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  • The STWD100 watchdog timer circuits are self-contained devices which prevent system failures that are caused by certain types of hardware errors (such as, non-responding peripherals and bus contention) or software errors (such as a bad code jump and a code stuck in loop).

    The STWD100 watchdog timer has an input, WDI, and an output, WDO. The input is used to clear the internal watchdog timer periodically within the specified timeout period, twd. While the system is operating correctly, it periodically toggles the watchdog input, WDI. If the system fails, the watchdog timer is not reset, a system alert is generated and the watchdog output, WDO, is asserted.
    The STWD100 circuit also has an enable pin, EN, which can enable or disable the watchdog functionality. The EN pin is connected to the internal pull-down resistor. The device is enabled if the EN pin is left floating.

    Key Features

    • Current consumption 13 µA typ.
    • Available watchdog timeout periods are 3.4 ms, 6.3 ms, 102 ms, and 1.6 s
    • Chip enable input
    • Open drain or push-pullWDO output
    • Operating temperature range: –40 to 125 °C
    • Packages: SOT23-5 and SC70-5 (SOT323-5)
    • ESD performance
      • HBM: 2000 V
      • RCDM: 1000 V
    • Automotive qualified

Circuit Diagram

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STWD100YNYWY3F SOT23-5L Tape And Reel -40 125
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STWD100NPWY3F SOT23-5L Tape And Reel -40 125
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EAR99 MALAYSIA 0.52 / 1k Get sample Check Availability

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STWD100YNWWY3F SOT23-5L Tape And Reel -40 125
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EAR99 MALAYSIA 0.92 / 1k Buy now Check Availability

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STWD100NWWY3F SOT23-5L Tape And Reel -40 125
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EAR99 MALAYSIA 0.517 / 1k Get sample Check Availability

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2020

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STWD100NYWY3F SOT23-5L Tape And Reel -40 125
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EAR99 MALAYSIA 0.52 / 1k Get sample Check Availability

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DIGIKEY WORLDWIDE 37514 1 Order Now
COMPEL EUROPE 1512 1 Order Now
RS COMPONENTS EUROPE 31160 5 Order Now
FUTURE WORLDWIDE 31969 1 Order Now
ARROW EUROPE 117000 0 Order Now
Newark Element14 AMERICA 721 0 Order Now
ARROW AMERICA 6000 3000 Order Now
MOUSER WORLDWIDE 11547 1 Order Now
Farnell Element14 EUROPE 8028 1 Order Now
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37514

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31160

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STWD100YNXWY3F SOT23-5L Tape And Reel - -
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EAR99 MALAYSIA 0.95 / 1k Buy now Check Availability

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DIGIKEY WORLDWIDE 1632 1 Order Now
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2593

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STWD100PYW83F SOT323-5L Tape And Reel -40 125
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EAR99 MALAYSIA 0.52 / 1k Get sample Check Availability

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DIGIKEY WORLDWIDE 7534 1 Order Now
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FUTURE WORLDWIDE 4494 1 Order Now
Newark Element14 AMERICA 90 0 Order Now
MOUSER WORLDWIDE 5694 1 Order Now
Farnell Element14 EUROPE 1687 1 Order Now

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5020

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1

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Stock

4494

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1

Region

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Newark Element14

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90

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5694

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1

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1687

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Distributor reported inventory date: 2020-03-24

STWD100YNPWY3F SOT23-5L Tape And Reel -40 125
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EAR99 MALAYSIA 0.62 / 1k Get sample Check Availability

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DIGIKEY WORLDWIDE 63 1 Order Now
RS COMPONENTS EUROPE 1420 1 Order Now
MOUSER WORLDWIDE 4187 1 Order Now
Farnell Element14 EUROPE 2710 1 Order Now

Distributor reported inventory date: 2020-03-24

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Stock

63

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Stock

1420

Min.Order

1

Region

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Stock

4187

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2710

Min.Order

1

Region

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Distributor reported inventory date: 2020-03-24

STWD100NXWY3F SOT23-5L Tape And Reel - -
Active
EAR99 MALAYSIA 0.85 Buy now Check Availability

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Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2968 1 Order Now
ARROW EUROPE 6 0 Order Now
MOUSER WORLDWIDE 2608 1 Order Now

