Texas Instruments TPS3831L30DQNT

Overview

TPS3831L30DQNT 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 2.63 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 TPS3831L30DQNT datasheet, TPS3831L30DQNT pinout, TPS3831L30DQNT application, or TPS3831L30DQNT equivalent, key selection criteria include its 2.63 V threshold accuracy (±1% at 25°C), 200 ms reset delay, −40°C to +85°C operating range, and X2SON-4 package compatibility with space-constrained portable designs.

Technical Context

The TPS3831L30DQNT implements a precision comparator-based supervision architecture with built-in hysteresis (26 mV typical) to prevent chatter during supply recovery. Its sampling circuitry draws only ~15 µA for ~200 µs per measurement cycle, sustaining average quiescent current at 150 nA while rejecting transients ≥26 mV amplitude lasting >10 µs.

Unlike the TPS3839 variant, the TPS3831L30DQNT includes a manual reset (MR) input that accepts logic-level signals (VIH = 0.7×VDD, VIL = 0.3×VDD) and features an internal 20 kΩ pullup to VDD - enabling direct connection to open-drain controllers 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 for enhanced thermal dissipation and mechanical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3839L30DQNR, the TPS3831L30DQNT adds MR functionality in the same X2SON-4 footprint; versus MAX6373KSA+T, it delivers 8× lower supply current and 75% smaller area - making it optimal for next-gen compact, long-life portable electronics.

Availability

TPS3831L30DQNT is available at Aetrix Electronics and suitable for glucose monitors, wearable health trackers, and industrial handheld meters requiring stable component supply with guaranteed long-term availability.

Supply support for TPS3831L30DQNT 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 developed specifically for ultralow-power voltage supervision in battery-operated medical, metering, and portable consumer devices - prioritizing sub-µA quiescent current and factory-trimmed accuracy over speed or feature count.

FAQ

What is the exact reset threshold voltage of the TPS3831L30DQNT?

The TPS3831L30DQNT has a factory-trimmed negative-going threshold voltage (VIT–) of 2.63 V, with ±1% accuracy at 25°C and ±1.5% over the full −40°C to +85°C temperature range. This value is confirmed in the Electrical Characteristics table of the SBVS193D datasheet and applies specifically to the L30 variant, not other members of the TPS383x family.

Does the TPS3831L30DQNT require an external capacitor on the VDD pin?

Yes - TI recommends a 0.1 µF ceramic bypass capacitor placed as close as possible to the VDD pin of the TPS3831L30DQNT. This mitigates voltage droop caused by the device's periodic 15 µA sampling current, especially when sourced from high-impedance supplies like resistive dividers or long PCB traces, preventing false resets.

Can the MR pin of the TPS3831L30DQNT be left unconnected?

Yes - the MR pin of the TPS3831L30DQNT has an internal 20 kΩ pullup resistor to VDD, so it may be left floating if manual reset functionality is not required. In that case, RESET assertion depends solely on VDD crossing the 2.63 V threshold, and the device operates identically to the MR-less TPS3839L30DQNR variant.

What is the minimum VDD voltage at which the TPS3831L30DQNT guarantees valid RESET output logic?

The TPS3831L30DQNT guarantees valid RESET output logic down to VDD = 0.6 V, as specified by the V(POR) parameter in Section 7.5 of the datasheet. Below 0.6 V, the RESET output state is undefined and must not be relied upon for system safety or sequencing.

Is the TPS3831L30DQNT compatible with bidirectional microcontroller reset pins?

Yes - the TPS3831L30DQNT's push-pull RESET output can drive bidirectional MCU reset pins, but TI recommends placing a series resistor (e.g., 100 Ω) between RESET and the MCU pin to limit current if both devices attempt to drive the line simultaneously during startup or fault conditions, as detailed in Figure 16 of the SBVS193D datasheet.