TPS3431SDRBR - Programmable Window Watchdog Timer | TI
MPN: TPS3431SDRBR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $0.5951 | $0.60 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
TPS3431SDRBR Overview
A watchdog timer is a supervisory power-management IC that requires an external refresh signal within a defined interval. If the refresh is missing or occurs outside the programmed window, the device asserts its reset output. The TPS3431 belongs to the watchdog-timer and system-reset hierarchy, helping protect embedded systems against firmware hangs, processor faults, and communication failures.
The watchdog timeout can be programmed with an external capacitor or factory-programmed default delay settings. According to the verified product information, the timing accuracy is 15% across the -40 °C to +125 °C temperature range and typically 2.5% at 25 °C. The watchdog can also be disabled through the Enable pin or SET logic pins, which is useful during development, production testing, and controlled shutdown sequences.
The TPS3431 is suitable for industrial controllers, embedded processors, automotive electronics, communications equipment, and consumer systems that require deterministic supervision. Its small package supports compact PCB layouts, while the programmable timing and enable functions provide design flexibility across different system architectures. The device is identified by distributors as an 8-SON, 3 x 3 mm watchdog circuit IC.
Designers should verify the exact package dimensions, exposed-pad requirements, pin functions, timeout configuration, reset polarity, and capacitance value against the manufacturer datasheet before layout or production release. Because the provided web data does not include the complete electrical timing table or detailed pin mapping, those values are marked as needed rather than inferred.
This page consolidates the verified manufacturer and distributor information, practical application guidance, datasheet links, and qualification questions for engineers evaluating TPS3431SDRBR. It is intended to support component selection and design review while preserving the distinction between verified specifications and information requiring confirmation from the full manufacturer datasheet.
Drop-in alternatives for TPS3431SDRBR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS3431SQDRBRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
TPS3431SDRBR Specifications
| Product Type | Programmable window watchdog timer |
| Manufacturer | Texas Instruments |
| Enable Feature | Yes |
| Watchdog Timeout Accuracy, Typical at 25 °C | 2.5% |
| Watchdog Timeout Accuracy Over Temperature | 15% from -40 °C to +125 °C |
| Timeout Configuration | External capacitor or factory-programmed default delay settings |
| Watchdog Disable Control | Enable pin or SET logic pins |
| Package | 8-SON (3 mm × 3 mm) |
| Package Type | VSON |
| Mounting Type | Surface mount |
| Operating Temperature Range | -40 °C to +125 °C |
TPS3431SDRBR vson Pin Configuration Guide
Pin configuration for TPS3431SDRBR (vson package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for TPS3431SDRBR.
Refer to the datasheet for full pin configuration.
Typical Applications
TPS3431SDRBR is suitable for 6 applications: Embedded Processor Supervision, Industrial Controller Monitoring, Automotive Electronics, Communications Equipment, Consumer Device Main Control, Test and Measurement Equipment.
Embedded Processor Supervision
TPS3431SDRBR fits embedded processor systems that must periodically refresh a watchdog signal to prove firmware execution is progressing. Its programmable window-watchdog behavior can detect both a late refresh and an unexpectedly early refresh, helping distinguish a healthy operating sequence from a stalled or malfunctioning firmware path. The 8-SON, 3 mm × 3 mm package supports compact controller layouts, while the Enable pin permits controlled watchdog disablement during development. Before implementation, verify the processor refresh waveform, reset polarity, supply voltage, and timing limits in the manufacturer datasheet.
Recommended
Industrial Controller Monitoring
Use TPS3431SDRBR in industrial controllers where a missed heartbeat can cause unsafe or unpredictable actuator behavior. Its verified -40 °C to +125 °C timing specification range supports design consideration across industrial temperature environments, while the programmable timeout supports different control-loop refresh expectations. The watchdog can be disabled through Enable or SET logic during controlled maintenance, but production firmware should validate watchdog state during startup. Confirm the full electrical limits and reset behavior before applying it to machinery or process-control equipment.
