Texas Instruments TPS3831K50DQNR

Overview

TPS3831K50DQNR from Texas Instruments is an ultralow-power voltage supervisor IC designed to monitor single-rail supply voltages in battery-critical systems. It features a factory-trimmed 4.38 V reset threshold, 150 nA typical supply current at 25°C, push-pull RESET output, and valid operation down to 0.6 V VDD - enabling reliable power-on reset in glucose monitors and wearables.

For engineers reviewing the TPS3831K50DQNR datasheet, TPS3831K50DQNR pinout, TPS3831K50DQNR application, or TPS3831K50DQNR equivalent, key selection criteria include its 4.38 V threshold accuracy (±1% at 25°C), 200 ms reset delay, −40°C to +85°C operating range, X2SON-4 package compatibility, and MR input support for manual reset assertion.

Technical Context

The TPS3831K50DQNR implements a precision comparator-based supervision architecture with built-in hysteresis (44 mV typical) to prevent chatter during supply recovery. Its sampling-based sensing scheme draws only ~15 µA for 200 µs per measurement cycle, sustaining average current at 150 nA while maintaining threshold detection integrity across 0.9–6.5 V input range.

Unlike the TPS3839 variant, the TPS3831K50DQNR includes a dedicated manual reset (MR) input that accepts logic-level signals (VIH = 0.7×VDD, VIL = 0.3×VDD) and features an internal 20 kΩ pullup resistor - enabling direct connection to microcontroller GPIO without external biasing.

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 TPS3831K50DQNR, the TPS3831K50DBVR removes MR capability but offers easier hand-soldering and lower cost, while the MAX6375XR37+T trades precision and ultra-low power for legacy footprint compatibility - neither matches the combination of 4.38 V threshold, MR input, and 150 nA operation in a 1-mm² package.

Availability

TPS3831K50DQNR is available at Aetrix Electronics and suitable for portable medical devices, industrial handheld meters, smart wearables, and low-power IoT sensors requiring stable component supply throughout product lifecycles.

Supply support for TPS3831K50DQNR 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 signal chains.

The TPS383x family was developed specifically for ultralow-power voltage monitoring in battery-constrained applications such as glucose monitors, wearables, and portable instrumentation - prioritizing sub-µA quiescent current and factory-trimmed thresholds.

FAQ

What is the exact reset threshold voltage of the TPS3831K50DQNR?

The TPS3831K50DQNR has a factory-trimmed negative-going threshold voltage (VIT–) of 4.38 V, with ±1% accuracy at 25°C and 44 mV typical hysteresis. This value is confirmed in the Electrical Characteristics table of the SBVS193D datasheet and applies specifically to the K50 variant in the DQN package.

Does the TPS3831K50DQNR support manual reset functionality?

Yes, the TPS3831K50DQNR includes a dedicated MR (manual reset) input pin that asserts the active-low RESET output when pulled low. The MR pin features an internal 20 kΩ pullup resistor to VDD, allowing it to be left floating if not used - a feature absent in the TPS3839 variant.

What package type is used for the TPS3831K50DQNR?

The TPS3831K50DQNR uses the X2SON-4 (DQN) package: a 1.00 mm × 1.00 mm, 0.4 mm pitch, 4-pin leadless package with an exposed thermal pad. This compact footprint is optimized for space-constrained wearable and portable medical designs.

Can the TPS3831K50DQNR operate with supply voltages below 1.0 V?

Yes, the TPS3831K50DQNR is specified to assert a valid RESET output down to VDD = 0.6 V, and operates across 0.9 V to 6.5 V. This enables reliable power-on reset behavior during deep battery discharge in single-cell alkaline or Li-ion systems.

What is the typical supply current consumption of the TPS3831K50DQNR?

The TPS3831K50DQNR consumes 150 nA typical supply current at 25°C, with a maximum of 500 nA over the full −40°C to +85°C temperature range. This ultralow quiescent current is measured with RESET output unconnected and is critical for multi-year battery operation.