Texas Instruments TPS3831K33DQNR

Overview

TPS3831K33DQNR 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 2.93 V reset threshold, 150 nA typical supply current, push-pull RESET output, and operates across 0.9 V to 6.5 V supply range - enabling reliable power-on reset and brownout detection in glucose monitors and wearables.

For engineers reviewing the TPS3831K33DQNR datasheet, TPS3831K33DQNR pinout, TPS3831K33DQNR application, or TPS3831K33DQNR equivalent, key selection criteria include its 200 ms reset delay, −40°C to +85°C operating range, manual reset (MR) input, 29 mV hysteresis, and compatibility with low-voltage microcontrollers requiring valid reset assertion down to 0.6 V VDD.

Technical Context

The TPS3831K33DQNR implements a precision comparator-based supervision architecture with internal hysteresis (29 mV) and a dedicated manual reset (MR) input that forces active-low RESET assertion independent of VDD level. Its sampling circuitry draws only ~15 µA for ~200 µs per measurement cycle, sustaining 150 nA average quiescent current.

It asserts RESET when VDD falls below 2.857 V (min) and holds it low for 120–350 ms after VDD rises above 2.974 V (max), ensuring stable processor initialization. The device rejects fast transients via amplitude/duration filtering and maintains valid logic states down to 0.6 V VDD - critical for end-of-battery-life operation.

Key Specifications

Pinout & Package

X2SON-4 (DQN) package: 1.00 mm × 1.00 mm, 0.5 mm pitch, thermal pad on bottom.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3831K33DQNR, TPS3831G33DQNR raises the reset point for tighter 3.3 V regulation compliance, while TPS3839K33DBZR removes MR to reduce size and cost - making TPS3831K33DQNR optimal when both precise 2.93 V supervision and manual reset are required in minimal area.

Availability

TPS3831K33DQNR is available at Aetrix Electronics and suitable for portable medical devices, battery-powered wearables, smart utility meters, and industrial handheld terminals requiring stable component supply across extended product lifecycles.

Supply support for TPS3831K33DQNR 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 solutions, with leadership in low-power design and precision analog ICs.

The TPS383x family was developed specifically for ultralow-power voltage supervision in battery-operated equipment - targeting applications where nanoscale current budgets and accurate brownout detection are essential.

FAQ

What is the exact reset threshold voltage of the TPS3831K33DQNR?

The TPS3831K33DQNR has a factory-trimmed negative-going threshold voltage (VIT–) of 2.93 V, with a guaranteed range of 2.857 V (min) to 2.974 V (max) over −40°C to +85°C. This value is specified in the Electrical Characteristics table of the SBVS193D datasheet and applies exclusively to the TPS3831K33DQNR variant - not other members of the TPS383x family.

Does the TPS3831K33DQNR support manual reset functionality?

Yes, the TPS3831K33DQNR includes a dedicated MR (manual reset) input pin. Pulling MR low (≤0.3×VDD) forces the RESET output active-low regardless of VDD level. After MR is released, RESET deasserts only after the 200 ms delay elapses - provided VDD remains above the 2.93 V threshold. This feature is absent in the TPS3839 variant.

What is the minimum supply voltage at which TPS3831K33DQNR guarantees valid RESET output logic?

The TPS3831K33DQNR guarantees valid RESET output logic down to 0.6 V VDD, as specified by the V(POR) parameter in the Electrical Characteristics table. Below 0.6 V, the RESET output state is undefined and must not be relied upon. This capability enables robust end-of-battery-life detection in single-cell alkaline and lithium systems.

Can the TPS3831K33DQNR operate from a 1.2 V supply?

Yes, the TPS3831K33DQNR operates across 0.9 V to 6.5 V, fully supporting 1.2 V supplies. At 1.2 V, its supply current remains 150 nA typical, RESET low-level output voltage (VOL) is ≤0.4 V at 1 µA load, and the 2.93 V threshold supervision remains functional - though the device will assert RESET continuously since VDD < VIT–. It is intended for monitoring higher rails (e.g., 3.3 V) while powered from a lower auxiliary supply.

What package type and dimensions does the TPS3831K33DQNR use?

The TPS3831K33DQNR uses the X2SON-4 (DQN) package: 1.00 mm × 1.00 mm body size, 0.5 mm pin pitch, and an exposed thermal pad on the bottom. This 4-pin, leadless package is optimized for space-constrained portable designs and requires reflow-compatible PCB layout with solder paste stencil apertures sized per TI's DQN packaging guidelines.