Texas Instruments TPS3831L30DQNR

Overview

TPS3831L30DQNR from Texas Instruments is an ultralow-power voltage supervisor IC designed for single-rail supply monitoring in battery-critical systems. It features a factory-trimmed 2.63 V reset threshold, 150 nA typical supply current at 25°C, push-pull RESET output, and operates across 0.9 V to 6.5 V supply range - enabling use in glucose monitors, wearables, and portable metering equipment.

For engineers reviewing the TPS3831L30DQNR datasheet, TPS3831L30DQNR pinout, TPS3831L30DQNR application, or TPS3831L30DQNR equivalent, key selection considerations include its 2.63 V threshold accuracy (±1% at 25°C), 200 ms reset delay, manual reset (MR) input support, and X2SON-4 package compatibility with space-constrained PCB layouts.

Technical Context

The TPS3831L30DQNR implements a precision comparator-based supervision architecture with built-in hysteresis (26 mV typical) to prevent chatter during supply recovery. Its internal sampling circuit draws only ~15 µA for ~200 µs per measurement cycle, sustaining average quiescent current at 150 nA.

It asserts active-low RESET when VDD falls below 2.63 V (VIT–), holds RESET low for ≥120 ms after VDD rises above VIT– + Vhys, and supports manual reset assertion via MR pin - a feature exclusive to the TPS3831 family, not present in TPS3839 variants.

Key Specifications

Pinout & Package

X2SON-4 (DQN) package: 1.00 mm × 1.00 mm, 0.4 mm pitch, thermal pad on bottom. Compatible with standard reflow profiles (MSL Level-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3831L30DQNR, TPS3831K33DQNR offers higher threshold for cleaner 3.3 V supervision, while TPS3839L30DQNR trades MR functionality for reduced pin count and package size - making each suitable for distinct system-level reset architecture requirements.

Availability

TPS3831L30DQNR is available at Aetrix Electronics and suitable for portable medical devices, industrial metering, wearable electronics, and battery-powered IoT edge nodes requiring stable component supply across long product lifecycles.

Supply support for TPS3831L30DQNR 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 company delivering analog and embedded processing solutions, with leadership in low-power design and precision analog IP.

The TPS3831 series belongs to TI's ultralow-power voltage supervisor product line, engineered specifically for battery longevity and robust operation in portable, medical, and industrial sensing applications where sub-µA quiescent current and factory-trimmed thresholds are mandatory.

FAQ

What is the exact reset threshold voltage of the TPS3831L30DQNR?

The TPS3831L30DQNR has a factory-trimmed negative-going threshold voltage (VIT–) of 2.63 V, with ±1% accuracy at 25°C and ±1.5% over –40°C to +85°C. This value is laser-trimmed during production and does not require external calibration. The TPS3831L30DQNR maintains this specification across its full 0.9 V to 6.5 V operating range.

Does the TPS3831L30DQNR support manual reset functionality?

Yes, the TPS3831L30DQNR includes a dedicated MR (manual reset) input pin that allows external logic or a pushbutton to force the RESET output low, independent of VDD level. The MR pin features an internal 20 kΩ pullup to VDD, so it may be left floating if unused. This functionality distinguishes the TPS3831L30DQNR from the MR-less TPS3839 family.

What is the reset delay time of the TPS3831L30DQNR and how is it determined?

The TPS3831L30DQNR provides a typical reset delay time (td) of 200 ms after VDD rises above the threshold + hysteresis. This delay is fixed internally and specified from 120 ms (min) to 350 ms (max) over temperature. It ensures sufficient hold time for microcontrollers to complete power-up initialization and clock stabilization before releasing reset.

Can the TPS3831L30DQNR operate from a 1.2 V supply?

Yes, the TPS3831L30DQNR operates from 0.9 V to 6.5 V, including 1.2 V. At 1.2 V, it delivers valid RESET output with VOL ≤ 0.4 V (IOL = 1 µA) and maintains 150 nA typical supply current. Its ability to assert RESET down to 0.6 V ensures deterministic behavior even during deep brownout conditions common in single-cell alkaline or NiMH systems.

What package type is used for the TPS3831L30DQNR and what are its key mechanical features?

The TPS3831L30DQNR uses the X2SON-4 (DQN) package: 1.00 mm × 1.00 mm body, 0.4 mm pin pitch, and an exposed thermal pad on the bottom. It is RoHS-compliant, MSL Level-1 rated, and compatible with standard reflow soldering. The compact footprint supports high-density layouts in wearables and portable diagnostics equipment.