Texas Instruments TPS3850H50QDRCRQ1

Overview

TPS3850H50QDRCRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-grade 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, features open-drain RESET and WDO outputs, and supports factory- or capacitor-programmable reset and watchdog timeouts - used in ADAS domain controllers and digital cockpit processing units.

For engineers reviewing the TPS3850H50QDRCRQ1 datasheet, TPS3850H50QDRCRQ1 pinout, TPS3850H50QDRCRQ1 application, or TPS3850H50QDRCRQ1 equivalent, key selection criteria include its 0.8% voltage threshold accuracy, 10 µA typical supply current, 3-mm × 3-mm VSON-10 wettable-flank package, dual over/undervoltage detection with 0.5% hysteresis, and user-selectable watchdog window ratios (1/8, 1/2, 3/4).

Technical Context

The TPS3850H50QDRCRQ1 implements a dual-comparator window architecture on the SENSE pin with independent, trimmed reference paths for VIT+(OV) and VIT–(UV), achieving 0.8% total accuracy across temperature. Its internal state machine evaluates CRST and CWD pins every valid-window entry with 381 µs initialization delay (tINIT) to configure timing modes.

Watchdog operation uses a precision clock-driven timing engine where WDI edge timing must fall strictly between tWDL(max) and tWDU(min); dedicated WDO output provides fault-type resolution (early vs. late timeout). SET0/SET1 logic inputs select fixed watchdog ratios or disable functionality without external components.

Key Specifications

Pinout & Package

TPS3850H50QDRCRQ1 is housed in a 3.00-mm × 3.00-mm, 10-pin VSON package with exposed thermal pad connected internally to GND. Wettable flanks support solder-joint quality verification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3850H50QDRCRQ1, TPS3851H50QDRCRQ1 adds MR input at minor cost premium for enhanced safety flexibility, while MAX6373KA29+T omits window watchdog and programmability - making it inadequate for ADAS or digital cockpit use cases requiring fault-type discrimination.

Availability

TPS3850H50QDRCRQ1 is available at Aetrix Electronics and suitable for automotive ADAS domain controllers, digital cockpit processing units, and telematics control units requiring stable component supply under AEC-Q100 compliance and long-term lifecycle assurance.

Supply support for TPS3850H50QDRCRQ1 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 IC design and functional safety certification.

TPS3850H50QDRCRQ1 belongs to TI's automotive precision supervisor product line, engineered specifically for ISO 26262-compliant systems requiring simultaneous voltage monitoring and deterministic software execution verification.

FAQ

What is the voltage threshold accuracy of the TPS3850H50QDRCRQ1 over temperature?

The TPS3850H50QDRCRQ1 achieves ±0.8% maximum voltage threshold accuracy for both overvoltage (VIT+(OV)) and undervoltage (VIT–(UV)) detection across the full AEC-Q100 Grade 1 range of –40°C to +125°C ambient temperature. This specification is verified per TI's production test flow and includes contributions from reference, comparator, and resistor-divider trimming - enabling reliable reset assertion before microprocessor supply limits are breached.

How does the TPS3850H50QDRCRQ1 implement window watchdog functionality?

The TPS3850H50QDRCRQ1 implements a true window watchdog using two independent timing boundaries: tWDL (lower) and tWDU (upper). A falling edge on WDI must occur strictly between these boundaries to prevent WDO assertion. The boundaries are set via CWD capacitor value and SET0/SET1 logic states, supporting ratios of 1/8, 1/2, or 3/4 - allowing precise alignment with software task deadlines in safety-critical firmware.

Can the TPS3850H50QDRCRQ1 monitor supply rails below 0.9 V?

No - the TPS3850H50QDRCRQ1 is specified for precision monitoring of rails from 0.9 V to 5.0 V. Its internal reference and comparator architecture is optimized for this range; attempting to monitor sub-0.9-V rails results in degraded accuracy and undefined behavior. For lower-voltage rails (e.g., 0.4 V), TI recommends the TPS3850H01Q1 variant, which operates in undervoltage-only mode with external resistor divider.

What package type and mounting features does the TPS3850H50QDRCRQ1 use?

The TPS3850H50QDRCRQ1 uses a 3.00-mm × 3.00-mm, 10-pin VSON package (DRC) with wettable flanks. The exposed thermal pad is internally connected to GND and must be soldered to a large-area ground plane. Wettable flanks enable automated optical inspection (AOI) of solder joints - a critical requirement for zero-defect automotive PCB assembly processes.

Does the TPS3850H50QDRCRQ1 support watchdog disable during development?

Yes - the TPS3850H50QDRCRQ1 supports hardware watchdog disable via logic-level configuration of SET0 and SET1 pins. When SET0 = 1 and SET1 = 0 (or SET0 = 1 and SET1 = 1 with CWD pulled up), the watchdog engine is disabled and WDI is ignored. This allows safe firmware development and debugging without unintended WDO assertions, while maintaining full voltage supervision functionality.