Texas Instruments TPS3850G09QDRCRQ1

Overview

TPS3850G09QDRCRQ1 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 TPS3850G09QDRCRQ1 datasheet, TPS3850G09QDRCRQ1 pinout, TPS3850G09QDRCRQ1 application, or TPS3850G09QDRCRQ1 equivalent, key selection criteria include its 0.8% voltage threshold accuracy, dual open-drain outputs (RESET/WDO), 10-pin VSON package with wettable flanks, programmable watchdog window ratios (1/8, 1/2, 3/4), and support for functional safety system design per ISO 26262.

Technical Context

The TPS3850G09QDRCRQ1 implements a dual-comparator window architecture on the SENSE pin with independent overvoltage (VIT+(OV)) and undervoltage (VIT−(UV)) thresholds, each trimmed to ±0.8% accuracy across temperature. Hysteresis is fixed at 0.5%, enabling stable operation in noisy automotive environments.

Its window watchdog uses a precision internal clock and configurable timing via CWD/SET0/SET1 pins to define upper (tWDU) and lower (tWDL) boundaries - e.g., tWDU = 46.8–63.3 ms and tWDL = 19.1–25.9 ms for 1/8 ratio - with dedicated WDO output for fault classification. Watchdog disable is supported via SET0/SET1 logic states.

Key Specifications

Pinout & Package

TPS3850G09QDRCRQ1 is housed in a 3.00-mm × 3.00-mm, 10-pin VSON 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 supervision and watchdog timer applications.

Compared with TPS3850G09QDRCRQ1, TPS3851G09QDRCRQ1 extends I/O voltage independence but increases complexity and cost, while MAX6373HATA+T sacrifices watchdog functionality and programmability for simplicity and legacy footprint compatibility.

Availability

TPS3850G09QDRCRQ1 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 TPS3850G09QDRCRQ1 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 ISO/TS 16949-certified manufacturing.

The TPS3850-Q1 product line delivers AEC-Q100 Grade 1 voltage supervisors with integrated window watchdogs specifically engineered for functional safety–compliant automotive ECU power management and fault detection.

FAQ

What is the voltage threshold accuracy of the TPS3850G09QDRCRQ1 over temperature?

The TPS3850G09QDRCRQ1 achieves ±0.8% maximum voltage threshold accuracy for both overvoltage (VIT+(OV)) and undervoltage (VIT−(UV)) detection across the full AEC-Q100 Grade 1 temperature range of –40°C to +125°C. This specification is verified per TI's production test flow and includes all process, voltage, and temperature variations - ensuring reliable reset assertion before microprocessor supply tolerance limits are exceeded in automotive environments.

How does the TPS3850G09QDRCRQ1 implement window watchdog functionality?

The TPS3850G09QDRCRQ1 implements window watchdog functionality using a precision internal clock and configurable timing inputs (CWD, SET0, SET1) to define independent upper (tWDU) and lower (tWDL) time boundaries. A valid falling edge on WDI must occur strictly between these boundaries; violation asserts WDO. The dedicated WDO output enables fault classification - distinguishing software hangs (WDO + RESET) from power faults (RESET only) - which is essential for ISO 26262 diagnostic coverage.

Can the TPS3850G09QDRCRQ1 monitor supply rails below 0.9 V?

No, the TPS3850G09QDRCRQ1 is specified to support common rails from 0.9 V to 5.0 V. Its internal precision reference and trimmed resistor divider are optimized for this range. For sub-0.9 V monitoring (e.g., 0.4 V core rails), TI recommends the adjustable variant TPS3850H01Q1, which uses external resistive feedback and monitors only undervoltage - not window-based OV/UV - and is not functionally identical to TPS3850G09QDRCRQ1.

What package type and dimensions does the TPS3850G09QDRCRQ1 use?

The TPS3850G09QDRCRQ1 uses a 3.00-mm × 3.00-mm, 10-pin VSON (DRC) package with wettable flanks. The thermal pad is internally connected to GND and must be soldered to a large-area ground plane per TI's layout guidelines. This compact, surface-mount package supports automated optical inspection and meets IPC/JEDEC standards for automotive reflow profiles.

Is functional safety documentation available for the TPS3850G09QDRCRQ1?

Yes, Texas Instruments provides functional safety–capable documentation for the TPS3850G09QDRCRQ1, including FIT rate data, failure mode effects and diagnostic analysis (FMEDA), and a safety manual. These resources are intended to aid system-level functional safety design per ISO 26262 ASIL-B requirements - though final safety certification remains the responsibility of the end-system integrator validating TPS3850G09QDRCRQ1 within their specific architecture.