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S-5843A Series
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© Seiko Instruments Inc., 2009-2015
TEMPERATURE SWITCH IC (THERMOSTAT IC)
Rev.2.2_00
The S-5843A 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-5843A Series restores the output voltage
when the temperature drops to the level of release temperature.
The S-5843A Series operates at the lower power supply voltage of 1.65 V and its current consumption is 4.5 μA typ. due to
CMOS configuration.
A temperature sensor with the negative temperature coefficient, a reference voltage generation circuit, a comparator and a
delay circuit are integrated on one chip, and enclosed into the packages SOT-23-5 and SNT-6A.
Features
Detection temperature:
TDET = +40°C to +120°C, +1°C step, detection accuracy: ±2.5°C
Low voltage operation:
VDD = 1.65 V min.
Low current consumption:
IDD = 4.5 μA typ. (Ta = +25°C)
Hysteresis temperature:
selectable in 2°C, 4°C, 10°C or 20°C
Selectable output logic in active "H" or "L"
Selectable output form in CMOS or Nch open drain
Prevent functions for false detection operation and false release operation
Operation temperature range:
Lead-free, Sn 100%, halogen-free*1
Ta = 40°C to +125°C
*1. Refer to "Product Name Structure" for details.
Applications
Fan control
Air conditioning system
Mobile phone
Game console
Various electronic devices
Packages
SOT-23-5
SNT-6A
Seiko Instruments Inc.
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TEMPERATURE SWITCH IC (THERMOSTAT IC)
S-5843A Series
Block Diagrams
1. CMOS output product
VDD
Temperature
sensor
+
Delay circuit
Logic circuit
(selectable)
Reference voltage
generation circuit
VSS
2. Nch open drain output product
VDD
Figure 1
RT
Temperature
sensor
+
Delay circuit
Logic circuit
(selectable)
Reference voltage
generation circuit
VSS
Figure 2
RT
2 Seiko Instruments Inc.
Rev.2.2_00
DET
DET

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Rev.2.2_00
TEMPERATURE SWITCH IC (THERMOSTAT IC)
S-5843A Series
Product Name Structure
Users are able to select the detection temperature, output form and logic, hysteresis temperature and package for the
S-5843A Series.
1. Product name
1. 1 SOT-23-5
S-5843A xx x x - M5T1 x
Environmental code
U: Lead-free (Sn 100%), halogen-free
S: Lead-free, halogen-free
Package abbreviation and IC packing specifications*1
M5T1: SOT-23-5, Tape
Hysteresis temperature*2
A: 2°C
B: 4°C
C: 10°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 (TDET)*4
40 to 99, A0 to A9, B0 to B9, C0
1. 2 SNT-6A
S-5843A xx x x - I6T1 U
Environmental code
U: Lead-free (Sn 100%), halogen-free
Package abbreviation and IC packing specifications*1
I6T1: SNT-6A, Tape
Hysteresis temperature*2
A: 2°C
B: 4°C
C: 10°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 (TDET)*4
40 to 99, A0 to A9, B0 to B9, C0
*1. Refer to the tape drawing.
*2. Hysteresis temperature is selectable in 2°C, 4°C, 10°C or 20°C.
However, if the detection temperature is +40°C to +49°C, select hysteresis temperature in 2°C, 4°C or 10°C.
*3. The DET pin output can be selected the output logic in active "H" or "L".
The DET pin output can be selected the output form CMOS or Nch open drain.
*4. Detection temperature (TDET) can be set in the range of +40°C to +120°C at 1°C step.
40 to 99, when detection temperature is +40°C to +99°C
A0 to A9, when detection temperature is +100°C to +109°C
B0 to B9, when detection temperature is +110°C to +119°C
C0, when the detection temperature is +120°C
Seiko Instruments Inc.
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TEMPERATURE SWITCH IC (THERMOSTAT IC)
S-5843A Series
Rev.2.2_00
2. Packages
Package Name
SOT-23-5
SNT-6A
Table 1 Package Drawing Codes
Dimension
MP005-A-P-SD
PG006-A-P-SD
Tape
MP005-A-C-SD
PG006-A-C-SD
Reel
MP005-A-R-SD
PG006-A-R-SD
Land
PG006-A-L-SD
3. Product name list
3. 1 SOT-23-5
Table 2
Product Name
Detection
Temperature (TDET)
DET Pin Output Form
DET Pin Output Logic
Hysteresis
Temperature (THYS)
S-5843AC0DC-M5T1y
+120°C
Nch open drain
Active "L"
10°C
Remark 1. Please contact our sales office for products with specifications other than the above.
2. y: S or U
3. Please select products of environmental code = U for Sn 100%, halogen-free products.
3. 2 SNT-6A
Table 3
Product Name
Detection
Temperature (TDET)
DET Pin Output Form
DET Pin Output Logic
S-5843A80CC-I6T1U
+80°C
Nch open drain
Active "H"
S-5843A90CC-I6T1U
+90°C
Nch open drain
Active "H"
Remark Please contact our sales office for products with specifications other than the above.
Hysteresis
Temperature (THYS)
10°C
10°C
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Rev.2.2_00
Pin Configurations
1. SOT-23-5
Top view
54
123
Figure 3
2. SNT-6A
Top view
16
25
34
Figure 4
TEMPERATURE SWITCH IC (THERMOSTAT IC)
S-5843A Series
Table 4
Pin No.
1
Symbol
NC*1
Description
No connection
2 VSS
3 RT*2
GND pin
Test pin
4 VDD
Power supply pin
5 DET
Output pin
*1. The NC pin is electrically open.
The NC pin can be connected to VDD pin or VSS pin.
*2. Set the RT pin open in use.
Table 5
Pin No.
1
Symbol
RT*1
Test pin
Description
2 VSS
3 NC*2
GND pin
No connection
4 DET
5 NC*2
Output pin
No connection
6 VDD
Power supply pin
*1. Set the RT pin open in use.
*2. The NC pin is electrically open.
The NC pin can be connected to VDD pin or VSS pin.
Seiko Instruments Inc.
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