TPS3431SDRBR - Programmable Window Watchdog Timer | TI
料号： TPS3431SDRBR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0.5951 | $0.60 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
TPS3431SDRBR 概述
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.
直接替换替代料： TPS3431SDRBR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
TPS3431SQDRBRQ1
✅ 直接替换📋 参考替代料（不在目录中）
TPS3431SDRBR 规格参数
| 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 |
| 封装 | 8-SON (3 mm × 3 mm) |
| Package Type | VSON |
| 安装类型 | Surface mount |
| 工作温度范围 | -40 °C to +125 °C |
TPS3431SDRBR vson 引脚配置指南
TPS3431SDRBR（vson 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： TPS3431SDRBR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
TPS3431SDRBR 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： TPS3431SDRBR ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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 |
关键差异点
- Programmable window-watchdog supervision （对比 TPS3431SQDRBRQ1)
- Disable control for controlled operating states （对比 TPS3431SQDRBRQ1)
- Temperature-specified timing range （对比 TPS3431SQDRBRQ1)
设计说明
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.
合规信息
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.
