STWD100

Active

Watchdog timer circuit

Download datasheet Order Direct
Overview
Online design
Sample & Buy
Solutions
Documentation
CAD Resources
Tools & Software
Quality & Reliability
Partner products
Sales Briefcase

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

EDA Symbols, Footprints and 3D Models

STMicroelectronics - STWD100

Speed up your design by downloading all the EDA symbols, footprints and 3D models for your application. You have access to a large number of CAD formats to fit with your design toolchain.

Symbols

Symbols

Footprints

Footprints

3D model

3D models

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

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 1 distributors

Distributor availability ofSTWD100YNYWY3F

Distributor Name
Region Stock Min. Order Third party link
ANGLIA Live EUROPE 11925 1 Buy from Distributor

Distributor reported inventory date: 2021-10-11

Distributor Name

ANGLIA Live

Stock

11925

Min.Order

1

Distributor reported inventory date: 2021-10-11

Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 MALAYSIA 0.682 / 1k
STWD100NPWY3F No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 MALAYSIA 0.572 / 1k
STWD100YNWWY3F Available at 1 distributors

Distributor availability ofSTWD100YNWWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 778 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

778

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-16

Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 MALAYSIA 0.6831 / 1k
STWD100NWWY3F Available at 2 distributors

Distributor availability ofSTWD100NWWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 437 1 Buy from Distributor
MOUSER WORLDWIDE 1923 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

437

Min.Order

1

Region

WORLDWIDE Buy from Distributor

MOUSER

Stock

1923

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-16

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 CHINA 0.5687 / 1k
STWD100NYWY3F Available at 3 distributors

Distributor availability ofSTWD100NYWY3F

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 320 1 Buy from Distributor
Farnell Element14 EUROPE 532 1 Buy from Distributor
ANGLIA Live EUROPE 29000 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

MOUSER

Stock

320

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

532

Min.Order

1

ANGLIA Live

Stock

29000

Min.Order

1

Distributor reported inventory date: 2021-10-16

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 CHINA 0.572 / 1k
STWD100YNXWY3F Available at 2 distributors

Distributor availability ofSTWD100YNXWY3F

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 111 1 Buy from Distributor
Farnell Element14 EUROPE 3000 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

MOUSER

Stock

111

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

3000

Min.Order

1

Distributor reported inventory date: 2021-10-16

Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L - - MALAYSIA 0.6831 / 1k
STWD100PYW83F Available at 4 distributors

Distributor availability ofSTWD100PYW83F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1319 1 Buy from Distributor
RS COMPONENTS EUROPE 40 1 Buy from Distributor
Newark Element14 AMERICA 74 0 Buy from Distributor
Farnell Element14 EUROPE 850 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

1319

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

40

Min.Order

1

Newark Element14

Stock

74

Min.Order

0

Region

AMERICA Buy from Distributor

Farnell Element14

Stock

850

Min.Order

1

Distributor reported inventory date: 2021-10-16

Active
EAR99 NEC Tape And Reel SOT323-5L -40 125 MALAYSIA 0.572 / 1k
STWD100YNPWY3F Available at 1 distributors

Distributor availability ofSTWD100YNPWY3F

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 91 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

MOUSER

Stock

91

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-16

Free Sample Buy Direct
Active
EAR99 NEC Tape And Reel SOT23-5L -40 125 MALAYSIA 0.682 / 1k
STWD100NXWY3F No availability of distributors reported, please contact our sales office
Active
EAR99 NEC Tape And Reel SOT23-5L - - CHINA

STWD100YNYWY3F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.682 / 1k

Distributor availability ofSTWD100YNYWY3F

Distributor Name
Region Stock Min. Order Third party link
ANGLIA Live EUROPE 11925 1 Buy from Distributor

Distributor reported inventory date: 2021-10-11

Distributor Name

ANGLIA Live

Stock

11925

Min.Order

1

Distributor reported inventory date: 2021-10-11

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Budgetary Price (US$)* / Qty

0.682 / 1k

Country of Origin

MALAYSIA

STWD100NPWY3F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.572 / 1k

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Budgetary Price (US$)* / Qty

0.572 / 1k

Country of Origin

MALAYSIA

STWD100YNWWY3F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.6831 / 1k

Distributor availability ofSTWD100YNWWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 778 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

778

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-16

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Budgetary Price (US$)* / Qty

0.6831 / 1k

Country of Origin

MALAYSIA

STWD100NWWY3F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.5687 / 1k

Distributor availability ofSTWD100NWWY3F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 437 1 Buy from Distributor
MOUSER WORLDWIDE 1923 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

437

Min.Order

1

Region

WORLDWIDE Buy from Distributor

MOUSER

Stock

1923

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-16

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Budgetary Price (US$)* / Qty

0.5687 / 1k

Country of Origin

CHINA

STWD100NYWY3F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.572 / 1k

Distributor availability ofSTWD100NYWY3F

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 320 1 Buy from Distributor
Farnell Element14 EUROPE 532 1 Buy from Distributor
ANGLIA Live EUROPE 29000 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

MOUSER

Stock

320

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

532

Min.Order

1

ANGLIA Live

Stock

29000

Min.Order

1

Distributor reported inventory date: 2021-10-16

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Budgetary Price (US$)* / Qty

0.572 / 1k

Country of Origin

CHINA

STWD100YNXWY3F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.6831 / 1k

Distributor availability ofSTWD100YNXWY3F

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 111 1 Buy from Distributor
Farnell Element14 EUROPE 3000 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

MOUSER

Stock

111

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Farnell Element14

Stock

3000

Min.Order

1

Distributor reported inventory date: 2021-10-16

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

0.6831 / 1k

Country of Origin

MALAYSIA

STWD100PYW83F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.572 / 1k

Distributor availability ofSTWD100PYW83F

Distributor Name
Region Stock Min. Order Third party link
DIGIKEY WORLDWIDE 1319 1 Buy from Distributor
RS COMPONENTS EUROPE 40 1 Buy from Distributor
Newark Element14 AMERICA 74 0 Buy from Distributor
Farnell Element14 EUROPE 850 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

DIGIKEY

Stock

1319

Min.Order

1

Region

WORLDWIDE Buy from Distributor

RS COMPONENTS

Stock

40

Min.Order

1

Newark Element14

Stock

74

Min.Order

0

Region

AMERICA Buy from Distributor

Farnell Element14

Stock

850

Min.Order

1

Distributor reported inventory date: 2021-10-16

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT323-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Budgetary Price (US$)* / Qty

0.572 / 1k

Country of Origin

MALAYSIA

STWD100YNPWY3F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

0.682 / 1k

Distributor availability ofSTWD100YNPWY3F

Distributor Name
Region Stock Min. Order Third party link
MOUSER WORLDWIDE 91 1 Buy from Distributor

Distributor reported inventory date: 2021-10-16

Distributor Name

MOUSER

Stock

91

Min.Order

1

Region

WORLDWIDE Buy from Distributor

Distributor reported inventory date: 2021-10-16

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-40

(max)

125

Budgetary Price (US$)* / Qty

0.682 / 1k

Country of Origin

MALAYSIA

STWD100NXWY3F

Marketing Status

Active

ECCN (US)

EAR99

Budgetary Price (US$)*/Qty

ECCN (EU)

NEC

Packing Type

Tape And Reel

Package

SOT23-5L

Operating Temperature (°C)

(min)

-

(max)

-

Budgetary Price (US$)* / Qty

Country of Origin

CHINA

(*) 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