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S-5844A Series
www.sii-ic.com
© Seiko Instruments Inc., 2011-2014
TEMPERATURE SWITCH IC (THERMOSTAT IC)
Rev.2.6_00
The S-5844A Series is a temperature switch IC (thermostat IC) which detects the temperature with a temperature accuracy of
±2.5°C. The output inverts when temperature reaches the detection temperature. The S-5844A Series restores the output
voltage when the temperature drops to the level of release temperature.
The S-5844A Series operates at the lower power supply voltage of 1.65 V and its current consumption is 0.18 μA typ. due to
CMOS configuration.
A temperature sensor with the negative temperature coefficient, a reference voltage generation circuit and a comparator are
integrated on one chip, and enclosed into the packages SOT-23-5 and SNT-4A, and the super-small package HSNT-4 (1010).
Features
Detection temperature:
TDET = +50°C to +100°C, +5°C step, detection accuracy: ±2.5°C
Low voltage operation:
VDD = 1.65 V min.
Low current consumption:
IDD = 0.18 μA typ. (Ta = +25°C)
Hysteresis temperature:
selectable in 5°C, 10°C, 15°C or 20°C
Selectable output logic in active "H" or active "L"
Selectable output form in CMOS or Nch open-drain
Operation temperature range:
Ta = 40°C to +125°C
Lead-free (Sn 100%), halogen-free
Applications
Fan control
Air conditioning system
Mobile phone
Game console
Various electronic devices
Packages
SOT-23-5
SNT-4A
HSNT-4 (1010)
Seiko Instruments Inc.
1

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TEMPERATURE SWITCH IC (THERMOSTAT IC)
S-5844A Series
Block Diagrams
1. CMOS output product
VDD
Temperature
sensor
+ Logic circuit
(selectable)
Reference voltage
generation circuit
TEST
2. Nch open-drain output product
VDD
Figure 1
VSS
Temperature
sensor
+ Logic circuit
(selectable)
Reference voltage
generation circuit
TEST
Figure 2
VSS
Rev.2.6_00
DET
DET
2 Seiko Instruments Inc.

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Rev.2.6_00
TEMPERATURE SWITCH IC (THERMOSTAT IC)
S-5844A Series
Product Name Structure
Users are able to select the detection temperature, output form and logic, hysteresis temperature, and package for the
S-5844A Series.
1. Product name
S-5844A xx x x - xxxx U 3
Environmental code
U: Lead-free (Sn 100%), halogen-free
Package abbreviation and IC packing specifications*1
M5T1: SOT-23-5, Tape
I4T1: SNT-4A, Tape
A4T2: HSNT-4 (1010), Tape
Hysteresis temperature*2
A: 5°C
B: 10°C
C: 15°C
D: 20°C
Output form and output logic*3
A: CMOS output, active "H"
B: CMOS output, active "L"
C: Nch open-drain output, active "H"
D: Nch open-drain output, active "L"
Detection temperature*4
50 to 95, A0
(When detection temperature is +80°C, it is expressed as 80.
When detection temperature is +100°C, it is expressed as A0.)
*1. Refer to the tape drawing.
*2. The hysteresis temperature is selectable in 5°C, 10°C, 15°C, or 20°C.
However, if the detection temperature is +50°C, select the hysteresis temperature in 5°C or 10°C.
*3. For the DET pin output, selectable the output logic active "H" or active "L".
For the DET pin output, selectable the output form CMOS or Nch open-drain.
*4. Detection temperature (TDET) is settable in +50°C to +100°C, in +5°C step.
2. Packages
Package Name
SOT-23-5
SNT-4A
HSNT-4 (1010)
Table 1 Package Drawing Codes
Dimension
MP005-A-P-SD
PF004-A-P-SD
PL004-A-P-SD
Tape
MP005-A-C-SD
PF004-A-C-SD
PL004-A-C-SD
Reel
MP005-A-R-SD
PF004-A-R-SD
PL004-A-R-SD
Land
PF004-A-L-SD
PL004-A-L-SD
Seiko Instruments Inc.
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TEMPERATURE SWITCH IC (THERMOSTAT IC)
S-5844A Series
Rev.2.6_00
3. Product name list
3. 1 SOT-23-5
Table 2
Product Name
Detection
Temperature
(TDET)
DET Pin Output Form DET Pin Output Logic
S-5844A50DB-M5T1U3
S-5844A55CB-M5T1U3
S-5844A55CC-M5T1U3
S-5844A55CD-M5T1U3
S-5844A55DB-M5T1U3
S-5844A60CB-M5T1U3
S-5844A60CC-M5T1U3
S-5844A60CD-M5T1U3
S-5844A60DB-M5T1U3
S-5844A65CB-M5T1U3
S-5844A65CC-M5T1U3
S-5844A65CD-M5T1U3
S-5844A65DA-M5T1U3
S-5844A65DB-M5T1U3
S-5844A70CB-M5T1U3
S-5844A70CC-M5T1U3
S-5844A70CD-M5T1U3
S-5844A70DB-M5T1U3
S-5844A75CB-M5T1U3
S-5844A75CC-M5T1U3
S-5844A75CD-M5T1U3
S-5844A75DB-M5T1U3
S-5844A80CB-M5T1U3
S-5844A80CC-M5T1U3
S-5844A80CD-M5T1U3
S-5844A80DB-M5T1U3
S-5844A85CB-M5T1U3
S-5844A85CC-M5T1U3
S-5844A85CD-M5T1U3
S-5844A85DB-M5T1U3
S-5844A90CB-M5T1U3
S-5844A90CC-M5T1U3
S-5844A90CD-M5T1U3
S-5844A90DB-M5T1U3
S-5844A95CB-M5T1U3
S-5844A95CC-M5T1U3
S-5844A95CD-M5T1U3
S-5844A95DB-M5T1U3
+50°C
+55°C
+55°C
+55°C
+55°C
+60°C
+60°C
+60°C
+60°C
+65°C
+65°C
+65°C
+65°C
+65°C
+70°C
+70°C
+70°C
+70°C
+75°C
+75°C
+75°C
+75°C
+80°C
+80°C
+80°C
+80°C
+85°C
+85°C
+85°C
+85°C
+90°C
+90°C
+90°C
+90°C
+95°C
+95°C
+95°C
+95°C
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Remark Please contact our sales office for products with specifications other than the above.
Hysteresis
Temperature
(THYS)
10°C
10°C
15°C
20°C
10°C
10°C
15°C
20°C
10°C
10°C
15°C
20°C
5°C
10°C
10°C
15°C
20°C
10°C
10°C
15°C
20°C
10°C
10°C
15°C
20°C
10°C
10°C
15°C
20°C
10°C
10°C
15°C
20°C
10°C
10°C
15°C
20°C
10°C
4 Seiko Instruments Inc.

