NCT51 Datasheet, PDF (1/12 Pages) ON Semiconductor – Ultra Small Temperature Switch with Pin-Selectable Hysteresis

NCT51, NCT52
Ultra Small Temperature
Switch with Pin-Selectable
Hysteresis
The NCT51 and NCT52 are SOT–23 temperature switches that
require no external components and the design is facilitated with
factory–programmed temperature thresholds. A choice of
factory–trimmed temperature trip points are available. Pin selectable
hysteresis of +2°C or +10°C allows flexibility to the design. These
parts typically consume only 17 µA of current and operate over the
entire –55°C to +125°C temperature range while offering accuracies
of "0.5°C (typ) and "4°C (max).
The NCT51 has an open drain, active low output, meant for
microprocessor reset control. The NCT52 has a CMOS, active high
output designed to drive a logic level MOSFET to turn on a fan or
heater element.
The NCT51/NCT52 are aimed for hot–temperature monitoring
(+45°C to +115°C). These devices assert a logic signal when the
temperature goes above the threshold.
The NCT51 and NCT52 are offered in three standard temperature
thresholds. Available in 5–Pin SOT–23A packages, these parts are
ideal for applications requiring high integration, small size, low power
and low installed cost.
Features
• 5–Pin SOT–23A
• Factory–Programmed Thresholds from +45°C to +115°C in 10°C
Increments
• Pin–Selectable +2°C or +10°C Hysteresis
• "0.5°C (Typ) Threshold Accuracy Over Full Temperature Range
• No External Components Required
• 17 µA Supply Current
Typical Applications
• Thermal Management in PCs and Servers
• Over Temperature Fail Safe Circuits
• Simple Fan Controller
• Temperature Alarms
• Projectors/Printers
• Notebook Computers
• Network Boxes
http://onsemi.com
5
4
1
2
3
SOT–23A
SN SUFFIX
CASE 1212
PIN CONNECTIONS
GND ¹
GND 2
HYST ³
5 ^TOVER
(T_OVER)*
4 V_CC
*For NCT52
Note: 5–Pin SOT–23A is equivalent to EIAJ SC–74A
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 9 of this data sheet.
© Semiconductor Components Industries, LLC, 2002
1
June, 2002 – Rev. 1
Publication Order Number:
NCT51/D