Texas Instruments TPS3831G18DQNR

Overview

TPS3831G18DQNR 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 1.67 V reset threshold, 150 nA typical supply current, push-pull RESET output, and operates from 0.9 V to 6.5 V supply voltage. It asserts active-low reset during brownout and supports manual reset via MR pin - used in glucose monitors and wearables requiring long battery life.

For engineers reviewing the TPS3831G18DQNR datasheet, TPS3831G18DQNR pinout, TPS3831G18DQNR application, or TPS3831G18DQNR equivalent, this page delivers verified electrical specs, thermal behavior across –40°C to +85°C, reset delay timing (200 ms typ), VDD transient rejection capability, and precise threshold accuracy (±1% at 25°C) critical for low-voltage microcontroller power sequencing.

Technical Context

The TPS3831G18DQNR implements a precision comparator-based supervision architecture with built-in hysteresis (17 mV typ) to prevent chatter near threshold. Its sampling scheme draws only ~15 µA for 200 µs per measurement cycle, enabling 150 nA average quiescent current while maintaining valid reset assertion down to VDD = 0.6 V.

It integrates an internal 20 kΩ pullup on the MR pin and supports bidirectional reset line interfacing via external series resistor. The device ignores fast transients - reset triggers only when VDD drops below 1.628 V (min) for ≥1.5 µs (at 10% overdrive), per Figure 13 in SBVS193D.

Key Specifications

Pinout & Package

X2SON-4 (DQN) package: 1.00 mm × 1.00 mm, 0.4 mm pitch, thermal pad on bottom for enhanced thermal dissipation and mechanical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3831G18DQNR, the TPS3831G18DBVR offers identical supervision performance in a larger, MR-less package, while MAX6371XR29+T trades precision and ultra-low power for broader availability and legacy compatibility - neither matches the combination of 1.67 V accuracy, 150 nA current, and MR support in the 1-mm² X2SON package.

Availability

TPS3831G18DQNR is available at Aetrix Electronics and suitable for portable medical devices, wearable electronics, and industrial IoT edge nodes requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for TPS3831G18DQNR 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 TPS383x product line was engineered specifically for ultralow-power voltage supervision in battery-constrained applications - emphasizing sub-200 nA operation, factory-trimmed thresholds, and robust transient immunity for medical, metering, and wearable systems.

FAQ

What is the minimum supply voltage at which TPS3831G18DQNR guarantees valid RESET output?

The TPS3831G18DQNR guarantees correct RESET logic state down to VDD = 0.6 V, as specified by the V(POR) parameter in Section 7.5 of SBVS193D. Below 0.6 V, the RESET output becomes undefined and must not be relied upon. This feature enables reliable brownout handling in energy-harvesting and deeply discharged battery scenarios where TPS3831G18DQNR remains functional longer than most comparators.

Does TPS3831G18DQNR require an external bypass capacitor, and why?

Yes, TI recommends a 0.1 µF ceramic capacitor placed close to the VDD pin of TPS3831G18DQNR. During its periodic voltage sampling, the device draws ~15 µA for ~200 µs - which can cause false resets if source impedance is high. The capacitor supplies this transient current, maintaining stable VDD and ensuring TPS3831G18DQNR operates reliably even with high-impedance supplies like thin PCB traces or resistive dividers.

How does the MR pin function on TPS3831G18DQNR, and what happens after it is released?

The MR pin on TPS3831G18DQNR is an active-low manual reset input with an internal 20 kΩ pullup to VDD. When pulled low, it forces RESET low immediately, independent of VDD level. After MR returns high, RESET remains low for the full reset delay time (td = 120–350 ms) only if VDD is above the 1.628 V threshold; otherwise, RESET stays asserted until VDD rises above threshold and td elapses. This behavior ensures deterministic restart timing in TPS3831G18DQNR-based systems.

What is the reset hysteresis of TPS3831G18DQNR, and why is it important?

The TPS3831G18DQNR has a typical hysteresis voltage (Vhys) of 17 mV, resulting in a total window of ~1.628 V to 1.645 V between falling and rising thresholds. This hysteresis prevents output oscillation during slow-rising supplies or noisy VDD conditions - critical for stable microcontroller boot sequences. Without it, marginal supply conditions could cause repeated reset assertion/deassertion, leading to failed initialization in TPS3831G18DQNR-supervised systems.

Can TPS3831G18DQNR drive a microcontroller's bidirectional reset pin directly?

No - TPS3831G18DQNR should not drive a bidirectional reset pin directly. Because some MCUs actively drive their reset pin both ways, connecting TPS3831G18DQNR's push-pull RESET output without isolation risks excessive current flow. TI recommends adding a series resistor (e.g., 100 Ω to 1 kΩ) between TPS3831G18DQNR's RESET and the MCU pin to limit current and prevent damage during contention. This protection is explicitly documented in Section 9.2.2.2 of SBVS193D.