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PDF NCT52 Data sheet ( Hoja de datos )
| Número de pieza | NCT52 | |
| Descripción | Ultra Small Temperature Switch | |
| Fabricantes | ON Semiconductor | |
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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
1
2
3
4
SOT–23A
SN SUFFIX
CASE 1212
PIN CONNECTIONS
GND 1
GND 2
HYST 3
5 TOVER
(TOVER)*
4 VCC
*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
June, 2002 – Rev. 1
1
Publication Order Number:
NCT51/D
1 page  
NCT51, NCT52
+5 V
100 pF
HEAT
VCC
NCT52SN095
GND
TOVER
TEMPERATURE
FAULT
GND HYST
µP
HEAT
100 pF
FAN
CONTROL
VCC TOVER
HYST
NCT52SN055
GND GND
Figure 2. Fan Control Circuit with Over Temperature Alert
Positive
Tempco
Reference
+
-
Negative
Tempco
Reference
HYST
Network
NCT51
Positive
Tempco
Reference
+
-
Negative
Tempco
Reference
HYST
Network
NCT52
TOVER
V
TOVER
HYST
TOVER
COLD +25°C
V
TOVER
HYST
COLD +25°C
Figure 3. Functional Block Diagrams
NCT51
With 100 kΩ Pull–Up
TEMP
TTH HOT
NCT52
TEMP
TTH HOT
http://onsemi.com
5
5 Page 
NCT51, NCT52
PACKAGE DIMENSIONS
SOT–23
SN SUFFIX
CASE 1212–01
ISSUE O
A DB
A2
0.05 S
E
L1
54
12 3
e
e1
E1
B 5X
0.10 M C B S A S
C
C
A1
L
NOTES:
1. DIMENSIONS ARE IN MILLIMETERS.
2. INTERPRET DIMENSIONS AND TOLERANCES
PER ASME Y14.5M, 1994.
3. DATUM C IS A SEATING PLANE.
MILLIMETERS
DIM MIN MAX
A1 0.00 0.10
A2 1.00 1.30
B 0.30 0.50
C 0.10 0.25
D 2.80 3.00
E 2.50 3.10
E1 1.50 1.80
e 0.95 BSC
e1 1.90 BSC
L 0.20 ---
L1 0.45 0.75
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11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet NCT52.PDF ] | |
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