Texas Instruments TPS3851G30SQDRBRQ1

Overview

TPS3851G30SQDRBRQ1 from Texas Instruments is a high-accuracy AEC-Q100 Grade 1 automotive voltage supervisor with integrated programmable watchdog timer, 0.8% VITN threshold accuracy over –40°C to +125°C, 200 ms reset timeout (±15%), and 1.6V–6.5V supply range. It monitors 3.0V rails in ADAS domain controllers and provides independent WDO for fault diagnostics without full system reset.

For engineers reviewing the TPS3851G30SQDRBRQ1 datasheet, TPS3851G30SQDRBRQ1 pinout, TPS3851G30SQDRBRQ1 application, or TPS3851G30SQDRBRQ1 equivalent, this page delivers verified functional safety-capable specifications, factory-programmed watchdog timing options, open-drain RESET/WDO outputs, and VSON-8 wettable flank package details required for automotive power-rail supervision and watchdog validation.

Technical Context

The TPS3851G30SQDRBRQ1 implements a precision bandgap-based undervoltage comparator with 0.5% hysteresis and 0.8% total threshold accuracy across temperature, enabling reliable detection of 3.0V rail collapse before microcontroller brownout. Its dual-output architecture separates RESET assertion (system-level reset) from WDO assertion (diagnostic flag), allowing fault isolation without interrupting host operation.

Watchdog timing is determined by CWD pin configuration: unconnected or 10kΩ pullup enables factory-programmed 1.6 s (standard) or 200 ms (extended) timeouts; capacitor connection enables user-adjustable timing via 375 nA constant-current charge. SET1 pin disables watchdog independently of MR or VDD state.

Key Specifications

Pinout & Package

TPS3851G30SQDRBRQ1 uses a 3.00 mm × 3.00 mm, 8-pin VSON package with wettable flanks for automated optical inspection. Thermal pad is internally connected to GND and must be soldered to a large-area ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor with watchdog applications.

Compared with TPS3851G18SQDRBRQ1 and TPS3851G50SQDRBRQ1, the TPS3851G30SQDRBRQ1 delivers matched 3.0V threshold accuracy, eliminating calibration overhead and ensuring correct reset behavior at nominal 3.0V rail voltage without margin adjustment.

Availability

TPS3851G30SQDRBRQ1 is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, surround-view ECUs, front camera modules, and occupant detection sensors requiring stable component supply with AEC-Q100 compliance and functional safety documentation.

Supply support for TPS3851G30SQDRBRQ1 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

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and automotive-grade ICs, with decades of automotive qualification expertise and broad functional safety infrastructure.

The TPS3851-Q1 product line delivers high-accuracy, AEC-Q100 qualified supervisors with integrated watchdog timers specifically engineered for safety-critical automotive power-rail monitoring in ADAS, infotainment, and body electronics.

FAQ

What is the undervoltage threshold voltage for TPS3851G30SQDRBRQ1?

The TPS3851G30SQDRBRQ1 has a fixed 3.0V undervoltage threshold (VITN) with ±0.8% accuracy over –40°C to +125°C. This means the actual trip point falls between 2.976V and 3.024V across the full automotive temperature range, ensuring precise supervision of nominal 3.0V rails without external trimming.

Does TPS3851G30SQDRBRQ1 support both standard and extended watchdog timing modes?

Yes, the TPS3851G30SQDRBRQ1 supports two factory-programmed watchdog timeout options: 1.6 seconds for standard timing and 200 milliseconds for extended timing. Selection is controlled by CWD pin configuration (unconnected vs. 10kΩ pullup) and SET1 logic level, enabling flexible fault-detection windows without external components.

How does the watchdog disable feature work on TPS3851G30SQDRBRQ1?

The TPS3851G30SQDRBRQ1 watchdog is disabled by grounding the SET1 pin. When SET1 = low, the watchdog timer is inactive and WDI input is ignored. WDI must still be driven to VDD or GND to prevent increased supply current. This hardware disable enables safe firmware development and bootloader operation without software intervention.

What package type and dimensions does TPS3851G30SQDRBRQ1 use?

The TPS3851G30SQDRBRQ1 uses a 3.00 mm × 3.00 mm, 8-pin VSON package (DRB) with wettable flanks. The thermal pad is internally connected to GND and must be soldered to a large-area ground plane for thermal performance and manufacturability. This compact, automotive-qualified package supports AOI and high-density PCB layouts.

Is TPS3851G30SQDRBRQ1 qualified for automotive applications?

Yes, the TPS3851G30SQDRBRQ1 is AEC-Q100 qualified for Grade 1 (–40°C to +125°C ambient), with HBM ±4 kV and CDM ±1 kV ESD ratings. It also provides functional safety documentation including FIT rate and failure mode analysis, supporting ISO 26262 ASIL-B system integration in ADAS and safety-critical vehicle subsystems.