Distributor reported inventory date: 2020-03-24

Distributor Name

DIGIKEY

Stock

2968

Min.Order

1

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WORLDWIDE Order Now

ARROW

Stock

6

Min.Order

0

Region

EUROPE Order Now

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Stock

2608

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-03-24

STWD100YNYWY3F

Package

SOT23-5L

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.88 / 1k

Distributor availability ofSTWD100YNYWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 3934 1 Order Now
RS COMPONENTS EUROPE 2870 1 Order Now
FUTURE WORLDWIDE 2297 1 Order Now
ARROW EUROPE 30100 0 Order Now
Newark Element14 AMERICA 1168 0 Order Now
ARROW AMERICA 3000 3000 Order Now
MOUSER WORLDWIDE 5687 1 Order Now
Farnell Element14 EUROPE 3020 1 Order Now
ANGLIA Live EUROPE 50 3000 Order Now

Distributor reported inventory date: 2020-03-24

Distributor Name

DIGIKEY

Stock

3934

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2870

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

2297

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

30100

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

1168

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

3000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

5687

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

3020

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

50

Min.Order

3000

Region

EUROPE Order Now

Distributor reported inventory date: 2020-03-24

Operating Temperature (°C)

(min)

-40

(max)

125

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.88 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

STWD100NPWY3F

Package

SOT23-5L

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.52 / 1k

Distributor availability ofSTWD100NPWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1504 1 Order Now
RS COMPONENTS EUROPE 6665 1 Order Now
Newark Element14 AMERICA 396 0 Order Now
ARROW AMERICA 3000 3000 Order Now
MOUSER WORLDWIDE 2518 1 Order Now
Farnell Element14 EUROPE 902 1 Order Now

Distributor reported inventory date: 2020-03-24

Distributor Name

DIGIKEY

Stock

1504

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

6665

Min.Order

1

Region

EUROPE Order Now

Newark Element14

Stock

396

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

3000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

2518

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

902

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-03-24

Operating Temperature (°C)

(min)

-40

(max)

125

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.52 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

STWD100YNWWY3F

Package

SOT23-5L

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.92 / 1k

Distributor availability ofSTWD100YNWWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 376 1 Order Now
RS COMPONENTS EUROPE 2590 1 Order Now
Newark Element14 AMERICA 750 0 Order Now
MOUSER WORLDWIDE 5957 1 Order Now

Distributor reported inventory date: 2020-03-24

Distributor Name

DIGIKEY

Stock

376

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2590

Min.Order

1

Region

EUROPE Order Now

Newark Element14

Stock

750

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

5957

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-03-24

Operating Temperature (°C)

(min)

-40

(max)

125

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.92 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

STWD100NWWY3F

Package

SOT23-5L

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.517 / 1k

Distributor availability ofSTWD100NWWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1060 1 Order Now
RS COMPONENTS EUROPE 2470 1 Order Now
MOUSER WORLDWIDE 1938 1 Order Now
Farnell Element14 EUROPE 2020 1 Order Now

Distributor reported inventory date: 2020-03-24

Distributor Name

DIGIKEY

Stock

1060

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

2470

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

1938

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2020

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-03-24

Operating Temperature (°C)

(min)

-40

(max)

125

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.517 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

STWD100NYWY3F

Package

SOT23-5L

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.52 / 1k

Distributor availability ofSTWD100NYWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 37514 1 Order Now
COMPEL EUROPE 1512 1 Order Now
RS COMPONENTS EUROPE 31160 5 Order Now
FUTURE WORLDWIDE 31969 1 Order Now
ARROW EUROPE 117000 0 Order Now
Newark Element14 AMERICA 721 0 Order Now
ARROW AMERICA 6000 3000 Order Now
MOUSER WORLDWIDE 11547 1 Order Now
Farnell Element14 EUROPE 8028 1 Order Now
ANGLIA Live EUROPE 345 1 Order Now

Distributor reported inventory date: 2020-03-24

Distributor Name

DIGIKEY

Stock

37514

Min.Order

1

Region

WORLDWIDE Order Now

COMPEL

Stock

1512

Min.Order

1

Region

EUROPE Order Now

RS COMPONENTS

Stock

31160

Min.Order

5

Region

EUROPE Order Now

FUTURE

Stock

31969

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

117000

Min.Order

0

Region

EUROPE Order Now

Newark Element14

Stock

721

Min.Order

0

Region

AMERICA Order Now

ARROW

Stock

6000

Min.Order

3000

Region

AMERICA Order Now

MOUSER

Stock

11547

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

8028

Min.Order

1

Region

EUROPE Order Now

ANGLIA Live

Stock

345

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-03-24

Operating Temperature (°C)

(min)

-40

(max)

125

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.52 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