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Rev.2.6_00
TEMPERATURE SWITCH IC (THERMOSTAT IC)
S-5844A Series
3. 2 SNT-4A
Table 3
Product Name
Detection
Temperature
(TDET)
DET Pin Output Form DET Pin Output Logic
S-5844A50DB-I4T1U3
S-5844A55CB-I4T1U3
S-5844A55CC-I4T1U3
S-5844A55CD-I4T1U3
S-5844A55DB-I4T1U3
S-5844A60CB-I4T1U3
S-5844A60CC-I4T1U3
S-5844A60CD-I4T1U3
S-5844A60DB-I4T1U3
S-5844A65CB-I4T1U3
S-5844A65CC-I4T1U3
S-5844A65CD-I4T1U3
S-5844A65DB-I4T1U3
S-5844A70CB-I4T1U3
S-5844A70CC-I4T1U3
S-5844A70CD-I4T1U3
S-5844A70DB-I4T1U3
S-5844A75CB-I4T1U3
S-5844A75CC-I4T1U3
S-5844A75CD-I4T1U3
S-5844A75DB-I4T1U3
S-5844A80CB-I4T1U3
S-5844A80CC-I4T1U3
S-5844A80CD-I4T1U3
S-5844A80DB-I4T1U3
S-5844A85CB-I4T1U3
S-5844A85CC-I4T1U3
S-5844A85CD-I4T1U3
S-5844A85DB-I4T1U3
S-5844A90CB-I4T1U3
S-5844A90CC-I4T1U3
S-5844A90CD-I4T1U3
S-5844A90DB-I4T1U3
S-5844A95CB-I4T1U3
S-5844A95CC-I4T1U3
S-5844A95CD-I4T1U3
S-5844A95DB-I4T1U3
+50°C
+55°C
+55°C
+55°C
+55°C
+60°C
+60°C
+60°C
+60°C
+65°C
+65°C
+65°C
+65°C
+70°C
+70°C
+70°C
+70°C
+75°C
+75°C
+75°C
+75°C
+80°C
+80°C
+80°C
+80°C
+85°C
+85°C
+85°C
+85°C
+90°C
+90°C
+90°C
+90°C
+95°C
+95°C
+95°C
+95°C
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Nch open-drain
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Active "H"
Active "H"
Active "H"
Active "L"
Remark Please contact our sales office for products with specifications other than the above.
Hysteresis
Temperature
(THYS)
10°C
10°C
15°C
20°C
10°C
10°C
15°C
20°C
10°C
10°C
15°C
20°C
10°C
10°C
15°C
20°C
10°C
10°C
15°C
20°C
10°C
10°C
15°C
20°C
10°C
10°C
15°C
20°C
10°C
10°C
15°C
20°C
10°C
10°C
15°C
20°C
10°C
Seiko Instruments Inc.
5