Texas Instruments TPS3831G12DQNR

Overview

TPS3831G12DQNR from Texas Instruments is an ultralow-power voltage supervisor IC designed for supply monitoring in battery-critical systems. It features a factory-trimmed 1.1 V reset threshold, 150 nA typical supply current at 25°C, push-pull RESET output, and operates from 0.9 V to 6.5 V supply. It asserts active-low reset when VDD drops below threshold and holds reset for 200 ms after recovery - used in glucose monitors and wearables requiring long battery life.

For engineers reviewing the TPS3831G12DQNR datasheet, TPS3831G12DQNR pinout, TPS3831G12DQNR application, or TPS3831G12DQNR equivalent, key selection criteria include valid reset operation down to 0.6 V VDD, manual reset (MR) input support, ±1% threshold accuracy at 25°C, and X2SON-4 package compatibility with space-constrained PCB layouts.

Technical Context

The TPS3831G12DQNR implements a precision comparator-based supervision architecture with built-in hysteresis (11 mV typical) to prevent chatter during threshold crossing. Its sampling-based sensing scheme draws only ~15 µA for ~200 µs per measurement cycle, enabling 150 nA average quiescent current.

It integrates a 20 kΩ internal MR pullup resistor and supports bidirectional reset line interfacing via external series resistance. Reset assertion is triggered by either VDD falling below 1.1 V (VIT–) or MR pulled low, with independent propagation delays: 46 ns from MR low to RESET low and 20 µs from VDD falling edge.

Key Specifications

Pinout & Package

X2SON-4 (DQN) package: 1.00 mm × 1.00 mm, 0.4 mm pitch, thermal pad on bottom.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3831G12DQNR, TPS3831G12DBVR removes MR functionality to reduce size and cost, while MAX6371XR29+T trades 8× higher quiescent current for broader vendor availability - neither offers identical combination of 1.1 V threshold, MR support, and 150 nA I_Q in X2SON-4.

Availability

TPS3831G12DQNR is available at Aetrix Electronics and suitable for portable medical devices, industrial meters, and wearable electronics requiring stable component supply across extended production lifecycles.

Supply support for TPS3831G12DQNR 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 specializing in analog and embedded processing technologies, with leadership in low-power design and precision analog ICs.

The TPS383x product line was developed specifically for ultralow-power voltage supervision in battery-operated medical, metering, and portable electronics - prioritizing sub-µA quiescent current and factory-trimmed accuracy over feature count.

FAQ

What is the minimum supply voltage required for valid RESET output from the TPS3831G12DQNR?

The TPS3831G12DQNR guarantees a valid RESET output down to 0.6 V VDD, meaning it maintains correct logic state and drive capability even during deep brownout conditions. Below 0.6 V, the RESET output becomes undefined and must not be relied upon. This specification is confirmed in Section 7.5 Electrical Characteristics of the SBVS193D datasheet under parameter V(POR).

Does the TPS3831G12DQNR support manual reset, and how is the MR pin interfaced?

Yes, the TPS3831G12DQNR includes a dedicated MR (manual reset) input pin that forces RESET low when pulled to ≤0.3VDD. The MR pin has a 20 kΩ internal pullup to VDD, so it can be left floating if unused. When driven by an open-drain GPIO, no external pullup is needed; for push-pull drivers, ensure logic high reaches ≥0.7VDD to avoid excessive current draw through the internal resistor.

What is the reset delay time of the TPS3831G12DQNR, and is it adjustable?

The TPS3831G12DQNR has a fixed reset delay time of 200 ms typical (120–350 ms over temperature and process), which is factory-programmed and non-adjustable. This delay begins when VDD rises above the threshold + hysteresis and ensures sufficient hold time for microcontroller power stabilization. No external capacitor or resistor modifies this timing - it is inherent to the IC's internal oscillator and counter design.

Can the TPS3831G12DQNR operate from a 0.9 V supply, and what performance is guaranteed?

Yes, the TPS3831G12DQNR is fully specified to operate from 0.9 V to 6.5 V. At 0.9 V, it delivers 150 nA typical supply current, maintains 1.1 V ±1% threshold accuracy, and provides valid push-pull RESET output with VOL ≤ 0.4 V at 120 µA sink. All electrical characteristics in Section 7.5 of SBVS193D are validated across this full range, including operation at –40°C to +85°C ambient.

What package type and dimensions does the TPS3831G12DQNR use, and is thermal pad connection required?

The TPS3831G12DQNR uses the X2SON-4 (DQN) package: 1.00 mm × 1.00 mm body, 0.4 mm pin pitch, with an exposed thermal pad on the bottom. TI datasheet Section 13 specifies that the thermal pad must be soldered to a copper pour for mechanical stability and optimal thermal performance - leaving it unconnected risks solder joint reliability and may affect long-term parametric drift under thermal cycling.