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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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