STWD100

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Watchdog timer circuit

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Product overview

Description

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.
  • All 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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STMicroelectronics - STWD100

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Quality and Reliability

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**:

PDF XML

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.

Sample & Buy

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Part Number
Order from distributors
Order from ST
Marketing Status
ECCN (US)
ECCN (EU)
Packing Type
Package
Temperature (°C) Country of Origin
Budgetary Price (US$)*/Qty
min
max
STWD100YNYWY3F Available at 2 distributors

Distributor availability ofSTWD100YNYWY3F

Distributor Name
Region Stock Min. Order Third party link
YOSUN ASIA/PACIFIC 200 1 Buy from Distributor
ANGLIA Live EUROPE 7 1 Buy from Distributor

Distributor reported inventory date: 2022-06-30

Distributor Name

YOSUN

Stock

200

Min.Order

1

Region

ASIA/PACIFIC Buy from Distributor

ANGLIA Live

Stock

7

Min.Order

1

Distributor reported inventory date: 2022-06-30

Active
EAR99 NEC Tape and Reel SOT23-5L -40 125 MALAYSIA
STWD100NPWY3F Available at 3 distributors

Distributor availability ofSTWD100NPWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 39 1 Buy from Distributor
RS COMPONENTS EUROPE 11550 1 Buy from Distributor
MOUSER WORLDWIDE 1094 1 Buy from Distributor

Distributor reported inventory date: 2022-06-30

Distributor Name

DIGIKEY

Stock

39

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

11550

Min.Order

1

MOUSER

Stock

1094

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-06-30

Active
EAR99 NEC Tape and Reel SOT23-5L -40 125 MALAYSIA
STWD100YNWWY3F Available at 1 distributors

Distributor availability ofSTWD100YNWWY3F

Distributor Name
Region Stock Min. Order Third party link
YOSUN ASIA/PACIFIC 200 1 Buy from Distributor

Distributor reported inventory date: 2022-06-30

Distributor Name

YOSUN

Stock

200

Min.Order

1

Region

ASIA/PACIFIC Buy from Distributor

Distributor reported inventory date: 2022-06-30

Active
EAR99 NEC Tape and Reel SOT23-5L -40 125 MALAYSIA
STWD100NWWY3F Available at 2 distributors

Distributor availability ofSTWD100NWWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2400 1 Buy from Distributor
YOSUN ASIA/PACIFIC 200 1 Buy from Distributor

Distributor reported inventory date: 2022-06-30

Distributor Name

DIGIKEY

Stock

2400

Min.Order

1

Region

WORLDWIDE Buy from Distributor

YOSUN

Stock

200

Min.Order

1

Region

ASIA/PACIFIC Buy from Distributor

Distributor reported inventory date: 2022-06-30

Active
EAR99 NEC Tape and Reel SOT23-5L -40 125 CHINA
STWD100NYWY3F Available at 6 distributors

Distributor availability ofSTWD100NYWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 117 1 Buy from Distributor
YOSUN ASIA/PACIFIC 200 1 Buy from Distributor
COMPEL EUROPE 739 1 Buy from Distributor
RS COMPONENTS EUROPE 895 5 Buy from Distributor
Newark Element14 AMERICA 3799 0 Buy from Distributor
ANGLIA Live EUROPE 126580 1 Buy from Distributor

Distributor reported inventory date: 2022-06-30

Distributor Name

DIGIKEY

Stock

117

Min.Order

1

Region

WORLDWIDE Buy from Distributor

YOSUN

Stock

200

Min.Order

1

Region

ASIA/PACIFIC Buy from Distributor

COMPEL

Stock

739

Min.Order

1

RS COMPONENTS

Stock

895

Min.Order

5

Newark Element14

Stock

3799

Min.Order

0

Region

AMERICA Buy from Distributor

ANGLIA Live

Stock

126580

Min.Order

1

Distributor reported inventory date: 2022-06-30

Active
EAR99 NEC Tape and Reel SOT23-5L -40 125 CHINA
STWD100YNXWY3F No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape and Reel SOT23-5L - - MALAYSIA
STWD100PYW83F No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape and Reel SOT323-5L -40 125 MALAYSIA
STWD100YNPWY3F Available at 1 distributors

Distributor availability ofSTWD100YNPWY3F

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 271 1 Buy from Distributor

Distributor reported inventory date: 2022-06-30

Distributor Name

MOUSER

Stock

271

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-06-30

Active
EAR99 NEC Tape and Reel SOT23-5L -40 125 MALAYSIA
STWD100NXWY3F Available at 1 distributors

Distributor availability ofSTWD100NXWY3F

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 1308 1 Buy from Distributor

Distributor reported inventory date: 2022-06-30

Distributor Name

MOUSER

Stock

1308

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-06-30

Active
EAR99 NEC Tape and Reel SOT23-5L - - CHINA

STWD100YNYWY3F Active

Package:
SOT23-5L
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

STWD100YNYWY3F

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

125

Country of Origin:

