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STMicroelectronics STWD100PYW83F
- Part No.:
- STWD100PYW83F
- Manufacturer:
- STMicroelectronics
- Category:
- Supervisors
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
STWD100PYW83F.pdf
- Description:
- IC SUPERVISOR 1 CHANNEL SOT323-5
- Quantity:
- Payment:
- Shipping:
Inventory:18,516
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Product details
Overview
STWD100PYW83F from STMicroelectronics is a single-supply, automotive-qualified watchdog timer IC with 3.4 ms / 6.3 ms / 102 ms / 1.6 s selectable timeout periods, 13 µA typical supply current, and –40 to 125 °C operating range. It features WDI input, active-low WDO output (open-drain or push-pull), chip-enable pin (EN), and is used in safety-critical embedded systems to recover from MCU lockups caused by software hangs or hardware faults.
For engineers reviewing the STWD100PYW83F datasheet, STWD100PYW83F pinout, STWD100PYW83F application, or STWD100PYW83F equivalent, key selection criteria include timeout period granularity, EN pin behavior under transient conditions, WDO output configuration flexibility, and qualification for automotive-grade thermal and ESD stress (HBM 2000 V, CDM 1000 V).
Technical Context
The STWD100PYW83F implements a self-contained watchdog timer with independent reset timing logic that starts counting upon VCC exceeding VSTART (1.9–2.7 V). Timeout detection is triggered only when WDI is not toggled within tWD - no internal clock source or external crystal required.
Its EN pin provides asynchronous enable/disable control with 1 µs minimum pulse width detection and internal 32–100 kΩ pull-down; WDO assertion duration is fixed at ≥10 µs for STWD100xP variants (including PYW83F), and its open-drain mode supports level-shifting up to 6 V via external pull-up.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Watchdog timeout periods | 3.4 ms, 6.3 ms, 102 ms, 1.6 s - four factory-set options; no external components needed for timing selection |
| Supply current (ICC) | 13 µA typ. - enables ultra-low-power operation in battery-backed or energy-constrained systems |
| Operating temperature | –40 to 125 °C - qualified for under-hood automotive and industrial environments |
| VCC range | 2.7 V to 5.5 V - compatible with 3.3 V and 5 V logic domains without level translation |
| WDO output type | Configurable open-drain or push-pull - allows direct interface to bidirectional reset pins or external pull-up to higher voltage rails |
| ESD rating | HBM: 2000 V, CDM: 1000 V - meets robustness requirements for assembly and field operation in harsh environments |
| EN pin behavior | Internal 32–100 kΩ pull-down; enables device when floating - eliminates need for external biasing in most designs |
Pinout & Package
STWD100PYW83F is packaged in SC70-5 (SOT323-5), a 1.8 × 2.2 mm surface-mount package with 0.65 mm lead pitch, optimized for space-constrained automotive and industrial PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (WDO) | Watchdog output | Active-low signal asserted on timeout; configurable as open-drain (requires external pull-up) or push-pull |
| 2 (GND) | Ground reference | Primary return path for VCC and all I/O; must be low-impedance connection to system ground plane |
| 3 (EN) | Chip enable input | Asynchronous enable/disable control; internal pull-down ensures default-enabled state when left floating |
| 4 (WDI) | Watchdog input | Edge-sensitive reset trigger; accepts ≥1 µs pulses; ignores <100 ns glitches |
| 5 (VCC) | Power supply | Single 2.7–5.5 V supply; powers internal timer and output driver; startup occurs above VSTART (1.9–2.7 V) |
Key Features
| Feature | Design Value |
|---|---|
| Four factory-programmed timeout options | Eliminates external RC timing components and associated calibration drift or tolerance stack-up |
| EN pin with internal pull-down | Reduces BOM count and layout complexity; avoids unintended disable during power sequencing |
| WDO output configurability | Supports both legacy open-drain reset buses and modern push-pull interfaces without redesign |
| Automotive qualification (AEC-Q100) | Validated for use in engine control units, ADAS modules, and other safety-relevant vehicle subsystems |
| Low ICC (13 µA typ.) | Extends battery life in always-on monitoring circuits and enables use in energy-harvesting applications |
Applications
| Engine Control Unit (ECU) | Industrial PLC Controller |
|---|---|
Use Scenario: Monitors main MCU during cold cranking and high-temperature operation where voltage dips and thermal stress increase risk of firmware hang. IC Role / Device Role / Timing Role: Standalone watchdog timer asserting hardware reset to reboot MCU if WDI is not toggled within 102 ms timeout window. Use Value: Prevents undetected MCU freeze leading to loss of throttle control or emission compliance failure. | Use Scenario: Supervises programmable logic controller CPU during extended runtime in factory automation environments with electromagnetic interference. IC Role / Device Role / Timing Role: Independent fault detector using 3.4 ms timeout to catch rapid software stalls before process interruption occurs. Use Value: Enables deterministic recovery without operator intervention, maintaining production line uptime. |
| Medical Infusion Pump | Telecom Base Station Power Management |
