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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

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STWD100YNWWY3F

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STWD100NWWY3F

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Operating Temperature (°C)

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Unit Price (US$)

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ECCN (US)

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STWD100NYWY3F

Package

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0.52*

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(max)

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Marketing Status

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Unit Price (US$)

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Quantity

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ECCN (US)

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STWD100YNXWY3F

Package

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Packing Type

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Unit Price (US$)

0.621*

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Operating Temperature (°C)

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-

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Unit Price (US$)

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Quantity

1000

ECCN (US)

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Country of Origin

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STWD100PYW83F

Package

SOT323-5L

Packing Type

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Unit Price (US$)

0.52*

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5040

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Stock

4494

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5824

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Stock

2636

Min.Order

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Distributor reported inventory date: 2020-02-16

Operating Temperature (°C)

(min)

-40

(max)

125

Marketing Status

Active

Unit Price (US$)

0.52

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

STWD100YNPWY3F

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

0.62*

Distributor availability ofSTWD100YNPWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 63 1 Order Now
RS COMPONENTS EUROPE 1440 1 Order Now
MOUSER WORLDWIDE 4202 1 Order Now
Farnell Element14 EUROPE 2712 1 Order Now

Distributor reported inventory date: 2020-02-16

Distributor Name

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Stock

63

Min.Order

1

Region

WORLDWIDE Order Now

RS COMPONENTS

Stock

1440

Min.Order

1

Region

EUROPE Order Now

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Stock

4202

Min.Order

1

Region

WORLDWIDE Order Now

Farnell Element14

Stock

2712

Min.Order

1

Region

EUROPE Order Now

Distributor reported inventory date: 2020-02-16

Operating Temperature (°C)

(min)

-40

(max)

125

Marketing Status

Active

Unit Price (US$)

0.62

Quantity

1000

ECCN (US)

EAR99

Country of Origin

MALAYSIA

STWD100NXWY3F

Package

SOT23-5L

Packing Type

Tape And Reel

Unit Price (US$)

*

Distributor availability ofSTWD100NXWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2973 1 Order Now
ARROW EUROPE 18 0 Order Now
MOUSER WORLDWIDE 3456 1 Order Now

Distributor reported inventory date: 2020-02-16

Distributor Name

DIGIKEY

Stock

2973

Min.Order

1

Region

WORLDWIDE Order Now

ARROW

Stock

18

Min.Order

0

Region

EUROPE Order Now

MOUSER

Stock

3456

Min.Order

1

Region

WORLDWIDE Order Now

Distributor reported inventory date: 2020-02-16

Operating Temperature (°C)

(min)

-

(max)

-

Marketing Status

Active

Unit Price (US$)

-

Quantity

-

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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