Texas Instruments TPS3850H30QDRCRQ1

Overview

TPS3850H30QDRCRQ1 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 (–40°C to +125°C), 0.5% hysteresis, and 10 µA typical supply current. It supports 0.9 V–5.0 V rails and features open-drain RESET/WDO outputs - used in ADAS domain controllers and digital cockpit processing units.

For engineers reviewing the TPS3850H30QDRCRQ1 datasheet, TPS3850H30QDRCRQ1 pinout, TPS3850H30QDRCRQ1 application, or TPS3850H30QDRCRQ1 equivalent, key selection criteria include factory-programmed vs capacitor-programmable reset/watchdog timing, 4%/7% fault window options, watchdog disable via SET pins, and wettable-flank VSON-10 package compatibility with automated optical inspection.

Technical Context

The TPS3850H30QDRCRQ1 implements a dual-comparator window architecture with trimmed resistor divider and precision reference to achieve 0.8% threshold accuracy across temperature. Its state machine evaluates CRST and CWD pin configurations every time SENSE re-enters the valid window, with 381 µs initialization delay (tINIT).

Watchdog operation uses independent upper/lower timing boundaries (tWDU/tWDL) set by CWD capacitor value and SET0/SET1 logic states, enabling ratios of 1/8, 1/2, or 3/4. RESET assertion occurs on SENSE excursion beyond VIT+(OV) or below VIT–(UV); deassertion requires both return to valid window and completion of tRST delay.

Key Specifications

Pinout & Package

TPS3850H30QDRCRQ1 is housed in a 3.00 mm × 3.00 mm, 10-pin VSON (DRC) package with exposed thermal pad connected internally to GND. Wettable flanks enable reliable solder-joint inspection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3850H30QDRCRQ1, TPS3851H30QDRCRQ1 adds manual reset capability at marginally higher cost and power, while MAX6373KA29+T sacrifices programmability, accuracy, and automotive qualification for basic fixed-threshold supervision.

Availability

TPS3850H30QDRCRQ1 is available at Aetrix Electronics and suitable for ADAS domain controllers, digital cockpit processing units, and automotive telematics control units requiring stable component supply under AEC-Q100 Grade 1 conditions.

Supply support for TPS3850H30QDRCRQ1 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 and embedded processing technologies, with deep expertise in automotive-grade power management and functional safety solutions.

The TPS3850-Q1 product line delivers precision voltage supervision and programmable window watchdog functionality specifically for automotive ECUs demanding AEC-Q100 Grade 1 operation and ISO 26262 readiness.

FAQ

What is the operating temperature range for the TPS3850H30QDRCRQ1?

The TPS3850H30QDRCRQ1 is qualified per AEC-Q100 Grade 1 with an ambient operating temperature range of –40°C to +125°C. This rating applies to the full device functionality including voltage supervision, watchdog timing, and open-drain output drive strength, validated across the entire range with ±0.8% threshold accuracy and 10 µA typical supply current.

How does the TPS3850H30QDRCRQ1 implement window watchdog functionality?

The TPS3850H30QDRCRQ1 implements window watchdog using two independent timing boundaries - tWDL (lower) and tWDU (upper) - set by CWD capacitor value and SET0/SET1 logic states. A falling edge on WDI must occur between these boundaries; missing either boundary asserts WDO. The watchdog can be fully disabled via SET pin combinations, eliminating spurious timeouts during development.

What package type and dimensions does the TPS3850H30QDRCRQ1 use?

The TPS3850H30QDRCRQ1 uses a 3.00 mm × 3.00 mm, 10-pin VSON (DRC) package with wettable flanks and an exposed thermal pad internally connected to GND. The package footprint supports high-density automotive PCB layouts and enables automated optical inspection of solder joints for improved manufacturing yield and field reliability.

Can the TPS3850H30QDRCRQ1 monitor voltage rails outside its VDD supply range?

Yes - the SENSE pin accepts input voltages from 0 V to 6.5 V regardless of VDD, which operates from 1.6 V to 6.5 V. This allows direct monitoring of higher-voltage rails (e.g., 5 V, 12 V via resistor divider) or lower-voltage rails (down to 0.9 V) without level-shifting circuitry, simplifying design and improving accuracy by avoiding external component tolerances.

What is the reset timeout accuracy of the TPS3850H30QDRCRQ1 when using factory-programmed settings?

When CRST is configured with a 10-kΩ pullup resistor to VDD, the TPS3850H30QDRCRQ1 uses factory-programmed reset timing with ±9.5% accuracy over temperature. This eliminates capacitor tolerance and aging effects, ensuring consistent reset hold time across production lots and lifetime operation in automotive environments.