Use Scenario: Ensures fail-safe shutdown of motor drivers and valve actuators if microcontroller fails during drug delivery sequence. IC Role / Device Role / Timing Role: Safety-critical watchdog with 1.6 s timeout aligned to maximum allowable delivery interval. Use Value: Meets IEC 62304 Class C software safety requirements by guaranteeing hardware-level recovery path. | Use Scenario: Guards power sequencer logic controlling FPGA, RF transceivers, and cooling fans in outdoor 4G/5G base stations. IC Role / Device Role / Timing Role: System-level watchdog using EN pin to coordinate with power-good signals and disable monitoring during safe shutdown. Use Value: Avoids spurious resets during brown-out recovery while ensuring restart after sustained power loss. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar watchdog timer applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX6375US29D3+ | Fixed 2.93 s timeout; no EN pin; 1.2 µA ICC; operates down to 1.0 V | Lacks enable control and multi-period flexibility; suited for ultra-low-power, single-timeout systems only | Select when lowest possible quiescent current and wide VCC range (1.0–5.5 V) outweigh need for timeout selection or EN functionality |
| TPS3823-33DBVR | Fixed 200 ms timeout; integrated voltage supervisor; no WDI input; push-pull only | Combines reset supervisor + watchdog but lacks retriggerable WDI interface - cannot detect software hangs mid-execution | Choose when primary need is power-fail detection with basic timeout, not continuous software health monitoring |
Compared with MAX6375US29D3+ and TPS3823-33DBVR, STWD100PYW83F uniquely delivers selectable timeouts, retriggerable WDI, and an EN pin - enabling precise fault detection granularity, flexible integration into existing reset architectures, and coordinated enable/disable during system sleep modes.
Availability
STWD100PYW83F is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLC controllers, medical infusion pumps, and telecom base station power management requiring stable component supply across extended temperature and lifecycle demands.
Supply support for STWD100PYW83F includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.
The STWD100 product line delivers compact, low-power, AEC-Q100-qualified watchdog timers targeting functional safety in automotive and mission-critical industrial control systems where deterministic recovery from MCU lockup is mandatory.
FAQ
What is the exact watchdog timeout period for STWD100PYW83F?
The STWD100PYW83F is the "xP" variant, which has a nominal watchdog timeout period of 3.4 ms (min 2.3 ms, max 4.6 ms). This value is factory-programmed and non-adjustable; no external components or configuration registers modify it.
Can STWD100PYW83F drive a microcontroller's bidirectional reset pin directly?
No - direct connection risks signal contention. The recommended interface uses a 4.7 kΩ series resistor between WDO and the MCU's bidirectional reset I/O, as specified in Figure 5 of the datasheet, to prevent simultaneous high/low drive conflicts during reset assertion or release.
Does STWD100PYW83F require an external pull-up resistor on WDO?
Yes, when configured in open-drain mode (default state unless modified per application note). A 10 kΩ pull-up to any supply ≤6 V is sufficient; the resistor ensures valid logic-high levels when WDO is inactive and limits sink current during assertion.
Is STWD100PYW83F pin-compatible with other STWD100 variants?
Yes - all STWD100 variants (xP, xW, xX, xY) share identical SC70-5/SOT23-5 pinouts and electrical interface definitions. Only timeout period and WDO pulse width differ; no PCB redesign is needed when substituting between variants for timing optimization.
STWD100PYW83F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- Watchdog Circuit
- Number of Voltages Monitored:
- 1
- Voltage - Threshold:
- -
- Output:
- Push-Pull, Totem Pole
- Reset:
- Active Low
- Reset Timeout:
- 1.12s Minimum
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-323-5
STWD100PYW83F FAQ
1.How can I place an order for STWD100PYW83F through Aetrix?
Please submit a Request for Quotation (RFQ) for STWD100PYW83F on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for STWD100PYW83F reliable?
The price and inventory of STWD100PYW83F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STWD100PYW83F is usually 5 days.
3.What payment methods are accepted for STWD100PYW83F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STWD100PYW83F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STWD100PYW83F?
STWD100PYW83F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STWD100PYW83F order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for STWD100PYW83F?
For technical support, including STWD100PYW83F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STWD100PYW83F requirements.
6.How does Aetrix verify that STWD100PYW83F is sourced from the original manufacturer or authorized distributors?
All STWD100PYW83F products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STWD100PYW83F meets industry standards.
7.What is the process for return or replacement of STWD100PYW83F?
All STWD100PYW83F units undergo pre-shipment inspection (PSI). If there is an issue with STWD100PYW83F, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The STWD100PYW83F part is unused and in its original packaging.
Return procedure for STWD100PYW83F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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