STWD100NYWY3F: ST, Watchdog Timer Circuit, STWD100NYWY3F PDF
5V 5 Terminals 5-Pin STWD100 Voltage supervisor Automotive, AEC-Q100 Series Min -300mV Max 7V









5V 5 Terminals 5-Pin STWD100 Voltage supervisor Automotive, AEC-Q100 Series Min -300mV Max 7V
The STWD100NYWY3F watchdog timer circuits are self-contained devices. This post will unlock more details about STWD100NYWY3F, including its pinout, datasheet, features and more about STWD100NYWY3F. Welcome your RFQ!

The Watchdog Timer on Arduino
- STWD100NYWY3F Pinout
- STWD100NYWY3F CAD Model
- STWD100NYWY3F Description
- STWD100NYWY3F Feature
- STWD100NYWY3F Application
- STWD100NYWY3F Block Diagram
- STWD100NYWY3F Interfacing to Microprocessors with Bidirectional Reset Pins
- How to Operate STWD100NYWY3F?
- Specifications
- Parts with Similar Specs
- STWD100NYWY3F Package
- STWD100NYWY3F Manufacturer
- Datasheet PDF
- Trend Analysis
STWD100NYWY3F Pinout

STWD100NYWY3F Pinout
Name | pin | Description |
WDO | 1 | Watchdog output |
GND | 2 | Ground |
EN | 3 | Enable pin |
WDI | 4 | Watchdog input |
Vcc | 5 | Supply voltage |
STWD100NYWY3F CAD Model
Symbol

STWD100NYWY3F Symbol
Footprint

STWD100NYWY3F Footprint
3D Model

STWD100NYWY3F 3D Model
STWD100NYWY3F Description
The STWD100NYWY3F watchdog timer circuit is a self-contained device that prevents 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 a loop). The STWD100NYWY3F 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, two. 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 STWD100NYWY3F 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.
STWD100NYWY3F Feature
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-pull WDO output
Operating temperature range: –40 to 125 °C
Packages: SOT23-5 and SC70-5 (SOT323-5)
ESD performance
-HBM: 2000 V
-CDM: 1000 V
Automotive qualified
STWD100NYWY3F Application
Telecommunications
Alarm systems
Industrial equipment
Networking
Medical equipment
UPS (uninterruptible power supply)
Automotive
STWD100NYWY3F Block Diagram
The STWD100NYWY3F block diagram is given below:

STWD100NYWY3F Block Diagram
STWD100NYWY3F Interfacing to Microprocessors with Bidirectional Reset Pins
Microprocessors with bidirectional reset pins can contend with the STWD100NYWY3F watchdog output, WDO. For example, if the WDO output is driven high and the micro wants to pull it low, signal contention is the result. To prevent this from occurring, connect a 4.7 kΩ resistor between the WDO output and the microprocessors reset I/O as in the figure below.

STWD100NYWY3F Application Circuit
How to Operate STWD100NYWY3F?
The STWD100NYWY3F device is used to detect an out-of-control MCU. The user has to ensure watchdog reset within the watchdog timeout period, otherwise, the watchdog output is asserted and the MCU is restarted. The STWD100NYWY3F can also be enabled or disabled by the chip enable pin. The following figure is the operation circuit of STWD100NYWY3F.

