Texas Instruments TPS3850H25QDRCRQ1

Overview

TPS3850H25QDRCRQ1 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 TPS3850H25QDRCRQ1 datasheet, TPS3850H25QDRCRQ1 pinout, TPS3850H25QDRCRQ1 application, or TPS3850H25QDRCRQ1 equivalent, key selection considerations include its 0.8% voltage threshold accuracy across temperature, dual open-drain outputs (RESET/WDO), 10-pin VSON package with wettable flanks, watchdog disable capability via SET pins, and support for 4% or 7% fault windows with 0.5% hysteresis.

Technical Context

The TPS3850H25QDRCRQ1 implements a precision window comparator architecture on the SENSE pin, using trimmed resistor dividers and a stable internal reference to achieve ±0.8% overvoltage (VIT+(OV)) and undervoltage (VIT−(UV)) threshold accuracy from –40°C to +125°C. Its dual open-drain outputs-RESET and WDO-are independently controlled: RESET asserts on rail excursion outside the window and includes a user-selectable delay; WDO asserts only when the watchdog window is violated and RESET is deasserted.

Watchdog timing is configured via CWD (capacitor or pullup), SET0, and SET1 pins, enabling four discrete window ratios (1/8, 1/2, 3/4, disabled) and programmable upper/lower boundaries (e.g., tWDL = 1.48–2.22 ms, tWDU = 23.4–31.6 ms for 3/4 ratio). The device supports functional safety system design with documented failure modes, FIT rate data, and safety analysis reports available from TI.

Key Specifications

Pinout & Package

TPS3850H25QDRCRQ1 uses 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 applications.

Compared with TPS3850H25QDRCRQ1, TPS3851H25QDRCRQ1 adds manual reset but trades 0.8% accuracy for 1.2%, while MAX6373KA29+T omits watchdog entirely and lacks automotive qualification-making TPS3850H25QDRCRQ1 the optimal choice for ASIL-B-compliant window supervision with diagnostic watchdog capability.

Availability

TPS3850H25QDRCRQ1 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 TPS3850H25QDRCRQ1 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 and supervisory solutions.

The TPS3850-Q1 product line delivers AEC-Q100 Grade 1 voltage supervisors with integrated window watchdogs for functional safety–critical automotive systems-including ADAS, digital cockpits, and telematics-where deterministic fault detection and diagnostic coverage are mandatory.

FAQ

What is the voltage threshold accuracy of the TPS3850H25QDRCRQ1 over temperature?

The TPS3850H25QDRCRQ1 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 contributions from reference, resistor divider, and comparator offset drift. The accuracy applies directly to the TPS3850H25QDRCRQ1 variant, which is factory-configured for 2.5 V nominal SENSE threshold.

Does the TPS3850H25QDRCRQ1 support watchdog disable functionality?

Yes, the TPS3850H25QDRCRQ1 supports watchdog disable via logic-level configuration of the SET0 and SET1 pins. When SET0 = 1 and SET1 = 0 (both referenced to VDD), the watchdog timer is fully disabled, and the WDO output remains in high-impedance state regardless of WDI activity. This feature is explicitly documented in Section 6.6 of the datasheet and enables safe firmware development and bootloader operation without unintended timeouts. The TPS3850H25QDRCRQ1 retains full voltage supervision capability even when watchdog is disabled.

What package type and dimensions does the TPS3850H25QDRCRQ1 use?

The TPS3850H25QDRCRQ1 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 package is confirmed in the "Device Information" table of the datasheet and matches the orderable part number suffix DRCRQ1. No alternate packages are offered for this specific variant.

Can the TPS3850H25QDRCRQ1 monitor supply rails below 1.0 V?

No, the TPS3850H25QDRCRQ1 is factory-configured for 2.5 V nominal SENSE threshold and supports monitoring rails from 0.9 V to 5.0 V per datasheet Section 1 and Table 6-5. While the adjustable TPS3850H01Q1 variant can monitor down to 0.4 V using external resistive dividers, the H25 version has fixed internal resistor ratios optimized for 2.5 V. Attempting to monitor sub-0.9 V rails with TPS3850H25QDRCRQ1 will result in inaccurate or non-functional supervision.

What is the minimum reset timeout delay achievable with the TPS3850H25QDRCRQ1?

The minimum reset timeout delay for the TPS3850H25QDRCRQ1 is 170 ms when CRST is left unconnected (NC) and factory-programmed default timing is selected. If capacitor-based timing is used, the shortest supported delay is 703 µs, achieved with a 0.1 nF capacitor on the CRST pin per Section 6.3. This 703 µs value is a hard limit defined by internal timing circuitry and capacitor scaling factors-not a theoretical minimum-and applies identically across all temperature and supply conditions specified in the datasheet.