Texas Instruments TPS3850H01DRCT

Overview

TPS3850H01DRCT 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/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 systems.

For engineers reviewing the TPS3850H01DRCT datasheet, TPS3850H01DRCT pinout, TPS3850H01DRCT application, or TPS3850H01DRCT 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 medical, telecom, and industrial control systems.

Technical Context

The TPS3850H01DRCT implements dual independent timing paths: one for RESET delay (tRST = 170–230 ms factory default or 703 µs–3.22 s capacitor-programmable) and another for window watchdog boundaries (tWDL/tWDU spanning 1.48 ms–1.84 s depending on SET0/SET1/CWD configuration). Its precision voltage comparator uses trimmed references achieving ±0.8% VIT+(OV) and VIT−(UV) accuracy across temperature, with 0.5% hysteresis to reject rail noise.

Watchdog operation requires valid WDI edge transitions within dynamically configurable lower (tWDL) and upper (tWDU) time boundaries - e.g., with SET0=0/SET1=1 and CWD=NC, tWDL = 1.48–2.22 ms and tWDU = 23.4–31.6 ms - enabling fault classification (early vs. late timeout) via dedicated WDO assertion. The device disables watchdog via logic-level SET pin combinations without requiring external circuitry.

Key Specifications

Pinout & Package

TPS3850H01DRCT 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 automated optical inspection and offers low thermal resistance (R_θJA = 52.3°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3851H01DRCT, the TPS3850H01DRCT omits MR for simplified layout and lower gate count; versus MAX6373KA29+T, it trades fixed threshold simplicity for field-programmable timing and tighter ±0.8% accuracy - making it optimal for multi-rail, safety-critical systems demanding fault classification.

Availability

TPS3850H01DRCT is available at Aetrix Electronics and suitable for ultrasound scanner design, active antenna system deployment, and robot servo drive development requiring stable component supply across extended temperature and long product lifecycles.

Supply support for TPS3850H01DRCT 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 decades of experience in high-reliability industrial and automotive ICs.

The TPS3850H01DRCT belongs to TI's precision supervisory IC portfolio, engineered specifically for systems requiring simultaneous rail monitoring and intelligent watchdog diagnostics - targeting medical imaging, 5G infrastructure, and industrial automation.

FAQ

What is the key functional distinction of TPS3850H01DRCT versus basic reset supervisors?

The TPS3850H01DRCT integrates a programmable window watchdog timer alongside precision voltage supervision - unlike basic supervisors that only monitor rail levels. This allows it to detect not just power faults but also software hangs, with diagnostic capability via separate WDO assertion timed relative to RESET. Its ±0.8% threshold accuracy and 0.5% hysteresis further differentiate it in noise-prone environments where TPS3850H01DRCT ensures deterministic behavior.

How does the SENSE pin bias current of TPS3850H01DRCT impact system design?

The TPS3850H01DRCT specifies ±50 nA SENSE pin idle current - significantly lower than standard variants (2.1–2.5 µA). This minimizes loading on high-impedance reference dividers or sensor signal chains, preserving measurement accuracy in precision analog subsystems. For example, when monitoring a 5 V rail via a 1 MΩ/1 MΩ divider, TPS3850H01DRCT introduces <50 µV error versus >2 mV for higher-bias alternatives - critical in medical-grade ultrasound front-ends.

Can TPS3850H01DRCT support both factory-programmed and user-adjustable timing simultaneously?

Yes - TPS3850H01DRCT supports concurrent factory and user programming: CRST and CWD pins accept either NC/resistor (for factory-set tRST/tWDU) or external capacitors (for user-defined timing). The internal state machine evaluates pin states at each valid SENSE window entry, allowing mixed-mode use - e.g., factory-default watchdog with capacitor-tuned reset delay - without firmware overhead. This flexibility is documented in Section 6.6 timing tables for TPS3850H01DRCT.

What watchdog window ratios are available on TPS3850H01DRCT and how are they selected?

TPS3850H01DRCT offers three watchdog window ratios: 1/8, 3/4, and 1/2 - selected exclusively by SET0 and SET1 logic levels (CWD configures timing magnitude). With SET0=0/SET1=0: 1/8 ratio; SET0=0/SET1=1: 3/4; SET0=1/SET1=1: 1/2. These ratios define the tWDL/tWDU relationship, enabling fault classification - e.g., 3/4 ratio widens the valid WDI window for tolerant applications, while 1/8 tightens it for rapid hang detection. All ratios are validated in TPS3850H01DRCT's electrical characteristics table.

Is thermal pad connection mandatory for TPS3850H01DRCT operation?

Yes - the exposed thermal pad on the TPS3850H01DRCT VSON package is internally connected to GND and must be soldered to a large-area ground plane. This is required for both thermal performance (R_θJB = 26.1°C/W) and electrical stability, as the pad forms part of the GND reference path. Omitting thermal pad connection risks exceeding junction temperature limits under sustained load and may cause erratic reset timing due to ground bounce - per TI's PCB layout guidelines for TPS3850H01DRCT.