STWD100NYWY3F Operation Circuit
Specifications
- TypeParameter
- Lifecycle Status
Lifecycle Status refers to the current stage of an electronic component in its product life cycle, indicating whether it is active, obsolete, or transitioning between these states. An active status means the component is in production and available for purchase. An obsolete status indicates that the component is no longer being manufactured or supported, and manufacturers typically provide a limited time frame for support. Understanding the lifecycle status is crucial for design engineers to ensure continuity and reliability in their projects.
ACTIVE (Last Updated: 7 months ago) - Factory Lead Time14 Weeks
- Contact Plating
Contact plating (finish) provides corrosion protection for base metals and optimizes the mechanical and electrical properties of the contact interfaces.
Gold - Mount
In electronic components, the term "Mount" typically refers to the method or process of physically attaching or fixing a component onto a circuit board or other electronic device. This can involve soldering, adhesive bonding, or other techniques to secure the component in place. The mounting process is crucial for ensuring proper electrical connections and mechanical stability within the electronic system. Different components may have specific mounting requirements based on their size, shape, and function, and manufacturers provide guidelines for proper mounting procedures to ensure optimal performance and reliability of the electronic device.
Surface Mount - Mounting Type
The "Mounting Type" in electronic components refers to the method used to attach or connect a component to a circuit board or other substrate, such as through-hole, surface-mount, or panel mount.
Surface Mount - Package / Case
refers to the protective housing that encases an electronic component, providing mechanical support, electrical connections, and thermal management.
SC-74A, SOT-753 - Number of Pins5
- Weight29.993795mg
- Number of Elements1
- Watchdog TimersYes
- Operating Temperature
The operating temperature is the range of ambient temperature within which a power supply, or any other electrical equipment, operate in. This ranges from a minimum operating temperature, to a peak or maximum operating temperature, outside which, the power supply may fail.
-40°C~125°C TA - Packaging
Semiconductor package is a carrier / shell used to contain and cover one or more semiconductor components or integrated circuits. The material of the shell can be metal, plastic, glass or ceramic.
Cut Tape (CT) - Series
In electronic components, the "Series" refers to a group of products that share similar characteristics, designs, or functionalities, often produced by the same manufacturer. These components within a series typically have common specifications but may vary in terms of voltage, power, or packaging to meet different application needs. The series name helps identify and differentiate between various product lines within a manufacturer's catalog.
Automotive, AEC-Q100 - JESD-609 Code
The "JESD-609 Code" in electronic components refers to a standardized marking code that indicates the lead-free solder composition and finish of electronic components for compliance with environmental regulations.
e3 - Part Status
Parts can have many statuses as they progress through the configuration, analysis, review, and approval stages.
Active - Moisture Sensitivity Level (MSL)
Moisture Sensitivity Level (MSL) is a standardized rating that indicates the susceptibility of electronic components, particularly semiconductors, to moisture-induced damage during storage and the soldering process, defining the allowable exposure time to ambient conditions before they require special handling or baking to prevent failures
1 (Unlimited) - Number of Terminations5
- ECCN Code
An ECCN (Export Control Classification Number) is an alphanumeric code used by the U.S. Bureau of Industry and Security to identify and categorize electronic components and other dual-use items that may require an export license based on their technical characteristics and potential for military use.
EAR99 - TypeWatchdog Circuit
- Terminal Finish
Terminal Finish refers to the surface treatment applied to the terminals or leads of electronic components to enhance their performance and longevity. It can improve solderability, corrosion resistance, and overall reliability of the connection in electronic assemblies. Common finishes include nickel, gold, and tin, each possessing distinct properties suitable for various applications. The choice of terminal finish can significantly impact the durability and effectiveness of electronic devices.
Tin (Sn) - Power Rating
The "Power Rating" of an electronic component refers to the maximum amount of power that the component can handle or dissipate without being damaged. It is typically measured in watts and is an important specification to consider when designing or selecting components for a circuit. Exceeding the power rating of a component can lead to overheating, malfunction, or even permanent damage. It is crucial to ensure that the power rating of each component in a circuit is sufficient to handle the power levels expected during normal operation to maintain the reliability and longevity of the electronic system.
320mW - Max Power Dissipation
The maximum power that the MOSFET can dissipate continuously under the specified thermal conditions.
320mW - Terminal Position
In electronic components, the term "Terminal Position" refers to the physical location of the connection points on the component where external electrical connections can be made. These connection points, known as terminals, are typically used to attach wires, leads, or other components to the main body of the electronic component. The terminal position is important for ensuring proper connectivity and functionality of the component within a circuit. It is often specified in technical datasheets or component specifications to help designers and engineers understand how to properly integrate the component into their circuit designs.
DUAL - Terminal Form
Occurring at or forming the end of a series, succession, or the like; closing; concluding.
GULL WING - Supply Voltage
Supply voltage refers to the electrical potential difference provided to an electronic component or circuit. It is crucial for the proper operation of devices, as it powers their functions and determines performance characteristics. The supply voltage must be within specified limits to ensure reliability and prevent damage to components. Different electronic devices have specific supply voltage requirements, which can vary widely depending on their design and intended application.
5V - Base Part Number
The "Base Part Number" (BPN) in electronic components serves a similar purpose to the "Base Product Number." It refers to the primary identifier for a component that captures the essential characteristics shared by a group of similar components. The BPN provides a fundamental way to reference a family or series of components without specifying all the variations and specific details.
