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S-5841 Series
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© Seiko Instruments Inc., 2007-2015
TEMPERATURE SWITCH IC (THERMOSTAT IC)
Rev.2.2_00
The S-5841 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-5841 Series restores the output
voltage when the temperature drops to the level of release temperature.
The S-5841 Series operates at the lower power supply voltage of 2.2 V and its current consumption is 10 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 +100°C, +1°C step, detection accuracy: ±2.5°C
Low voltage operation:
VDD = 2.2 V min.
(Detection temperature = +55°C to +100°C, Ta = 40°C to +100°C)
Low current consumption:
IDD = 10 μA typ. (Ta = +25°C)
Hysteresis temperature can be switched in 0°C, 2°C, 4°C and 10°C.
Selectable output logic in active "H" or "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*1
*1. Refer to "Product Name Structure" for details.
Applications
Fan control
Air conditioning system
Various electronic devices
Packages
SOT-23-5
SNT-6A
Seiko Instruments Inc.
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TEMPERATURE SWITCH IC (THERMOSTAT IC)
S-5841 Series
Block Diagrams
1. CMOS output product
VDD
Temperature
sensor
+
Delay circuit
Logic circuit
(selectable)
Reference voltage
generation circuit
VSS
HYS1 HYS2*1
*1. The HYS2 pin is not equipped for SOT-23-5.
Figure 1
2. Nch open drain output product
VDD
RT
Temperature
sensor
+
Delay circuit
Logic circuit
(selectable)
Reference voltage
generation circuit
VSS
HYS1 HYS2*1
*1. The HYS2 pin is not equipped for SOT-23-5.
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-5841 Series
Product Name Structure
Users are able to select the option for hysteresis temperature, detection temperature, output form and logic, package for the
S-5841 Series.
1. Product name
1. 1 SOT-23-5
S-5841 x xx x - M5T1 x
Environmental code
U: Lead-free (Sn 100%), halogen-free
G: Lead-free (for details, please contact our sales office)
Package abbreviation and IC packing specifications*1
M5T1: SOT-23-5, Tape
Output form and Output logic*2
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)*3
40 to 100
When the detection temperature is +80°C, it is expressed as 80.
When the detection temperature is +100°C, it is expressed as A0.
Option*4
A: Hysteresis temperature switched in 2°C and 10°C
B: Hysteresis temperature switched in 4°C and 10°C
Product name
*1. Refer to the tape drawing.
*2. 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 in CMOS or Nch open drain.
*3. The detection temperature (TDET) can be set in the range of +40°C to +100°C at 1°C step.
*4. The hysteresis temperature is set by the HYS1 pin. By option, the hysteresis temperature of the product is
selectable in 2°C and 10°C / 4°C and 10°C.
Seiko Instruments Inc.
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