Texas Instruments TPS3831G18DQNT

Overview

TPS3831G18DQNT 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 across –40°C to +85°C. It asserts active-low reset when VDD falls below threshold and holds reset for 200 ms after recovery - used in glucose monitors and wearables requiring long battery life.

For engineers reviewing the TPS3831G18DQNT datasheet, TPS3831G18DQNT pinout, TPS3831G18DQNT application, or TPS3831G18DQNT equivalent, key selection criteria include its 1.67 V threshold accuracy (±1%), 0.9–6.5 V operating range, manual reset (MR) input, 200 ms reset delay, and X2SON-4 package compatibility with space-constrained portable designs.

Technical Context

The TPS3831G18DQNT implements a precision comparator-based supervision architecture with internal hysteresis (17 mV) to prevent chatter during supply recovery. Its MR input enables system-initiated resets independent of VDD level, with propagation delay under 46 ns.

It samples VDD at ultra-low duty cycle to achieve 150 nA typical quiescent current, drawing only ~15 µA for ~200 µs per sample - requiring a 0.1 µF local bypass capacitor on VDD to suppress false triggers from high-impedance sources.

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 TPS3831G18DBVR, the TPS3831G18DQNT offers MR capability and 60% smaller footprint but requires 4-pin layout; versus MAX6373XR22+T, it delivers 10× lower current and precise 1.67 V threshold essential for 1.8 V systems.

Availability

TPS3831G18DQNT is available at Aetrix Electronics and suitable for portable medical devices, wearable electronics, smart metering, and industrial IoT sensors requiring stable component supply over extended product lifecycles.

Supply support for TPS3831G18DQNT 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 family was developed specifically for ultralow-power supply monitoring in battery-constrained applications - emphasizing sub-µA operation, factory-trimmed thresholds, and robust transient immunity for medical, metering, and portable systems.

FAQ

What is the factory-trimmed reset threshold voltage of the TPS3831G18DQNT?

The TPS3831G18DQNT has a factory-trimmed negative-going threshold voltage (VIT–) of 1.67 V, with ±1% accuracy at 25°C and guaranteed operation across –40°C to +85°C. This value is laser-trimmed during production and does not require external calibration - enabling direct use in 1.8 V rail supervision without resistor dividers.

Does the TPS3831G18DQNT support manual reset functionality?

Yes, the TPS3831G18DQNT includes a dedicated MR (manual reset) input pin that allows external logic or a pushbutton to force the RESET output low regardless of VDD level. When MR is pulled low (≤0.3×VDD), RESET asserts immediately; deassertion occurs only after MR returns high and the 200 ms reset delay expires - a feature absent in the pin-compatible TPS3839 variant.

What package type and dimensions does the TPS3831G18DQNT use?

The TPS3831G18DQNT uses the X2SON-4 (DQN) package: a 1.00 mm × 1.00 mm body with 0.4 mm pitch and an exposed thermal pad on the bottom. It has four terminals - VDD, GND, RESET, and MR - and is RoHS-compliant with NiPdAu lead finish and Level-1 moisture sensitivity rating.

What is the minimum supply voltage required for valid RESET output operation in the TPS3831G18DQNT?

The TPS3831G18DQNT guarantees valid RESET output logic state down to VDD = 0.6 V, as specified by the V(POR) parameter. Below this voltage, the RESET output becomes undefined - so system designers must ensure critical operations complete before VDD falls below 0.6 V, especially in deep-discharge battery scenarios.

How does the TPS3831G18DQNT achieve 150 nA typical supply current?

The TPS3831G18DQNT achieves 150 nA typical supply current through a duty-cycled sampling architecture: it draws ~15 µA for ~200 µs every ~100 ms to measure VDD, resulting in ultra-low average current. This requires a 0.1 µF ceramic capacitor at the VDD pin to prevent false resets caused by voltage droop during sampling - a design requirement explicitly called out in the datasheet.