Texas Instruments TPS3850H12DRCR

Overview

TPS3850H12DRCR from Texas Instruments is a precision voltage supervisor IC with integrated programmable window watchdog timer, designed for high-reliability microcontroller and SoC power-rail monitoring. 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 operates with only 10 µA typical supply current. It is used in ultrasound scanners and active antenna systems where tight tolerance fault detection and deterministic watchdog timing are critical.

For engineers reviewing the TPS3850H12DRCR datasheet, TPS3850H12DRCR pinout, TPS3850H12DRCR application, or TPS3850H12DRCR equivalent, key selection criteria include its ±4%/±7% factory-selectable fault windows, 0.5% hysteresis, user-programmable reset delay (703 µs–3.22 s), window watchdog ratio configurability (1/8, 3/4, 1/2), and VSON-10 thermal-pad package compatibility with industrial and medical embedded designs.

Technical Context

The TPS3850H12DRCR implements a dual-threshold window comparator on the SENSE pin with independent overvoltage (VIT+(OV)) and undervoltage (VIT–(UV)) detection, each achieving 0.8% accuracy across temperature. Its internal precision clock drives both the reset timeout counter and the window watchdog state machine, enabling accurate timing without external crystals.

Watchdog operation is defined by two boundaries-tWDL (lower) and tWDU (upper)-with ratios set via SET0/SET1 logic inputs and CWD capacitor/resistor configuration. The device supports watchdog disable via SET pin combinations and includes glitch-immune SENSE input with propagation delay under 40 ns at full overdrive.

Key Specifications

Pinout & Package

TPS3850H12DRCR is housed in a 3.00 mm × 3.00 mm, 10-pin VSON package (DRC) with exposed thermal pad internally connected to GND. The package supports high-density PCB layouts and efficient heat dissipation in thermally constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3851H12DRCR, the TPS3850H12DRCR lacks MR but reduces component count and cost in watchdog-centric designs; versus MAX6373KA29+T, it provides full window watchdog programmability and tighter threshold accuracy at the expense of package size and design complexity.

Availability

TPS3850H12DRCR is available at Aetrix Electronics and suitable for ultrasound scanners, storage area networks, active antenna systems, and robot servo drives requiring stable component supply across extended temperature and long product lifecycles.

Supply support for TPS3850H12DRCR 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 IC design.

The TPS3850 family was developed to address demand for integrated, high-accuracy power supervision in safety-critical embedded systems-specifically targeting medical imaging, industrial automation, and 5G infrastructure where deterministic fault response is non-negotiable.

FAQ

What is the operating voltage range supported by the TPS3850H12DRCR?

The TPS3850H12DRCR supports an input voltage range of 1.6 V to 6.5 V on its VDD pin, enabling direct interface with common logic rails including 1.2 V, 1.8 V, 3.3 V, and 5 V. Its SENSE pin monitors supply voltages from 0.9 V to 5.0 V with ±4% or ±7% fault windows, making the TPS3850H12DRCR suitable for multi-rail systems where precise, independent supervision is required without level-shifting circuitry.

How does the TPS3850H12DRCR achieve 0.8% voltage threshold accuracy?

The TPS3850H12DRCR achieves 0.8% overvoltage (VIT+(OV)) and undervoltage (VIT–(UV)) threshold accuracy across –40°C to +125°C through laser-trimmed internal references and matched resistor ladders, validated per unit during final test. This specification is guaranteed in production and reflected in statistical histograms showing >99% of units within ±0.5% at 25°C. The TPS3850H12DRCR maintains this accuracy without external calibration, reducing system-level validation effort.

Can the watchdog timer in the TPS3850H12DRCR be disabled during development?

Yes, the watchdog timer in the TPS3850H12DRCR can be disabled using specific logic states on the SET0 and SET1 pins-for example, SET0 = high and SET1 = low disables the watchdog function entirely. When disabled, the WDI input is ignored, and WDO remains high-impedance unless asserted by RESET. This allows safe firmware debugging without unintended timeouts, and the TPS3850H12DRCR retains full voltage supervision capability during this mode.

What package type and thermal characteristics does the TPS3850H12DRCR use?

The TPS3850H12DRCR uses a 3.00 mm × 3.00 mm, 10-pin VSON package (DRC) with an exposed thermal pad internally connected to GND. Its junction-to-board thermal resistance (RθJB) is 26.1°C/W, and junction-to-ambient (RθJA) is 52.3°C/W-enabling reliable operation up to +125°C ambient when mounted on 2 oz copper with ≥2 cm² ground pour. The TPS3850H12DRCR's compact footprint supports high-density PCB layouts in space-constrained medical and telecom modules.

How is the reset delay time configured on the TPS3850H12DRCR?

The reset delay time on the TPS3850H12DRCR is configured via the CRST pin: connecting a capacitor (0.1–1000 nF) between CRST and GND yields delays from 703 µs to 3.22 s, calculated using Equation 3 in the datasheet; a 10-kΩ pullup to VDD selects a factory-programmed 10 ms default; leaving CRST unconnected selects another factory option (200 ms). The TPS3850H12DRCR evaluates CRST configuration within 381 µs (tINIT) after SENSE enters the valid window.