MALAYSIA

Distributor availability ofSTWD100YNYWY3F

Distributor Name
Region Stock Min. Order Third party link
YOSUN ASIA/PACIFIC 200 1 Buy from Distributor
ANGLIA Live EUROPE 7 1 Buy from Distributor

Distributor reported inventory date: 2022-06-30

Distributor Name

YOSUN

Stock

200

Min.Order

1

Region

ASIA/PACIFIC Buy from Distributor

ANGLIA Live

Stock

7

Min.Order

1

Distributor reported inventory date: 2022-06-30

STWD100NPWY3F Active

Package:
SOT23-5L
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

STWD100NPWY3F

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

125

Country of Origin:

MALAYSIA

Distributor availability ofSTWD100NPWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 39 1 Buy from Distributor
RS COMPONENTS EUROPE 11550 1 Buy from Distributor
MOUSER WORLDWIDE 1094 1 Buy from Distributor

Distributor reported inventory date: 2022-06-30

Distributor Name

DIGIKEY

Stock

39

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

11550

Min.Order

1

MOUSER

Stock

1094

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-06-30

STWD100YNWWY3F Active

Package:
SOT23-5L
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

STWD100YNWWY3F

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

125

Country of Origin:

MALAYSIA

Distributor availability ofSTWD100YNWWY3F

Distributor Name
Region Stock Min. Order Third party link
YOSUN ASIA/PACIFIC 200 1 Buy from Distributor

Distributor reported inventory date: 2022-06-30

Distributor Name

YOSUN

Stock

200

Min.Order

1

Region

ASIA/PACIFIC Buy from Distributor

Distributor reported inventory date: 2022-06-30

STWD100NWWY3F Active

Package:
SOT23-5L
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

STWD100NWWY3F

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

125

Country of Origin:

CHINA

Distributor availability ofSTWD100NWWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 2400 1 Buy from Distributor
YOSUN ASIA/PACIFIC 200 1 Buy from Distributor

Distributor reported inventory date: 2022-06-30

Distributor Name

DIGIKEY

Stock

2400

Min.Order

1

Region

WORLDWIDE Buy from Distributor

YOSUN

Stock

200

Min.Order

1

Region

ASIA/PACIFIC Buy from Distributor

Distributor reported inventory date: 2022-06-30

STWD100NYWY3F Active

Package:
SOT23-5L
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

STWD100NYWY3F

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

125

Country of Origin:

CHINA

Distributor availability ofSTWD100NYWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 117 1 Buy from Distributor
YOSUN ASIA/PACIFIC 200 1 Buy from Distributor
COMPEL EUROPE 739 1 Buy from Distributor
RS COMPONENTS EUROPE 895 5 Buy from Distributor
Newark Element14 AMERICA 3799 0 Buy from Distributor
ANGLIA Live EUROPE 126580 1 Buy from Distributor

Distributor reported inventory date: 2022-06-30

Distributor Name

DIGIKEY

Stock

117

Min.Order

1

Region

WORLDWIDE Buy from Distributor

YOSUN

Stock

200

Min.Order

1

Region

ASIA/PACIFIC Buy from Distributor

COMPEL

Stock

739

Min.Order

1

RS COMPONENTS

Stock

895

Min.Order

5

Newark Element14

Stock

3799

Min.Order

0

Region

AMERICA Buy from Distributor

ANGLIA Live

Stock

126580

Min.Order

1

Distributor reported inventory date: 2022-06-30

STWD100YNXWY3F Active

Package:
SOT23-5L
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

STWD100YNXWY3F

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-

Max:

-

Country of Origin:

MALAYSIA

No availability of distributors reported, please contact our sales office

STWD100PYW83F Active

Package:
SOT323-5L
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

STWD100PYW83F

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

125

Country of Origin:

MALAYSIA

No availability of distributors reported, please contact our sales office

STWD100YNPWY3F Active

Package:
SOT23-5L
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

STWD100YNPWY3F

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-40

Max:

125

Country of Origin:

MALAYSIA

Distributor availability ofSTWD100YNPWY3F

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 271 1 Buy from Distributor

Distributor reported inventory date: 2022-06-30

Distributor Name

MOUSER

Stock

271

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-06-30

STWD100NXWY3F Active

Package:
SOT23-5L
ECCN (US):
EAR99
Budgetary Price (US$)*/Qty:
-

Part Number:

STWD100NXWY3F

ECCN (EU):

NEC

Packing Type:

Tape and Reel

Operating Temperature (°C)

Min:

-

Max:

-

Country of Origin:

CHINA

Distributor availability ofSTWD100NXWY3F

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 1308 1 Buy from Distributor

Distributor reported inventory date: 2022-06-30

Distributor Name

MOUSER

Stock

1308

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2022-06-30

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