 4.4V , unless otherwise noted .)

DD

Symbol Characteristic Min Typ Max Unit

V

DD

I

Q

A

V

TMP

ACY25

TMP

ACY125

TMP

ACY–40

V

OUT–40

V

OUT+25

V

OUT+125

I

OUT

Supply Voltage 2.7 — 4.4 V
Supply Current, Operating — 35 60 µA
Average Slope of Output Voltage — 10 — mV/°C
Temperature Accuracy at 25°CT

= 25°C –2.0 ±0.5 +2.0 °C

A

Temperature Accuracy TA = 125°C –3.0 — +3.0 °C
Temperature Accuracy TA = –40°C — 1.5 — °C
Output Voltage at –40°C — 100 — mV
Output Voltage at 25°C 730 750 770 mV
Output Voltage at 125°C 1720 1750 1780 mV
Output Source and Sink Current 100 — — µA

PIN DESCRIPTION

Pin No. Symbol Description

1
2
3

V

V

V

DD

OUT

SS

Input Supply Voltage
Temperature Sensor Output Terminal
Ground Terminal

DET AILED DESCRIPTION

The NCT47 has an output voltage that varies linearly with
temperature in degrees Celsius. Figure 1 shows a plot of the
output voltage versus temperature for the NCT47. The

V

= (10 mV/°C) (Temperature °C) + 500 mV

OUT

1.75

1.7

1.5

1.3

1.1

0.9

out

V (Volts)

0.7

0.5

0.3

0.1
–20 40 120 125

–40 0 20 60 80 100–10 50–30 10 30 70 90 110

Temperature (°C)

Figure 1. Output Voltage vs. Temperature

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temperature slope is fixed at 10 mV/°C, and the output
voltage at 0°C is 500 mV.

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