Texas Instruments TPS3852H18QDRBRQ1

Overview

TPS3852H18QDRBRQ1 from Texas Instruments is a high-accuracy AEC-Q100 Grade 1 voltage supervisor with integrated window watchdog timer, designed for automotive safety-critical systems. It delivers 0.8% undervoltage threshold accuracy over –40°C to +125°C, ±15% factory-programmed watchdog/reset timing accuracy, and operates across 1.6 V to 6.5 V supply range. Its primary role is system-level power integrity monitoring and fault detection in ADAS vision processors and telematics control units.

For engineers reviewing the TPS3852H18QDRBRQ1 datasheet, TPS3852H18QDRBRQ1 pinout, TPS3852H18QDRBRQ1 application, or TPS3852H18QDRBRQ1 equivalent, key selection criteria include its precision 3.168 V (±0.8%) undervoltage threshold, user-selectable or factory-set watchdog window boundaries (e.g., 680–1840 ms), open-drain RESET/WDO outputs, manual reset input, and watchdog disable via SET1 - all in an automotive-qualified 3 mm × 3 mm VSON package.

Technical Context

The TPS3852H18QDRBRQ1 implements a precision bandgap-based undervoltage comparator with 0.5% hysteresis and a state-machine-driven window watchdog that requires falling-edge pulses on WDI within dynamically evaluated time windows (tWDL/max to tWDU/min). Its CWD pin supports three configuration modes: floating or 10-kΩ pullup for factory-programmed timing, or external capacitor (100 pF–1 µF) for user-adjustable timeout.

RESET assertion occurs when VDD falls below VITN = 3.168 V (±0.8%), with tRST = 200 ms (±15%) delay before deassertion after recovery. WDO asserts independently upon watchdog violation only when RESET is high, enabling fault isolation without full system reset - critical for ISO 26262-compliant diagnostics in automotive vision ECUs.

Key Specifications

Pinout & Package

TPS3852H18QDRBRQ1 is housed in an 8-pin VSON (DRB) package measuring 3.00 mm × 3.00 mm with exposed thermal pad connected internally to GND. Wettable flanks support solder-joint quality verification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3851H18QDRBRQ1 and MAX6373KA29D3+T, the TPS3852H18QDRBRQ1 uniquely combines automotive-grade accuracy (0.8%), window watchdog discrimination, and flexible timing configuration - making it the sole option for ASIL-B/C diagnostic coverage in modern ADAS vision systems.

Availability

TPS3852H18QDRBRQ1 is available at Aetrix Electronics and suitable for automotive ADAS systems, telematics control units, and FPGA-based vehicle gateways requiring stable component supply with guaranteed long-term automotive lifecycle support.

Supply support for TPS3852H18QDRBRQ1 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 and embedded processing technologies, with deep expertise in automotive-grade reliability and functional safety design.

The TPS3852-Q1 product line was developed specifically for ISO 26262-compliant automotive safety applications, delivering high-accuracy voltage monitoring and diagnostic-grade window watchdog functionality in compact, thermally robust packages.

FAQ

What is the exact undervoltage threshold voltage of the TPS3852H18QDRBRQ1?

The TPS3852H18QDRBRQ1 has a nominal undervoltage threshold (V_ITN) of 3.168 V, with guaranteed accuracy of ±0.8% over the full –40°C to +125°C operating temperature range. This value is factory-trimmed and verified per AEC-Q100 Grade 1 requirements, making it suitable for monitoring 3.3 V rails in automotive systems where tight tolerance is essential for functional safety compliance.

How does the TPS3852H18QDRBRQ1 implement window watchdog functionality?

The TPS3852H18QDRBRQ1 implements a true window watchdog by requiring falling-edge pulses on the WDI pin to occur strictly between two time boundaries: t_WDL(max) and t_WDU(min). If a pulse arrives too early (before t_WDL) or too late (after t_WDU), WDO asserts low. This dual-boundary detection distinguishes it from standard timeout watchdogs and enables detection of both software hang and runaway loop conditions - a key requirement for ASIL-B/C diagnostics.

Can the watchdog timer on the TPS3852H18QDRBRQ1 be disabled during development?

Yes, the watchdog timer on the TPS3852H18QDRBRQ1 can be fully disabled by grounding the SET1 pin. When SET1 = low, the watchdog circuit is inactive, WDI is ignored, and WDO enters high-impedance state. This allows safe firmware development and debugging without unintended resets, while maintaining full voltage supervision capability - eliminating the need for hardware modifications or jumper settings.

What package type and dimensions does the TPS3852H18QDRBRQ1 use?

The TPS3852H18QDRBRQ1 uses an 8-pin VSON (DRB) package measuring exactly 3.00 mm × 3.00 mm with 0.5 mm pitch. It features wettable flanks on all side pins and an exposed thermal pad internally connected to GND. This package supports automated optical inspection (AOI) and provides superior thermal performance (R_θJB = 22.2°C/W) for under-hood automotive applications.

Does the TPS3852H18QDRBRQ1 support multiple monitored voltage rails?

No, the TPS3852H18QDRBRQ1 monitors only the VDD supply rail directly. However, its 1.6 V to 6.5 V operating range supports supervision of common rails including 1.8 V, 2.5 V, 3.3 V, and 5.0 V without external resistive dividers. For multi-rail systems, multiple TPS3852H18QDRBRQ1 devices or companion supervisors like TPS3850xx-Q1 series are required - each dedicated to one rail with independent reset timing.