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Seiko Instruments Electronic Components Datasheet

S-5843A Datasheet

TEMPERATURE SWITCH IC

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S-5843A pdf
S-5843A Series
www.sii-ic.com
© 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.
1



Seiko Instruments Electronic Components Datasheet

S-5843A Datasheet

TEMPERATURE SWITCH IC

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S-5843A pdf
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



Seiko Instruments Electronic Components Datasheet

S-5843A Datasheet

TEMPERATURE SWITCH IC

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S-5843A pdf
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.
3




Part Number S-5843A
Description TEMPERATURE SWITCH IC
Maker Seiko Instruments
Total Page 21 Pages
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