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S-5840B Series
www.sii-ic.com
TEMPERATURE SWITCH IC (THERMOSTAT IC) WITH LATCH
© Seiko Instruments Inc., 2007-2012
Rev.2.1_00
The S-5840B Series is a temperature switch IC (thermostat IC) with a latch function which detects the temperature with a
temperature accuracy of ±2.5°C. When the temperature reaches the detection temperature, the output signal is inverted and
being latched until the S-5840B Series detects decrease in a power supply voltage.
The S-5840B Series operates at the lower power supply voltage of 1.0 V and its current consumption is 12 μA typ. due to
CMOS configuration.
The S-5840B Series has a temperature sensor using negative temperature coefficient, a reference voltage generation
circuit, comparator, voltage detection circuit and noise suppression circuit on a chip, and they are enclosed in package
SOT-23-5.
„ Features
Detection temperature:
TDET = +55 to +95°C, +1°C step, detection accuracy: ±2.5°C
Wide voltage operation:
VDD = 1.0 V to 10.0 V
Release voltage:
VRET = 2.2 V to 3.4 V, 0.1 V step
Low current consumption:
IDD = 12 μA typ. (Ta = +25°C).
Built-in noise suppression circuit for preventing temperature detection malfunction
Output logic level is fixed by the latch after temperature detection.
Selectable output logic in active "H" or "L"
Selectable output form in CMOS or Nch open drain
Operation temperature range:
Ta = 40°C to +100°C
Lead-free, Sn 100%, halogen-free*1
*1. Refer to "„ Product Name Structure" for details.
„ Applications
Game console
Electronic device
„ Package
SOT-23-5
Seiko Instruments Inc.
1

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TEMPERATURE SWITCH IC (THERMOSTAT IC) WITH LATCH
S-5840B Series
„ Block Diagrams
1. CMOS output product
VDD
Temperature
sensor
+
VREF
Reference voltage
generation circuit
Voltage
detector
2. Nch open drain output product
VDD
VSS
Figure 1
DQ
D-F/F
CK R
RT
Temperature
sensor
+
VREF
Reference voltage
generation circuit
Voltage
detector
DQ
D-F/F
CK R
VSS
Figure 2
RT
Rev.2.1_00
CD
DET
CD
DET
2 Seiko Instruments Inc.

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Rev.2.1_00
TEMPERATURE SWITCH IC (THERMOSTAT IC) WITH LATCH
S-5840B Series
„ Product Name Structure
Users are able to select the option for detection temperature, output form and logic, release voltage for the S-5840B Series.
1. Product name
S-5840B xx - 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
Option*2
*1. Refer to the tape drawing.
*2. Option list
The detection temperature (TDET) can be set in the range of +55°C to +95° at 1°C step.
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.
The release voltage (VRET) can be set in the range of 2.2 V to 3.4 V at 0.1 V step.
2. Package
Package Name
SOT-23-5
Table 1 Package Drawing Codes
Dimension
MP005-A-P-SD
Tape
MP005-A-C-SD
Reel
MP005-A-R-SD
3. Product name list
Table 2
Product Name
S-5840BAG-M5T1x
Detection Temperature
DET Pin Output Form DET Pin Output Logic
(TDET)
+60°C
CMOS
Active "L"
Release Voltage
(VRET)
2.9 V
S-5840BAH-M5T1x
+90°C
CMOS
Active "H"
2.9 V
S-5840BAJ-M5T1x
+80°C
Nch open drain
Active "L"
2.2 V
Remark 1. Please contact our sales office for options other than that specified above.
2. x: G or U
3. Please select products of environmental code = U for Sn 100%, halogen-free products.
Seiko Instruments Inc.
3