Texas Instruments TPS3850G25QDRCRQ1

Overview

TPS3850G25QDRCRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified precision voltage supervisor with integrated programmable window watchdog timer. It monitors supply rails from 0.9 V to 5.0 V with ±0.8% threshold accuracy over –40°C to +125°C, delivers 10 µA typical supply current, and features factory-programmed or capacitor-adjustable reset (703 µs–3.22 s) and watchdog timeouts. It serves as a safety-critical power-rail monitor and fault-detection enabler in ADAS domain controllers.

For engineers reviewing the TPS3850G25QDRCRQ1 datasheet, TPS3850G25QDRCRQ1 pinout, TPS3850G25QDRCRQ1 application, or TPS3850G25QDRCRQ1 equivalent, key selection considerations include its dual over/undervoltage window detection with 0.5% hysteresis, open-drain RESET/WDO outputs, watchdog disable via SET pins, and VSON-10 wettable-flank packaging for automotive-grade optical inspection and solder-joint reliability.

Technical Context

The TPS3850G25QDRCRQ1 implements a dual-comparator window architecture on the SENSE pin, using trimmed resistive dividers and a precision reference to achieve 0.8% total threshold accuracy across temperature. Its state machine evaluates CRST and CWD pin configurations every time SENSE re-enters the valid window, with a fixed 381 µs initialization period (tINIT).

Watchdog timing uses a precision clock-driven window comparator: lower boundary (tWDL) and upper boundary (tWDU) are independently selectable via SET0/SET1 logic states and CWD pin configuration (NC, 10-kΩ pullup, or capacitor), supporting ratios of 1/8, 3/4, or 1/2 - with watchdog disable available when SET0=1, SET1=0.

Key Specifications

Pinout & Package

TPS3850G25QDRCRQ1 is housed in a 3.00 mm × 3.00 mm, 10-pin VSON package (DRC) with exposed thermal pad internally connected to GND. Wettable flanks support post-solder AOI verification per automotive manufacturing standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervision and watchdog applications.

Compared with TPS3851G25QDRCRQ1 and MAX6373KA29+T, the TPS3850G25QDRCRQ1 uniquely balances AEC-Q100 Grade 1 compliance, ±0.8% window accuracy, programmable watchdog timing, and 10-µA ultra-low IDD - making it optimal for ASIL-B–capable ADAS and cockpit systems where power, precision, and fault classification are co-constrained.

Availability

TPS3850G25QDRCRQ1 is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, digital cockpit processing units, and telematics control units requiring stable component supply with full AEC-Q100 traceability and long-term production support.

Supply support for TPS3850G25QDRCRQ1 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 electronics, with decades of experience delivering high-reliability components for safety-critical systems.

The TPS3850-Q1 product line was designed specifically for automotive functional safety applications, integrating precision supervision and window watchdog functionality into a single AEC-Q100 qualified device to simplify ASIL-B system design and reduce board space.

FAQ

What is the operating temperature range for the TPS3850G25QDRCRQ1?

The TPS3850G25QDRCRQ1 is qualified per AEC-Q100 Grade 1, supporting continuous operation from –40°C to +125°C ambient temperature. Its ±0.8% voltage threshold accuracy is guaranteed across this full range, enabling use in engine bay, ADAS sensor modules, and other thermally demanding automotive locations where the TPS3850G25QDRCRQ1 maintains reliable supervision without derating.

Does the TPS3850G25QDRCRQ1 support both overvoltage and undervoltage detection on the same rail?

Yes, the TPS3850G25QDRCRQ1 implements a true window comparator on the SENSE pin, simultaneously monitoring for both overvoltage (VIT+(OV)) and undervoltage (VIT–(UV)) faults. With 0.5% hysteresis and ±0.8% accuracy across temperature, the TPS3850G25QDRCRQ1 asserts RESET if the monitored rail falls below VIT–(UV) or rises above VIT+(OV), making it ideal for critical SoC power domains requiring bidirectional fault coverage.

How is the watchdog timeout configured on the TPS3850G25QDRCRQ1?

The TPS3850G25QDRCRQ1 supports three watchdog configuration methods: (1) factory-programmed default windows, (2) logic-selectable ratios (1/8, 3/4, 1/2) via SET0/SET1 pins, and (3) capacitor-programmable tWDU/tWDL boundaries using the CWD pin. The TPS3850G25QDRCRQ1's dedicated WDO output asserts only when WDI misses the active window while RESET is high - enabling precise fault classification not possible with standard timeout-only watchdogs.

Can the watchdog function be disabled on the TPS3850G25QDRCRQ1?

Yes, the TPS3850G25QDRCRQ1 watchdog can be fully disabled by setting SET0 = high and SET1 = low. In this state, the WDO output remains high-impedance regardless of WDI activity, and the TPS3850G25QDRCRQ1 operates solely as a precision voltage supervisor. This feature simplifies firmware development and safe-mode transitions without requiring external hardware changes or pullup/pulldown modifications.

What package type and mounting features does the TPS3850G25QDRCRQ1 use?

The TPS3850G25QDRCRQ1 uses a 3.00 mm × 3.00 mm, 10-pin VSON package (DRC) with wettable flanks. These flanks extend the solderable edge beyond the package body, enabling automated optical inspection (AOI) of solder joints - a critical requirement for automotive PCB assembly process control. The exposed thermal pad is internally connected to GND and must be soldered to a large-area ground plane for thermal performance.