Texas Instruments TPS3851G25EQDRBRQ1

Overview

TPS3851G25EQDRBRQ1 from Texas Instruments is a high-accuracy AEC-Q100 Grade 1 automotive voltage supervisor with integrated programmable watchdog timer, 0.8% undervoltage threshold accuracy (–40°C to +125°C), 200 ms reset timeout (±15%), and open-drain RESET/WDO outputs. It monitors 2.5 V supply rails in ADAS domain controllers and front camera modules.

For engineers reviewing the TPS3851G25EQDRBRQ1 datasheet, TPS3851G25EQDRBRQ1 pinout, TPS3851G25EQDRBRQ1 application, or TPS3851G25EQDRBRQ1 equivalent, this device delivers precision undervoltage detection with 0.5% hysteresis, factory-programmed watchdog timing (1600 ms typical), manual reset input, and watchdog disable via SET1 - all in a wettable-flank 3 mm × 3 mm VSON package.

Technical Context

The TPS3851G25EQDRBRQ1 implements a precision bandgap-based comparator for VDD monitoring with 0.8% VITN accuracy over –40°C to +125°C ambient, and built-in 0.5% hysteresis to prevent chatter during rail recovery. Its state-machine-controlled watchdog supports dual timing modes: factory-programmed (1600 ms typ) or capacitor-adjustable (via CWD pin current source of 375 nA).

RESET assertion occurs when VDD falls below 2.5 V ± 0.8%, with tRST = 200 ms ± 15%; WDO asserts independently on watchdog timeout only when RESET is deasserted. The device uses open-drain outputs with 0.4 V VOL at 3 mA sink, and supports logic-level MR, SET1, and WDI inputs with defined VIH/VIL thresholds referenced to VDD.

Key Specifications

Pinout & Package

TPS3851G25EQDRBRQ1 is housed in a 3.00 mm × 3.00 mm, 8-pin VSON (DRB) 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 TPS3851G25EQDRBRQ1, TPS3851G25QDRBRQ1 offers identical supervision performance with standard-timing watchdog, while MAX6375XR25+T sacrifices watchdog flexibility and accuracy for cost-sensitive, non-safety-critical applications lacking fault isolation needs.

Availability

TPS3851G25EQDRBRQ1 is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, surround-view ECUs, and front camera modules requiring stable component supply with AEC-Q100 compliance and functional safety documentation support.

Supply support for TPS3851G25EQDRBRQ1 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 ICs, with decades of automotive qualification expertise and functional safety infrastructure.

The TPS3851-Q1 product line delivers AEC-Q100 Grade 1 voltage supervisors with integrated watchdog timers specifically engineered for ASIL-B–capable ADAS and infotainment systems demanding high accuracy, low power, and robust fault detection.

FAQ

What is the exact undervoltage threshold voltage for TPS3851G25EQDRBRQ1?

The TPS3851G25EQDRBRQ1 has a factory-set undervoltage threshold (VITN) of 2.5 V with ±0.8% accuracy across –40°C to +125°C. This value is laser-trimmed during production and confirmed in TI's SBVS286B datasheet Section 5.5. The 2.5 V designation in the part number directly specifies this threshold; no external resistor network is required to set it.

Does TPS3851G25EQDRBRQ1 support both standard and extended watchdog timing modes?

Yes, TPS3851G25EQDRBRQ1 supports both modes. The 'E' in the part number indicates extended timing capability. When CWD is unconnected and SET1 = 1, it delivers 1600 ms typical watchdog timeout (standard mode). With CWD pulled up via 10 kΩ and SET1 = 1, it provides 200 ms typical timeout (extended mode), as specified in Table 7-1 of the datasheet.

How does the manual reset (MR) pin behave on TPS3851G25EQDRBRQ1?

The MR pin on TPS3851G25EQDRBRQ1 is an active-low, internally pulled-up input. A logic-low pulse ≥1 µs forces immediate RESET assertion. After MR returns high and VDD exceeds VITN + VHYST, RESET remains low for the full tRST period (200 ms ±15%) before releasing. If unused, MR may be left floating due to its internal pullup.

What is the purpose of the SET1 pin on TPS3851G25EQDRBRQ1?

The SET1 pin on TPS3851G25EQDRBRQ1 controls watchdog enable/disable. When grounded (logic low), the watchdog is fully disabled and WDI is ignored - critical for development or bootloader phases. When high, watchdog operation resumes. Dynamic toggling is supported, with a 150 µs setup time required after enabling.

Is TPS3851G25EQDRBRQ1 compatible with wettable-flank optical inspection?

Yes, TPS3851G25EQDRBRQ1 uses a VSON-8 (DRB) package with wettable flanks, explicitly designed for automated optical inspection (AOI) of solder joints. The exposed thermal pad is internally connected to GND, and TI recommends soldering it to a large-area ground plane to ensure both thermal performance and reliable AOI contrast.