TPS3431SQDRBRQ1

Overview

The TPS3431SQDRBRQ1 is an automotive-grade, low-power watchdog timer and voltage supervisor manufactured by Texas Instruments. It operates within a supply voltage range of 1.65 V to 5.5 V and features a programmable timeout period ranging from 70 ms to 20 seconds via an external capacitor. The device includes a manual reset input, an open-drain reset output, and a fault flag output. Certified under AEC-Q100 standards, it supports junction temperatures from -40°C to +125°C and is housed in an 8-pin VSON package.

Feature Summary

• Integrated watchdog timer with programmable timeout (70 ms to 20 s) controlled by an external capacitor
• Voltage supervisor with selectable threshold voltages and 1% accuracy
• Manual reset input for system initialization or recovery
• Open-drain RESET output and FAULT flag output for status indication

Applications

• Automotive electronic control units (ECUs)
• Infotainment systems requiring reliable software monitoring
• Body control modules (BCMs)
• Industrial controllers operating in harsh environments

Procurement Notes

Verify the specific suffix 'SQ' against the manufacturer's official datasheet to confirm the exact threshold voltage and package variant. Ensure that the ordering information matches the required AEC-Q100 qualification level for automotive deployment. Cross-reference the pinout with the 8-VSON(3x3) footprint specifications during PCB layout.

Selection Notes

Select this component when a combined voltage supervision and software watchdog function is required in a single package. The external capacitor allows flexibility in setting the timeout duration to match specific application latency requirements. Verify that the supply voltage range covers the system's operational rails and that the open-drain output compatibility matches the downstream logic levels.

Part Context

This part belongs to the TPS3431-Q1 family of supervisory circuits designed for automotive applications. It shares functional similarities with other devices in the series but differs in specific electrical parameters such as threshold voltage and package type. The 'Q1' designation indicates compliance with automotive reliability standards.

Replacement Considerations

The TPS3431G25EQDRBRQ1 is listed as a parameter-equivalent alternative. Verify that the threshold voltage and package dimensions are compatible with the existing design before substitution.