NCT24 Temperature Sensor Datasheet

NCT24 Datasheet, PDF, Equivalent


Part Number

NCT24

Description

Low Cost Single Trip Point Temperature Sensor

Manufacture

ON Semiconductor

Total Page 8 Pages
Datasheet
Download NCT24 Datasheet


NCT24
NCT22, NCT24
Low Cost Single Trip Point
Temperature Sensor
The NCT22 and NCT24 are programmable solid state temperature
sensors designed to replace mechanical switches in sensing and
control applications. Both devices integrate the temperature sensor
with a voltage reference and all required detector circuitry. The desired
temperature set point is set by the user with a single external resistor.
Ambient temperature is sensed and compared to the programmed
setpoint. The OUT and OUT outputs are driven to their active state
when the measured temperature exceeds the programmed setpoint.
The NCT22 has a power supply voltage range of 4.5 V to 18 V
while the NCT24 operates over a power supply range of 2.7 V to 4.5 V.
Both devices are useable over a temperature range of –40°C to
+125°C. Both devices feature low supply current making them
suitable for many portable applications.
The devices are offered in surface mount packages.
Features
Temperature Set Point Easily Programs with a Single External
Resistor
Operates with 2.7 V Power Supply (NCT24)
Small SOIC Package
Cost Effective
Applications
Power Supply Over–Temperature Detection
Consumer Electronics
Fire/Heat Detection
UPSs, Amplifiers, Motors
CPU Thermal Management in PCs
+
9V
Battery
RSET
Sensor
1 NCT22 7
NC VDD
5 TSET
8
NC
6 OUT 3
NC
4 GND OUT 2
+9 V
Sounder
CONTROL
ASIC
ALARM
http://onsemi.com
MARKING
DIAGRAM
8
1
SOIC–8
D SUFFIX
CASE 751
8
NCTxx
ALYW
1
xx = 22 or 24
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
PIN CONNECTIONS
N/C 1
OUT 2
OUT 3
GND 4
NCT22
NCT24
8 N/C
7 VDD
6 N/C
5 TSET
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 5 of this data sheet.
Figure 1. Heat Monitor for Smoke Detector
© Semiconductor Components Industries, LLC, 2002
June, 2002 – Rev. 1
1
Publication Order Number:
NCT22/D

NCT24
NCT22, NCT24
MAXIMUM RATINGS*
Rating
Symbol
Value
Unit
Supply Voltage
NCT22
NCT24
VCC
20
5.5
V
Input Voltage (Any Input)
– GND –0.3 to VDD +0.3 V
Operating Temperature Range
–40 to +125
°C
Maximum Junction Temperature
+150
°C
Storage Temperature Range
Tstg –65 to +150
°C
Lead Temperature (Soldering, 10 seconds)
+300
°C
*Stresses above those listed under “Absolute Maximum Ratings’’ may cause permanent damage to the device. These are stress ratings only
and functional operation of the device at these or any other conditions above those indicated in the operational sections of the specifications
is not implied. Exposure to Absolute Maximum Rating Conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS (Over Operating Temperature Range, unless otherwise specified)
Characteristics
Device
Test Conditions
Min Typ
Supply Voltage
Range
NCT22
NCT24
4.5 –
2.7 –
Supply Current
VOH
VOL
VOH
VOL
Absolute Accuracy
NCT22
NCT24
NCT22
NCT22
NCT24
NCT24
NCT22
NCT24
5.0 V v VDD v 18 V
2.7 V v VDD v 4.5 V
5.0 V v VDD v 18 V
–40°C v TA v +125°C
IOH = 250 µA
IOH = 500 µA
–40°C v TA v +85°C
IOL = 500 µA
IOL = 1.0 mA
–40°C v TA v +125°C
IOL = 1.0 mA
2.7 V v VDD v 4.5 V
–40°C v TA v +125°C
IOH = 250 µA
IOH = 500 µA
–40°C v TA v +85°C
IOL = 500 µA
IOL = 1.0 mA
–40°C v TA v +125°C
IOL = 1.0 mA
TSET = Programmed Temperature
TSET = Programmed Temperature
0.9 x VDD
0.8 x VDD
0.9 x VDD
0.8 x VDD
T–5
T–5
200
170
T"1
T"1
Trip Point Hysteresis
NCT22
NCT24
– 2.0
– 2.0
Max
18
4.5
600
300
0.15 x VDD
0.30 x VDD
0.35 x VDD
0.1 x VDD
0.2 x VDD
0.25 x VDD
T+5
T+5
Unit
V
µA
V
V
V
V
°C
°C
http://onsemi.com
2


Features NCT22, NCT24 Low Cost Single Trip Point Temperature Sensor The NCT22 and NCT24 are programmable solid state temperatu re sensors designed to replace mechanic al switches in sensing and control appl ications. Both devices integrate the te mperature sensor with a voltage referen ce and all required detector circuitry. The desired temperature set point is s et by the user with a single external r esistor. Ambient temperature is sensed and compared to the programmed setpoint . The OUT and OUT outputs are driven to their active state when the measured t emperature exceeds the programmed setpo int. The NCT22 has a power supply volta ge range of 4.5 V to 18 V while the NCT 24 operates over a power supply range o f 2.7 V to 4.5 V. Both devices are usea ble over a temperature range of –40° C to +125°C. Both devices feature low supply current making them suitable for many portable applications. The device s are offered in surface mount packages . Features • Temperature Set Point Easily Programs with a Single Ex.
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