Texas Instruments TPS3850H12QDRCRQ1

Overview

TPS3850H12QDRCRQ1 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 open-drain RESET and WDO outputs. It is used in ADAS domain controllers to ensure microcontroller reliability during power-up, brownout, and software hang conditions.

For engineers reviewing the TPS3850H12QDRCRQ1 datasheet, TPS3850H12QDRCRQ1 pinout, TPS3850H12QDRCRQ1 application, or TPS3850H12QDRCRQ1 equivalent, key selection criteria include its 0.5% hysteresis, factory-programmed or capacitor-adjustable reset delay (703 µs to 3.22 s), user-selectable watchdog window ratios (1/8, 1/2, 3/4), and wettable-flank VSON-10 package for automated optical inspection.

Technical Context

The TPS3850H12QDRCRQ1 implements a dual-comparator window architecture on the SENSE pin with independent overvoltage (VIT+(OV)) and undervoltage (VIT–(UV)) thresholds, both trimmed to ±0.8% accuracy across temperature. Its internal precision clock drives both the reset timeout counter and the window watchdog state machine, enabling deterministic timing with 9.5% factory-programmed delay accuracy.

Watchdog functionality is configured via SET0/SET1 logic inputs and CWD capacitor/resistor programming, supporting three distinct window ratios and watchdog disable mode. The device uses separate timing paths for tWDL (lower boundary) and tWDU (upper boundary), with propagation delays under 35 µs for overvoltage events and 17 µs for undervoltage events at VDD = 5 V.

Key Specifications

Pinout & Package

TPS3850H12QDRCRQ1 is housed in 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 supervision and watchdog applications.

Compared with TPS3850H12QDRCRQ1, TPS3851H12QDRCRQ1 adds NMI capability without changing footprint or timing behavior, while MAX6373KA29+T sacrifices accuracy, programmability, and watchdog functionality for lower cost and smaller size in non-automotive roles.

Availability

TPS3850H12QDRCRQ1 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 TPS3850H12QDRCRQ1 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for automotive, industrial, and personal electronics markets.

The TPS3850-Q1 product line is designed specifically for functional safety–compliant automotive systems, integrating precision voltage monitoring and window watchdog functionality into a single AEC-Q100 qualified device for ASIL-B–capable architectures.

FAQ

What is the operating temperature range for the TPS3850H12QDRCRQ1?

The TPS3850H12QDRCRQ1 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 parameters including threshold accuracy, reset delay, and watchdog timing, making it suitable for under-hood and cockpit-mounted automotive ECUs where thermal stress is severe.

Does the TPS3850H12QDRCRQ1 support adjustable voltage thresholds?

No, the TPS3850H12QDRCRQ1 has factory-trimmed, fixed voltage thresholds optimized for 1.2-V rails. Its SENSE pin monitors the target rail directly, and the 0.8% accuracy applies to both overvoltage and undervoltage thresholds without external resistor networks. Adjustable versions like TPS3850H01Q1 exist but use different internal reference configurations.

How is watchdog disable implemented on the TPS3850H12QDRCRQ1?

Watchdog disable on the TPS3850H12QDRCRQ1 is achieved by setting CWD to NC (no connection) and configuring SET0/SET1 to 1/0. This combination places the watchdog in disabled mode per Table 6-6, preventing WDO assertion regardless of WDI activity. When disabled, WDI must be actively driven to VDD or GND - it cannot float.

What package type and dimensions does the TPS3850H12QDRCRQ1 use?

The TPS3850H12QDRCRQ1 uses a 3.00-mm × 3.00-mm, 10-pin VSON package (DRC) with wettable flanks. The thermal pad is internally connected to GND and must be soldered to a large-area ground plane per Section 6.4 thermal guidelines. This package supports AOI and meets IPC-7351B standards for automotive reflow profiles.

Can the TPS3850H12QDRCRQ1 monitor rails below 0.9 V?

No, the TPS3850H12QDRCRQ1 is specified for monitoring rails from 0.9 V to 5.0 V. Its internal reference and comparator design are optimized for this range. For sub-0.9-V rails, TI recommends the TPS3850H01Q1 variant, which supports down to 0.4 V using external resistor dividers - but that part operates in undervoltage-only mode, not window mode.