Texas Instruments TPS3850H01DRCR

Overview

TPS3850H01DRCR from Texas Instruments is a precision voltage supervisor IC with integrated programmable window watchdog timer, designed for high-reliability power-rail monitoring in microcontroller-based systems. It delivers 0.8% threshold accuracy over –40°C to +125°C, supports 1.6 V–6.5 V supply range, features open-drain RESET and WDO outputs, and enables tight-tolerance fault detection on rails from 0.9 V to 5.0 V - critical for ultrasound scanner and mMIMO antenna control.

For engineers reviewing the TPS3850H01DRCR datasheet, TPS3850H01DRCR pinout, TPS3850H01DRCR application, or TPS3850H01DRCR equivalent, this page provides verified functional identity, validated 10-pin VSON package mapping, confirmed watchdog window ratios (1/8, 1/2, 3/4), factory- and capacitor-programmable timing, and real-world use cases in safety-critical medical and telecom infrastructure.

Technical Context

The TPS3850H01DRCR implements dual independent timing paths: one for RESET delay (programmable via CRST pin using capacitor or 10-kΩ pullup) and another for window watchdog boundaries (tWDL/tWDU), both governed by precision internal clock and state machine. Its SENSE input monitors rail voltage with ±0.8% overvoltage (VIT+(OV)) and undervoltage (VIT−(UV)) threshold accuracy across full temperature range, plus 0.5% hysteresis to prevent chatter during marginal conditions.

Watchdog operation is configurable via SET0/SET1 logic inputs and CWD pin: combinations enable 1/8, 1/2, or 3/4 watchdog window ratios, disable watchdog entirely, or select factory-programmed timeouts (e.g., tWDL = 19.1–25.9 ms, tWDU = 46.8–63.3 ms). WDO asserts only when RESET is high, ensuring coordinated fault signaling without race conditions.

Key Specifications

Pinout & Package

TPS3850H01DRCR is housed in a 3.00 mm × 3.00 mm, 10-pin VSON (DRC) package with exposed thermal pad connected internally to GND. The package supports high-density PCB layouts and efficient heat dissipation via thermal pad soldering to ground plane.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervisor with watchdog timer applications.

Compared with TPS3850H01DRCR, TPS3851H01DRCR adds power-path control at higher cost and quiescent current, while MAX6373KA29+T sacrifices programmability and accuracy for compactness and price - making TPS3850H01DRCR optimal for new designs demanding precision, configurability, and thermal efficiency in 3×3 mm space.

Availability

TPS3850H01DRCR is available at Aetrix Electronics and suitable for ultrasound scanner, Active Antenna System mMIMO (AAS), and infusion pump applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for medical and telecom certifications.

Supply support for TPS3850H01DRCR 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 decades of expertise in high-reliability power management and supervisory ICs.

The TPS3850 family was engineered specifically for mission-critical embedded systems needing simultaneous precision voltage monitoring and intelligent window watchdog functionality - targeting medical imaging, 5G infrastructure, and industrial automation.

FAQ

What is the primary function of the TPS3850H01DRCR?

The TPS3850H01DRCR is a precision voltage supervisor IC with an integrated programmable window watchdog timer. It continuously monitors a target voltage rail via the SENSE pin, asserts RESET on overvoltage or undervoltage events with ±0.8% accuracy, and independently validates system firmware execution via the WDO output - all within a 3-mm × 3-mm VSON package. Its dual-timing architecture makes it ideal for safety-critical applications where both power integrity and software liveliness must be assured.

How does the watchdog window ratio affect system reliability in the TPS3850H01DRCR?

The TPS3850H01DRCR supports three watchdog window ratios - 1/8, 1/2, and 3/4 - selected via SET0, SET1, and CWD pins. A 1/8 ratio provides narrow timing tolerance for fast-fault detection in time-critical subsystems, while a 1/2 ratio balances sensitivity and noise immunity for general-purpose microcontrollers. The 3/4 ratio extends the valid WDI pulse window, reducing false timeouts in systems with variable interrupt latency. Each ratio directly defines the relationship between tWDL and tWDU, enabling precise alignment with actual firmware execution timing margins.

Can the TPS3850H01DRCR monitor multiple voltage rails simultaneously?

No, the TPS3850H01DRCR monitors only one voltage rail per device via its single SENSE input. However, multiple TPS3850H01DRCR units can be deployed in parallel to supervise different rails - for example, one for 1.2-V VCORE, another for 3.3-V I/O, and a third for 5.0-V analog - each with independent RESET and WDO outputs. This distributed approach maintains timing accuracy and avoids cross-rail coupling issues inherent in multiplexed solutions.

What is the role of the CRST pin in the TPS3850H01DRCR?

The CRST pin on the TPS3850H01DRCR determines the RESET delay duration (tRST). It accepts three configurations: left unconnected (NC) for factory-programmed 200-ms default, pulled up to VDD via 10-kΩ resistor for 10-ms delay, or connected to a capacitor (0.1–1000 nF) for user-defined delays from 703 µs to 3.22 s. The device re-evaluates CRST state each time SENSE re-enters its valid window, ensuring dynamic adaptability during complex power-up sequences.

Does the TPS3850H01DRCR require external passive components for basic operation?

Yes - the TPS3850H01DRCR requires external pullup resistors (1–100 kΩ) on RESET and WDO outputs to establish defined high states, a 0.1-µF bypass capacitor on VDD for noise suppression, and optionally a timing capacitor on CRST or CWD for programmable delays. No external components are needed for factory-default timing operation, but pullups and bypassing remain mandatory for functional reliability across all configurations.