Texas Instruments TPS3852G33QDRBRQ1

Overview

TPS3852G33QDRBRQ1 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 monitors 3.3 V rails with ±0.8% threshold accuracy over –40°C to +125°C, features 200 ms reset timeout (±15%), 0.5% hysteresis, and open-drain RESET/WDO outputs - enabling reliable power-up sequencing and fault detection in ADAS vision modules.

For engineers reviewing the TPS3852G33QDRBRQ1 datasheet, TPS3852G33QDRBRQ1 pinout, TPS3852G33QDRBRQ1 application, or TPS3852G33QDRBRQ1 equivalent, key selection criteria include its factory-programmed watchdog timing (680–1840 ms window), manual reset input (MR), SET1 watchdog disable control, and VSON-8 wettable flank package for automated optical inspection in automotive PCB assembly.

Technical Context

The TPS3852G33QDRBRQ1 implements a precision undervoltage comparator with 0.8% VITN accuracy and 0.5% hysteresis, ensuring stable reset assertion before microcontroller minimum supply tolerance is violated. Its window watchdog uses dual timing boundaries (tWDL/tWDU) determined either by factory programming or external capacitor on CWD pin, with independent WDO output for fault isolation without full system reset.

Functional modes are governed by VDD level relative to VPOR (0.8 V), VITN (3.168 V), and VITN + VHYST. MR input forces immediate RESET assertion and disables watchdog; SET1 = GND disables watchdog entirely and places WDO in high-Z state. All outputs are open-drain, requiring external pullups (1–100 kΩ).

Key Specifications

Pinout & Package

TPS3852G33QDRBRQ1 is housed in a 3.00 mm × 3.00 mm, 8-pin VSON 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 supervision and watchdog applications.

Compared with TPS3852G33QDRBRQ1, TPS3851G33QDRBRQ1 omits window watchdog functionality and independent WDO, reducing diagnostic capability; MAX6373KA33+T lacks AEC-Q100 qualification and automotive temperature support, limiting use to non-automotive applications.

Availability

TPS3852G33QDRBRQ1 is available at Aetrix Electronics and suitable for automotive ADAS systems, telematics control units, and FPGA-based vehicle gateways requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3852G33QDRBRQ1 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 TPS385x-Q1 product line delivers AEC-Q100 qualified voltage supervisors with integrated window watchdogs, engineered specifically for functional safety compliance in automotive ADAS, infotainment, and body electronics.

FAQ

What is the nominal monitored voltage for TPS3852G33QDRBRQ1?

The TPS3852G33QDRBRQ1 is factory-configured for 3.3 V rail supervision, with a precise undervoltage threshold (VITN) of 3.168 V (3.3 V × 0.96). This value is guaranteed within ±0.8% over –40°C to +125°C, making it suitable for monitoring standard 3.3 V microcontroller and FPGA I/O supplies in automotive environments.

How does the window watchdog function differ from a standard watchdog in TPS3852G33QDRBRQ1?

The TPS3852G33QDRBRQ1 implements a true window watchdog that requires the WDI signal to fall within a defined time window - between tWDL (e.g., 800 ms) and tWDU (e.g., 1600 ms) - to avoid WDO assertion. Unlike standard watchdogs that only detect missed pulses, this architecture catches both early (stuck-loop) and late (hang) faults, fulfilling ISO 26262 ASIL-B diagnostic requirements.

Can TPS3852G33QDRBRQ1 be used without an external timing capacitor?

Yes, TPS3852G33QDRBRQ1 supports capacitor-free operation: leaving CWD unconnected or pulling it to VDD via a 10 kΩ resistor selects factory-programmed watchdog timing (e.g., 800/1600 ms window). This eliminates BOM cost and layout complexity while maintaining ±15% timing accuracy - ideal for production systems requiring certified timing without calibration.

What is the role of the SET1 pin in TPS3852G33QDRBRQ1 operation?

The SET1 pin in TPS3852G33QDRBRQ1 controls watchdog enable/disable functionality: grounding SET1 disables the watchdog timer and places WDO in high-impedance state, while pulling it high enables normal window watchdog operation. This allows safe boot sequences and development-mode testing without unintended timeouts, and is essential for systems requiring watchdog suspension during firmware updates.

Does TPS3852G33QDRBRQ1 support multiple supply voltage rails?

TPS3852G33QDRBRQ1 monitors its own VDD supply rail (1.6–6.5 V), which typically powers the 3.3 V domain it supervises. It does not monitor external rails directly; however, its high accuracy and hysteresis make it suitable for supervising 3.3 V LDO outputs feeding microcontrollers, FPGAs, or sensors. For multi-rail systems, separate TPS3852G33QDRBRQ1 units are used per critical rail.