Texas Instruments TPS3850H33QDRCRQ1

Overview

TPS3850H33QDRCRQ1 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, and features open-drain RESET/WDO outputs with factory- or capacitor-programmable timing - deployed in digital cockpit processing units and ADAS domain controllers.

For engineers reviewing the TPS3850H33QDRCRQ1 datasheet, TPS3850H33QDRCRQ1 pinout, TPS3850H33QDRCRQ1 application, or TPS3850H33QDRCRQ1 equivalent, this page provides verified functional safety-capable supervision parameters, validated watchdog window ratios (1/8, 1/2, 3/4), confirmed VSON-10 wettable-flank package compatibility, and real-world timing behavior under automotive thermal and ESD stress conditions.

Technical Context

The TPS3850H33QDRCRQ1 implements a dual-comparator window architecture with trimmed resistor divider and precision reference to achieve 0.8% threshold accuracy over temperature. Its state machine evaluates CRST and CWD pins every SENSE window entry with 381 µs initialization delay (tINIT), enabling dynamic reset/watchdog timeout selection.

Watchdog operation uses dedicated WDI input with strict timing windows: tWDL(min) to tWDU(max) boundaries are set via SET0/SET1 logic states and CWD configuration (NC or 10-kΩ pullup), supporting fault discrimination between early/late transitions. RESET assertion occurs on SENSE excursion beyond VIT+(OV) or below VIT−(UV), followed by factory- or capacitor-determined tRST delay before deassertion.

Key Specifications

Pinout & Package

TPS3850H33QDRCRQ1 is housed in a 3.00-mm × 3.00-mm, 10-pin VSON package with wettable flanks for automated optical inspection (AOI) and enhanced solder joint reliability in automotive PCB assemblies.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3850H33QDRCRQ1, the TPS3851H33QDRCRQ1 trades timing precision for lower cost, while the MAX6373KA29+T sacrifices both window supervision and programmable watchdog capability - making TPS3850H33QDRCRQ1 uniquely suited for ASIL-B automotive systems requiring dual-fault detection and deterministic timing.

Availability

TPS3850H33QDRCRQ1 is available at Aetrix Electronics and suitable for automotive telematics control units, ADAS domain controllers, digital cockpit processing units, and on-board wireless charger systems requiring stable component supply across extended product lifecycles.

Supply support for TPS3850H33QDRCRQ1 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-grade ICs, with decades of experience in high-reliability power management solutions.

The TPS3850-Q1 product line was engineered specifically for functional safety-critical automotive applications, combining precision voltage supervision and programmable window watchdog functionality in a single AEC-Q100 qualified device.

FAQ

What is the operating temperature range for the TPS3850H33QDRCRQ1?

The TPS3850H33QDRCRQ1 is qualified per AEC-Q100 Grade 1 with an ambient operating temperature range of –40°C to +125°C. This rating is validated across all electrical specifications including ±0.8% voltage threshold accuracy, 10-µA supply current, and watchdog timing parameters - ensuring reliable operation in engine compartment, ADAS sensor, and infotainment module environments where thermal stress is severe.

How does the TPS3850H33QDRCRQ1 implement window watchdog functionality?

The TPS3850H33QDRCRQ1 implements window watchdog functionality through dedicated WDI input and WDO output, with timing boundaries (tWDL and tWDU) determined by SET0/SET1 logic states and CWD pin configuration. A falling edge on WDI must occur strictly between these boundaries to prevent WDO assertion - enabling distinction between software hang (early/late edge) and valid operation. WDO only activates when RESET is high, isolating power faults from software faults.

Can the reset delay of the TPS3850H33QDRCRQ1 be adjusted externally?

Yes, the reset delay of the TPS3850H33QDRCRQ1 can be adjusted externally using a capacitor connected between the CRST pin and GND, supporting a range from 703 µs to 3.22 seconds. Alternatively, CRST may be left unconnected for factory-programmed delays (170–230 ms or 8.5–11.5 ms depending on internal configuration), or pulled up to VDD via a 10-kΩ resistor for fixed-delay options - providing flexibility for diverse boot timing requirements.

What package type does the TPS3850H33QDRCRQ1 use, and why is it significant for automotive applications?

The TPS3850H33QDRCRQ1 uses a 3.00-mm × 3.00-mm, 10-pin VSON package with wettable flanks. This design enables automated optical inspection (AOI) of solder joints - a critical requirement for zero-defect automotive manufacturing. The exposed thermal pad improves thermal dissipation in sealed enclosures, and the small footprint conserves PCB area in space-constrained modules like radar ECUs and telematics gateways.

Does the TPS3850H33QDRCRQ1 support functional safety compliance for ISO 26262?

Yes, the TPS3850H33QDRCRQ1 is functional safety-capable with documentation available to aid ISO 26262 ASIL-B system design. Texas Instruments provides FIT rate data, failure mode effect analysis (FMEA), and diagnostic coverage guidance - enabling integration into safety mechanisms for automotive power domains where supervised reset and watchdog functions contribute to hazard mitigation.