Texas Instruments TPS3850H01QDRCRQ1

Overview

TPS3850H01QDRCRQ1 from Texas Instruments is an AEC-Q100 Grade 1 precision voltage supervisor with integrated programmable window watchdog timer, designed for automotive power-rail monitoring. It delivers ±0.8% overvoltage/undervoltage threshold accuracy across –40°C to +125°C, supports 1.6 V–6.5 V supply, consumes only 10 µA typical supply current, and features open-drain RESET/WDO outputs. It is used in ADAS domain controllers to ensure microcontroller reset integrity during rail faults.

For engineers reviewing the TPS3850H01QDRCRQ1 datasheet, TPS3850H01QDRCRQ1 pinout, TPS3850H01QDRCRQ1 application, or TPS3850H01QDRCRQ1 equivalent, key selection considerations include its 0.5% hysteresis, factory-programmed or capacitor-adjustable reset/watchdog delays, 4%/7% fault window options, watchdog disable capability via SET pins, and wettable-flank VSON-10 package for automated optical inspection.

Technical Context

The TPS3850H01QDRCRQ1 implements a dual-comparator window architecture on the SENSE pin with independent, trimmed reference paths for VIT+(OV) and VIT−(UV), achieving 0.8% total accuracy over temperature. Its state machine evaluates CRST and CWD pins every time SENSE re-enters the valid window, with 381 µs initialization delay (tINIT) to determine external timing component configuration.

It integrates a dedicated window watchdog with selectable lower/upper boundaries (e.g., 19.1–63.3 ms typical tWDL/tWDU) determined by CWD capacitor value and SET0/SET1 logic states; WDO asserts only when RESET is high, enabling fault isolation. The adjustable H01 variant monitors rails down to 0.4 V using external resistor dividers and disables overvoltage detection per functional description.

Key Specifications

Pinout & Package

TPS3850H01QDRCRQ1 uses a 3.00 mm × 3.00 mm, 10-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 supervisor with watchdog applications.

Compared with TPS3850H01QDRCRQ1, TPS3851H01QDRCRQ1 adds diagnostic outputs but increases BOM count, while MAX6373KA29+T omits watchdog functionality and automotive qualification-making TPS3850H01QDRCRQ1 the optimal balance of precision, safety compliance, and integrated timing supervision.

Availability

TPS3850H01QDRCRQ1 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 lifecycle support.

Supply support for TPS3850H01QDRCRQ1 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 in high-reliability power management solutions.

The TPS3850-Q1 product line delivers AEC-Q100 Grade 1 voltage supervisors with integrated window watchdogs, engineered specifically for functional safety-critical automotive subsystems including ADAS, digital cockpits, and vehicle connectivity platforms.

FAQ

What is the voltage threshold accuracy of the TPS3850H01QDRCRQ1 over temperature?

The TPS3850H01QDRCRQ1 achieves ±0.8% maximum accuracy for both overvoltage (VIT+(OV)) and undervoltage (VIT−(UV)) thresholds across the full –40°C to +125°C operating range. This specification is validated per AEC-Q100 test conditions and includes contributions from reference, comparator, and resistor-divider trimming. The TPS3850H01QDRCRQ1 maintains this accuracy without external calibration, making it suitable for tight-tolerance automotive rails like 1.2 V VCORE or 1.8 V I/O.

How does the TPS3850H01QDRCRQ1 implement window watchdog functionality?

The TPS3850H01QDRCRQ1 implements a true window watchdog by generating two independent timing boundaries-tWDL (lower) and tWDU (upper)-based on CWD capacitor value and SET0/SET1 logic states. A valid WDI falling edge must occur strictly between these boundaries; early or late edges assert WDO. This enables fault classification (e.g., software hang vs. clock drift). The TPS3850H01QDRCRQ1's WDO only activates when RESET is high, preserving independent reset control.

Can the TPS3850H01QDRCRQ1 monitor sub-1 V rails?

Yes-the TPS3850H01QDRCRQ1 is the adjustable variant designed to monitor rails as low as 0.4 V using an external resistor divider on the SENSE pin. Unlike fixed-threshold versions, the H01 variant disables overvoltage detection and operates as a precision undervoltage monitor only. Its internal 0.4 V reference and trimmed divider allow accurate scaling; the SENSE pin itself accepts 0–6.5 V, enabling direct connection to higher rails without attenuation.

What package type and mounting features does the TPS3850H01QDRCRQ1 use?

The TPS3850H01QDRCRQ1 uses a 3.00 mm × 3.00 mm, 10-pin VSON package (DRC) with exposed thermal pad connected internally to GND. It features wettable flanks-vertical sidewalls plated with solderable finish-to enable automated optical inspection (AOI) of solder joint quality on bottom-side terminations. This is critical for automotive manufacturing traceability and zero-defect assembly requirements.

Does the TPS3850H01QDRCRQ1 support watchdog disable during development?

Yes-the TPS3850H01QDRCRQ1 supports hardware watchdog disable via logic levels on SET0 and SET1 pins. When SET0 = SET1 = high (≥0.8 × VDD), the watchdog is disabled regardless of CWD or WDI state. This eliminates spurious timeouts during firmware bring-up or debugging without requiring code changes. The TPS3850H01QDRCRQ1 maintains full reset supervision during disable mode, ensuring power-rail integrity remains enforced.