Recommended
Automotive Electronics
TPS3431SDRBR can be evaluated for automotive electronic modules because its verified timing accuracy is specified from -40 °C to +125 °C and it provides a compact 8-SON package. Automotive suitability depends on the exact qualification status, system voltage, transient requirements, and diagnostic behavior, none of which are fully stated in the supplied snippets. TPS3431SQDRBRQ1 is identified in the cross-reference data as an automotive-rated, highly similar family variant, but it should be selected only after checking its manufacturer qualification and pin configuration.
Recommended
Communications Equipment
TPS3431SDRBR is applicable to communications modules where a processor or baseband controller must maintain a regular service heartbeat. A missed refresh can indicate a firmware deadlock, communication-task failure, or abnormal processor state, allowing the system supervisor to initiate a defined recovery response. Its window timing can be configured around the system’s refresh policy, and the Enable function can support development and controlled shutdown modes. Verify logic levels, maximum timing error, reset assertion, and watchdog output routing before deployment.
Recommended
Consumer Device Main Control
TPS3431SDRBR can supervise a consumer-device main controller when reliable recovery from firmware or application faults is important. The small 3 mm × 3 mm package helps preserve board area, and the programmable timing allows the watchdog policy to be matched to the expected operating mode. The Enable pin can avoid nuisance resets during manufacturing, boot-loader activity, or intentional shutdown. Designers should confirm whether the device’s reset output suits the system power architecture and should validate the external timing capacitor and startup sequence against the complete datasheet.
Recommended
Test and Measurement Equipment
TPS3431SDRBR is suitable for test and measurement controllers that need to detect a stalled acquisition or control process. A watchdog refresh can be generated only when the instrument completes expected housekeeping or measurement tasks, allowing the supervisor to detect an abnormal software state. The programmable window function is useful when the instrument has multiple operating modes with different valid refresh intervals. Verify the reset behavior, timing tolerance, supply range, and package land pattern before integrating it into a precision instrument.
Recommended
Recommended Products Summary
Engineering reference data for TPS3431SDRBR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS3431SQDRBRQ1 |
|---|---|---|
| Product Type | Programmable window watchdog timer | Automotive-rated watchdog variant; exact product type not specified in verified data |
| Brand | Texas Instruments | Texas Instruments |
| Automotive Qualification | Not explicitly stated in verified data | Identified as automotive-rated in cross-reference data |
Key Differentiators
- Programmable window-watchdog supervision (vs TPS3431SQDRBRQ1)
- Disable control for controlled operating states (vs TPS3431SQDRBRQ1)
- Temperature-specified timing range (vs TPS3431SQDRBRQ1)
Design Notes
Confirm the device supply-voltage range, absolute maximum ratings, power consumption, and decoupling requirements from the official Texas Instruments datasheet before layout. The supplied search data confirms a 3.00 mm × 3.00 mm, 8-SON package but does not provide the complete electrical limits. Place the required input capacitor close to the supply and ground pins, and verify the exposed-pad connection against the package drawing.
Route the watchdog input, Enable input, SET logic, and reset or fault output with short, controlled traces. Keep timing-capacitor routing close to the device and away from fast switching nodes or high-current return paths. Because the verified information does not include the complete pin table, confirm pin numbering and exposed-pad requirements directly from the manufacturer package drawing before releasing the PCB.
Do not treat the external-capacitor timeout as an unlimited or user-selectable value without checking the permitted capacitance range and timing equation. Also verify reset polarity, timeout polarity, and whether early refreshes are treated as faults. The TPS3431’s window-watchdog behavior differs from a simple maximum-time watchdog, so firmware timing should be validated against both the minimum and maximum allowable refresh interval.
Keep the watchdog refresh signal clean and free from long unterminated traces, because false edges or ringing can change the apparent refresh interval. Match the processor output voltage to the watchdog input requirements and provide appropriate grounding. Review the manufacturer’s timing characteristics across temperature; the verified data specifies 2.5% typical accuracy at 25 °C and 15% from -40 °C to +125 °C.
Compliance Information
The supplied verified data does not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status for TPS3431SDRBR. AEC-Q100 status is also not explicitly stated for this exact MPN; the cross-reference data only identifies TPS3431SQDRBRQ1 as automotive-rated.