STWD100 - Output
In electronic components, the parameter "Output" typically refers to the signal or data that is produced by the component and sent to another part of the circuit or system. The output can be in the form of voltage, current, frequency, or any other measurable quantity depending on the specific component. The output of a component is often crucial in determining its functionality and how it interacts with other components in the circuit. Understanding the output characteristics of electronic components is essential for designing and troubleshooting electronic circuits effectively.
Open Drain or Open Collector - Pin Count
a count of all of the component leads (or pins)
5 - Operating Supply Voltage
The voltage level by which an electrical system is designated and to which certain operating characteristics of the system are related.
5V - Max Supply Voltage
In general, the absolute maximum common-mode voltage is VEE-0.3V and VCC+0.3V, but for products without a protection element at the VCC side, voltages up to the absolute maximum rated supply voltage (i.e. VEE+36V) can be supplied, regardless of supply voltage.
7V - Min Supply Voltage
The minimum supply voltage (V min ) is explored for sequential logic circuits by statistically simulating the impact of within-die process variations and gate-dielectric soft breakdown on data retention and hold time.
-300mV - Nominal Supply Current
Nominal current is the same as the rated current. It is the current drawn by the motor while delivering rated mechanical output at its shaft.
13μA - Power Dissipation
the process by which an electronic or electrical device produces heat (energy loss or waste) as an undesirable derivative of its primary action.
320mW - Output Current
The rated output current is the maximum load current that a power supply can provide at a specified ambient temperature. A power supply can never provide more current that it's rated output current unless there is a fault, such as short circuit at the load.
20μA - Reset
The "Reset" parameter in electronic components refers to a function that initializes or sets a device to a predefined state. It is often used to clear any temporary data, errors, or configurations that may have been stored during operation. The reset process can ensure that the device starts from a known good state, allowing for reliable performance in subsequent tasks. This parameter is critical in digital circuits and systems where proper initialization is necessary for correct functioning.
Active Low - Reset Timeout
The "Reset Timeout" parameter in electronic components refers to the amount of time it takes for a device to reset or return to its default state after a specific event or condition. This parameter is crucial in ensuring the proper functioning and reliability of the component, as it determines how quickly the device can recover from a fault or error situation. A shorter reset timeout typically indicates a faster response time, while a longer reset timeout may allow for more thorough error recovery processes. Designers and engineers must carefully consider the reset timeout value to meet the requirements of the application and ensure optimal performance of the electronic component.
1.12s Minimum - Ambient Temperature Range High
This varies from person to person, but it is somewhere between 68 and 77 degrees F on average. The temperature setting that is comfortable for an individual may fluctuate with humidity and outside temperature as well. The temperature of an air conditioned room can also be considered ambient temperature.
125°C - Height1.45mm
- Length2.9mm
- Width1.6mm
- Radiation Hardening
Radiation hardening is the process of making electronic components and circuits resistant to damage or malfunction caused by high levels of ionizing radiation, especially for environments in outer space (especially beyond the low Earth orbit), around nuclear reactors and particle accelerators, or during nuclear accidents or nuclear warfare.
No - RoHS Status
RoHS means “Restriction of Certain Hazardous Substances” in the “Hazardous Substances Directive” in electrical and electronic equipment.
ROHS3 Compliant - Lead Free
Lead Free is a term used to describe electronic components that do not contain lead as part of their composition. Lead is a toxic material that can have harmful effects on human health and the environment, so the electronics industry has been moving towards lead-free components to reduce these risks. Lead-free components are typically made using alternative materials such as silver, copper, and tin. Manufacturers must comply with regulations such as the Restriction of Hazardous Substances (RoHS) directive to ensure that their products are lead-free and environmentally friendly.
Lead Free
Parts with Similar Specs
- ImagePart NumberManufacturerPackage / CaseNumber of PinsResetReset TimeoutWatchdog TimerMin Supply VoltageSupply VoltageMax Supply VoltageView Compare
STWD100NYWY3F
SC-74A, SOT-753
5
Active Low
1.12s Minimum
Yes
-300 mV
5 V
7 V
SOT-23-5 Thin, TSOT-23-5
5
Active Low
140ms Minimum
Yes
1.2 V
3 V
5.5 V
SC-74A, SOT-753
5
Active Low
140ms Minimum
Yes
1 V
-
5.5 V
SC-74A, SOT-753
5
Active Low
140ms Minimum
Yes
1 V
3 V
5.5 V
SC-74A, SOT-753
5
Active Low
1.12s Minimum
Yes
1 V
-
5.5 V
STWD100NYWY3F Package

STWD100NYWY3F Package
STWD100NYWY3F Manufacturer
STMicroelectronics is a global independent semiconductor company and is a leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications. An unrivalled combination of silicon and system expertise, manufacturing strength, Intellectual Property (IP) portfolio and strategic partners positions the Company at the forefront of System-on-Chip (SoC) technology and its products play a key role in enabling today's convergence trends.
Datasheet PDF
- Datasheets :
Trend Analysis
What is watchdog timer example?
Watchdog timers are also used to monitor and limit software execution time on a normally functioning computer. For example, a watchdog timer may be used when running untrusted code in a sandbox, to limit the CPU time available to the code and thus prevent some types of denial-of-service attacks.
What is the difference between timer and watchdog timer?
A watchdog timer is a specialized timer module that helps a microprocessor recover from malfunctions. If a watchdog timer reaches the end of its counting period, it resets the entire processor system. In order to prevent this, a processor must perform some type of specific action that resets the watchdog.
What is watchdog timer interrupt?
A Watchdog timer is a software timer used to detect and recover from deadlock conditions. When a Watchdog timer triggers it interrupts the controller processor by initiating a controller reset.
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