NCT22 Datasheet, PDF (1/8 Pages) ON Semiconductor – Low Cost Single Trip Point Temperature Sensor

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
–
R_SET
Sensor
1 ^NCT22 7
NC V_DD
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 V_DD
6 N/C
5 T_SET
(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
1
June, 2002 – Rev. 1
Publication Order Number:
NCT22/D