Texas Instruments TPS3831K50DQNT

Overview

TPS3831K50DQNT from Texas Instruments is an ultralow-power voltage supervisor IC designed for supply monitoring 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 operates across 0.9 V to 6.5 V supply range - enabling reliable power-on reset in glucose monitors and wearables.

For engineers reviewing the TPS3831K50DQNT datasheet, TPS3831K50DQNT pinout, TPS3831K50DQNT application, or TPS3831K50DQNT equivalent, key selection criteria include its 4.38 V threshold accuracy (±1% at 25°C), 200 ms reset delay, −40°C to +85°C temperature range, and X2SON-4 package compatibility with space-constrained portable designs.

Technical Context

The TPS3831K50DQNT implements a precision comparator-based supervision architecture with built-in hysteresis (44 mV) to prevent chatter during supply recovery. Its internal sampling circuit draws only ~15 µA for ~200 µs per cycle, sustaining average quiescent current at 150 nA while maintaining valid RESET assertion down to VDD = 0.6 V.

Unlike the TPS3839 variant, the TPS3831K50DQNT 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 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. Compact footprint ideal for wearables and medical patches.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3839K50DBVR and MAX6375XR37+T, the TPS3831K50DQNT uniquely combines ultralow 150 nA current, 4.38 V precision threshold, MR functionality, and 1.0 mm² X2SON packaging - making it optimal for next-generation wearable and medical sensors requiring both longevity and controllability.

Availability

TPS3831K50DQNT is available at Aetrix Electronics and suitable for glucose monitors, portable ECG devices, and smart wearables requiring stable component supply with long-term lifecycle assurance.

Supply support for TPS3831K50DQNT 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 voltage supervision in battery-operated medical, metering, and portable electronics - prioritizing sub-µA quiescent current and validated operation down to 0.6 V.

FAQ

What is the exact reset threshold voltage of the TPS3831K50DQNT?

The TPS3831K50DQNT has a factory-trimmed negative-going threshold voltage (VIT–) of 4.38 V, with ±1% accuracy at 25°C and ±1.5% over the full −40°C to +85°C operating range. This value is confirmed in the Electrical Characteristics table of the SBVS193D datasheet and applies specifically to the K50 variant in DQN packaging.

Does the TPS3831K50DQNT support manual reset functionality?

Yes, the TPS3831K50DQNT includes a dedicated MR (manual reset) input pin. Pulling MR low forces the RESET output active regardless of VDD level. The pin features an internal 20 kΩ pullup resistor, allowing it to be left floating when unused - a feature absent in the pin-compatible TPS3839K50DBVR variant.

What is the minimum supply voltage at which TPS3831K50DQNT guarantees valid RESET output?

The TPS3831K50DQNT guarantees valid RESET output down to VDD = 0.6 V, as specified by the V(POR) parameter in Section 7.5 of the datasheet. Below this voltage, RESET behavior is undefined and must not be relied upon for system safety or initialization.

Can the TPS3831K50DQNT operate from a single alkaline cell?

Yes, the TPS3831K50DQNT operates across 0.9 V to 6.5 V, fully supporting single alkaline cells (nominal 1.5 V, discharge range ~0.9–1.6 V). Its 4.38 V threshold is intended for higher-voltage rails; for alkaline monitoring, variants like TPS3831A09DQNT (0.9 V threshold) are more appropriate.

What package type and dimensions does the TPS3831K50DQNT use?

The TPS3831K50DQNT uses the X2SON-4 (DQN) package: 1.00 mm × 1.00 mm body size, 0.4 mm pin pitch, and an exposed thermal pad on the bottom. This package is documented in TI's Mechanical, Packaging, and Orderable Information section and confirmed in the Device Information table of SBVS193D.