Texas Instruments TPS3851G50EQDRBRQ1

Overview

TPS3851G50EQDRBRQ1 from Texas Instruments is a high-accuracy AEC-Q100 Grade 1 voltage supervisor with integrated watchdog timer, featuring 0.8% undervoltage threshold accuracy (–40°C to +125°C), 200 ms reset timeout (±15%), and factory-programmed 1.6 s watchdog timeout. It monitors 4.8 V rails in automotive ADAS domain controllers and supports open-drain RESET/WDO outputs with manual reset (MR) and watchdog disable (SET1) inputs.

For engineers reviewing the TPS3851G50EQDRBRQ1 datasheet, TPS3851G50EQDRBRQ1 pinout, TPS3851G50EQDRBRQ1 application, or TPS3851G50EQDRBRQ1 equivalent, this page delivers verified functional safety-capable specifications, validated 8-pin VSON package details, confirmed automotive-grade thermal performance (RθJA = 47.7°C/W), and precise timing behavior for system-level reset coordination and fault detection in safety-critical vehicle electronics.

Technical Context

The TPS3851G50EQDRBRQ1 implements a precision bandgap reference and comparator architecture achieving ±0.8% VITN accuracy across –40°C to +125°C ambient, with 0.5% hysteresis to prevent chatter on noisy 4.8 V supply rails. Its dual-timing watchdog uses either factory-programmed delays (1.6 s typical) or user-configurable capacitor-based timing, with independent WDO output enabling fault isolation without full system reset.

Functional modes are controlled by SET1 (watchdog enable/disable), MR (asynchronous reset assertion), and CWD (timing selection). The device operates from 1.6 V to 6.5 V, draws only 10 µA typical supply current, and features wettable flanks on its 3 mm × 3 mm VSON package for automated optical inspection in automotive PCB assembly.

Key Specifications

Pinout & Package

TPS3851G50EQDRBRQ1 is housed in a 3.00 mm × 3.00 mm, 8-pin VSON (DRB) package with wettable flanks for solder joint 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 TPS3851G50EQDRBRQ1, the QDRBRQ1 variant offers identical performance in standard packaging, while MAX6375TATA+T provides lower-accuracy supervision without automotive qualification or functional safety support-making it unsuitable for ADAS or domain controller deployment.

Availability

TPS3851G50EQDRBRQ1 is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, surround-view ECUs, and front-camera power management requiring stable component supply, AEC-Q100 compliance, and functional safety documentation.

Supply support for TPS3851G50EQDRBRQ1 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 company specializing in analog and embedded processing technologies, with leadership in automotive, industrial, and power management solutions.

The TPS3851-Q1 product line delivers high-accuracy, AEC-Q100-qualified supervisors with integrated watchdog timers specifically designed for safety-critical automotive electronics including ADAS, body control, and powertrain systems.

FAQ

What is the exact undervoltage threshold voltage for TPS3851G50EQDRBRQ1?

The TPS3851G50EQDRBRQ1 has a nominal undervoltage threshold (VITN) of 4.8 V, with ±0.8% accuracy over –40°C to +125°C ambient temperature. This value is factory-trimmed and confirmed in TI's SBVS286B datasheet Section 5.5, enabling precise supervision of 5 V rails in automotive applications where tight tolerance is critical for microcontroller stability.

Does TPS3851G50EQDRBRQ1 support both standard and extended watchdog timing modes?

Yes, TPS3851G50EQDRBRQ1 supports both standard and extended watchdog timing. Standard timing yields 1.6 s typical timeout (1360–1840 ms), while extended timing provides longer intervals. Selection is determined by part suffix (S-Q1 vs E-Q1), but TPS3851G50EQDRBRQ1 is the standard-timing variant. The CWD pin configuration and SET1 state determine active timing mode per Table 7-1 in the datasheet.

How does the watchdog disable function work on TPS3851G50EQDRBRQ1?

The watchdog disable function on TPS3851G50EQDRBRQ1 is controlled by the SET1 pin: grounding SET1 disables the watchdog timer entirely, causing WDI pulses to be ignored and WDO to remain high-impedance. This feature allows safe firmware development without unintended resets. When disabled, WDI must be driven to VDD or GND to avoid increased supply current, as specified in Section 6.3.4.4.

What package type and dimensions does TPS3851G50EQDRBRQ1 use?

TPS3851G50EQDRBRQ1 uses a 3.00 mm × 3.00 mm, 8-pin VSON (DRB) package with wettable flanks. The thermal pad is internally connected to GND and must be soldered to a large-area ground plane. This compact, automotive-qualified package supports automated optical inspection and meets IPC-7351B standards for surface-mount assembly in high-reliability vehicle electronics.

Is TPS3851G50EQDRBRQ1 qualified for functional safety applications?

Yes, TPS3851G50EQDRBRQ1 is functional safety-capable with documentation available to aid ISO 26262 system design. It meets AEC-Q100 Grade 1 requirements (–40°C to +125°C), includes FIT rate data, failure mode analysis, and safety manuals from Texas Instruments. These resources support ASIL-B integration in automotive ADAS and domain controller applications where supervised reset integrity is mandatory.