STWD100YNXWY3F

Package

SOT23-5L

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.95 / 1k

Distributor availability ofSTWD100YNXWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1632 1 Order Now
MOUSER WORLDWIDE 2593 1 Order Now

Distributor reported inventory date: 2020-03-24

Distributor Name

DIGIKEY

Stock

1632

Min.Order

1

Region

WORLDWIDE Order Now

MOUSER

Stock

2593

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-03-24

Operating Temperature (°C)

(min)

-

(max)

-

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.95 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

STWD100PYW83F

Package

SOT323-5L

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.52 / 1k

Distributor availability ofSTWD100PYW83F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 7534 1 Order Now
RS COMPONENTS EUROPE 5020 1 Order Now
FUTURE WORLDWIDE 4494 1 Order Now
Newark Element14 AMERICA 90 0 Order Now
MOUSER WORLDWIDE 5694 1 Order Now
Farnell Element14 EUROPE 1687 1 Order Now

Distributor reported inventory date: 2020-03-24

Distributor Name

DIGIKEY

Stock

7534

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

5020

Min.Order

1

Region

EUROPE Order Now

FUTURE

Stock

4494

Min.Order

1

Region

WORLDWIDE Order Now

Newark Element14

Stock

90

Min.Order

0

Region

AMERICA Order Now

MOUSER

Stock

5694

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

1687

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-03-24

Operating Temperature (°C)

(min)

-40

(max)

125

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.52 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

STWD100YNPWY3F

Package

SOT23-5L

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.62 / 1k

Distributor availability ofSTWD100YNPWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 63 1 Order Now
RS COMPONENTS EUROPE 1420 1 Order Now
MOUSER WORLDWIDE 4187 1 Order Now
Farnell Element14 EUROPE 2710 1 Order Now

Distributor reported inventory date: 2020-03-24

Distributor Name

DIGIKEY

Stock

63

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1420

Min.Order

1

Region

EUROPE Order Now

MOUSER

Stock

4187

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2710

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-03-24

Operating Temperature (°C)

(min)

-40

(max)

125

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.62 / 1k

ECCN (US)

EAR99

Country of Origin

MALAYSIA

STWD100NXWY3F

Package

SOT23-5L

Packing Type

Tape And Reel

Approximate Price (US$)* / Qty

0.85

Distributor availability ofSTWD100NXWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2968 1 Order Now
ARROW EUROPE 6 0 Order Now
MOUSER WORLDWIDE 2608 1 Order Now

Distributor reported inventory date: 2020-03-24

Distributor Name

DIGIKEY

Stock

2968

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

6

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

2608

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-03-24

Operating Temperature (°C)

(min)

-

(max)

-

Marketing Status

Active

Budgetary Price (US$)* / Qty

0.85

ECCN (US)

EAR99

Country of Origin

MALAYSIA

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors

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Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STWD100NPWY3F
Active
SOT23-5L Industrial Ecopack3
STWD100NWWY3F
Active
SOT23-5L Industrial Ecopack3
STWD100NXWY3F
Active
SOT23-5L Industrial Ecopack3
STWD100NYWY3F
Active
SOT23-5L Industrial Ecopack3
STWD100PYW83F
Active
SOT323-5L Industrial Ecopack3
STWD100YNPWY3F
Active
SOT23-5L Automotive Ecopack3
STWD100YNWWY3F
Active
SOT23-5L Automotive Ecopack3
STWD100YNXWY3F
Active
SOT23-5L Automotive Ecopack3
STWD100YNYWY3F
Active
SOT23-5L Automotive Ecopack3

STWD100NPWY3F

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack3

STWD100NWWY3F

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack3

STWD100NXWY3F

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack3

STWD100NYWY3F

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack3

STWD100PYW83F

Package:

SOT323-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT323-5L

Grade

Industrial

RoHS Compliance Grade

Ecopack3

STWD100YNPWY3F

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Automotive

RoHS Compliance Grade

Ecopack3

STWD100YNWWY3F

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Automotive

RoHS Compliance Grade

Ecopack3

STWD100YNXWY3F

Package:

SOT23-5L

Material Declaration**:

Marketing Status

Active

Package

SOT23-5L

Grade

Automotive

RoHS Compliance Grade

Ecopack3

STWD100YNYWY3F

Package:

SOT23-5L

Material Declaration**:

PDF XML

Marketing Status

Active

Package

SOT23-5L

Grade

Automotive

RoHS Compliance Grade

Ecopack3

(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.

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