Texas Instruments TPS3850H33DRCR

Overview

TPS3850H33DRCR from Texas Instruments is a precision voltage supervisor IC with integrated programmable window watchdog timer, designed for high-reliability power-rail monitoring in microcontroller and SoC 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 ±4% or ±7% fault windows on rails from 0.9 V to 5.0 V - used in ultrasound scanners and active antenna mMIMO systems.

For engineers reviewing the TPS3850H33DRCR datasheet, TPS3850H33DRCR pinout, TPS3850H33DRCR application, or TPS3850H33DRCR equivalent, key selection criteria include its factory-programmed vs capacitor-programmable reset/watchdog timing, dual-threshold hysteresis (0.5%), 10 µA typical supply current, and 3-mm × 3-mm VSON-10 package compatibility with space-constrained industrial and medical electronics.

Technical Context

The TPS3850H33DRCR implements a dual-comparator window architecture on the SENSE pin with independent overvoltage (VIT+(OV)) and undervoltage (VIT–(UV)) thresholds, each achieving ±0.8% accuracy across temperature. Its state-machine-controlled timing engine supports both factory-programmed default delays (9.5% accuracy) and external capacitor programming for RESET (tRST = 703 µs–3.22 s) and watchdog upper/lower boundaries (tWDU/tWDL).

Watchdog operation uses a dedicated WDI input with strict timing windows: valid transitions must occur between tWDL(max) and tWDU(min), with ratios selectable via SET0/SET1 as 1:8, 1:2, or 3:4 - enabling precise fault classification (early/late/valid). The device disables watchdog via logic-level SET pin configuration, not just pull-up resistors, and maintains functional isolation between RESET and WDO assertion states.

Key Specifications

Pinout & Package

TPS3850H33DRCR is housed in a 3.00-mm × 3.00-mm, 10-pin VSON package with exposed thermal pad internally connected to GND. The package supports reflow soldering per JEDEC J-STD-020 and requires thermal pad connection to a large-area ground plane for optimal thermal performance (RθJB = 26.1°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3851H33DRCR and MAX6373KA29+T, the TPS3850H33DRCR uniquely combines factory-programmed watchdog timing, 0.8% accuracy across full industrial temperature range, and true window supervision - making it the only option supporting deterministic fault classification in AAS and robotics applications without design compromises.

Availability

TPS3850H33DRCR is available at Aetrix Electronics and suitable for ultrasound scanner, storage area network, and active antenna mMIMO applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS3850H33DRCR 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 power management technologies, with over 50 years of innovation in high-reliability industrial and automotive electronics.

The TPS3850H33DRCR belongs to TI's precision voltage supervisor product line, engineered specifically for mission-critical systems requiring simultaneous overvoltage, undervoltage, and window watchdog monitoring with minimal external components.

FAQ

What is the operating temperature range for the TPS3850H33DRCR?

The TPS3850H33DRCR operates across a junction temperature range of –40°C to +125°C, with all electrical specifications-including 0.8% threshold accuracy and 10 µA supply current-guaranteed over this full industrial range. This makes the TPS3850H33DRCR suitable for under-hood automotive modules, outdoor telecom equipment, and industrial motor drives where ambient temperatures exceed 85°C.

How does the TPS3850H33DRCR implement window watchdog functionality?

The TPS3850H33DRCR implements window watchdog functionality through dedicated WDI input and WDO output, with lower (tWDL) and upper (tWDU) timing boundaries programmable via CWD capacitor and SET0/SET1 logic pins. Valid WDI falling edges must occur strictly between tWDL(max) and tWDU(min) to prevent WDO assertion - enabling classification of early, late, or valid transitions. The TPS3850H33DRCR supports ratios of 1:8, 1:2, and 3:4 for precise fault discrimination.

Can the TPS3850H33DRCR monitor multiple voltage rails simultaneously?

No, the TPS3850H33DRCR monitors only one voltage rail via its single SENSE pin. However, multiple TPS3850H33DRCR devices can be deployed in parallel to supervise different rails (e.g., VCORE, VI/O, analog supply) with independent reset and watchdog timing. Each TPS3850H33DRCR provides dedicated open-drain RESET and WDO outputs, allowing hierarchical fault handling in multi-rail systems without shared timing dependencies.

What are the factory-programmed timing options for the TPS3850H33DRCR?

The TPS3850H33DRCR offers factory-programmed RESET delay options of 170–230 ms (CRST = NC) or 8.5–11.5 ms (CRST = 10 kΩ to VDD), and watchdog timing options including tWDL/tWDU pairs of 19.1–25.9 ms / 46.8–63.3 ms (1:8 ratio), 680–920 ms / 1360–1840 ms (1:2 ratio), and 1.48–2.22 ms / 23.375–31.625 ms (3:4 ratio). These defaults eliminate external capacitors for standardized configurations while retaining programmability via CWD/CRST pins.

Does the TPS3850H33DRCR require external pull-up resistors on its outputs?

Yes, both RESET and WDO outputs are open-drain and require external pull-up resistors to VDD or appropriate logic rail. Recommended values range from 1 kΩ to 100 kΩ, selected based on VOL specification (≤0.4 V at 3 mA sink), capacitive loading, and leakage current (≤1 µA). For example, a 10-kΩ resistor ensures VOL ≤ 0.4 V while minimizing power draw - a key design consideration for the TPS3850H33DRCR's 10 µA typical supply current budget.