Texas Instruments TPS3839G18DQNT

Overview

TPS3839G18DQNT from Texas Instruments is an ultralow-power voltage supervisor IC that monitors single-rail supply voltages and asserts an active-low RESET signal when VDD drops below 1.67 V (typical), with 150 nA typical supply current, 200 ms reset delay, and operation from 0.9 V to 6.5 V - used in battery-powered glucose monitors and wearables for reliable power-on reset and brownout detection.

For engineers reviewing the TPS3839G18DQNT datasheet, TPS3839G18DQNT pinout, TPS3839G18DQNT application, or TPS3839G18DQNT equivalent, key selection considerations include factory-trimmed 1.67 V threshold accuracy (±1%), push-pull RESET output drive capability, thermal stability across –40°C to +85°C, and compatibility with low-impedance bypass capacitor design for high-source-impedance supplies.

Technical Context

The TPS3839G18DQNT implements a precision bandgap-based voltage comparator with hysteresis (17 mV typical) to reject fast transients on VDD, ensuring robust reset assertion only during sustained undervoltage events. Its sampling architecture draws ~15 µA for ~200 µs per measurement cycle while maintaining 150 nA average quiescent current.

This device operates without manual reset (MR) functionality - unlike the TPS3831 family - and uses a fixed-threshold, single-supply monitoring architecture with push-pull output stage capable of sinking 2 mA at VDD ≥ 2.8 V. It is specified to assert valid RESET down to VDD = 0.6 V and remains functional across full industrial temperature range.

Key Specifications

Pinout & Package

TPS3839G18DQNT is housed in a 1.00 mm × 1.00 mm, 4-pin X2SON (DQN) package with exposed thermal pad. Pin 1 = VDD, Pin 2 = GND, Pin 3 = RESET, Pin 4 = NC (no internal connection).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3831G18DQNT, the TPS3839G18DQNT removes MR functionality to reduce cost and footprint while retaining identical threshold, accuracy, and ultra-low current - whereas MAX6371XR29+T serves a different voltage tier entirely and consumes 6× more current, limiting its use in multi-year battery applications.

Availability

TPS3839G18DQNT is available at Aetrix Electronics and suitable for glucose monitors, wearable health sensors, smart meter battery backup circuits, and industrial IoT edge nodes requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS3839G18DQNT 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, precision analog, and industrial-grade reliability.

The TPS383x product line was designed specifically for ultralow-power voltage supervision in battery-constrained and portable medical, metering, and wearable applications - prioritizing nanoamp quiescent current, factory-trimmed accuracy, and robust transient immunity.

FAQ

What is the factory-trimmed reset threshold voltage of the TPS3839G18DQNT?

The TPS3839G18DQNT has a factory-trimmed negative-going threshold voltage (VIT–) of 1.67 V, with ±1% accuracy over temperature. This value is confirmed in the Electrical Characteristics table of the SBVS193D datasheet and applies specifically to the TPS3839G18DQNT variant - not inferred from other TPS3839 thresholds. The hysteresis is 17 mV typical, yielding a positive-going release point of ~1.687 V.

Does the TPS3839G18DQNT support manual reset (MR) functionality?

No, the TPS3839G18DQNT does not include a manual reset (MR) input. That feature is exclusive to the TPS3831 family (e.g., TPS3831G18DQNT). The TPS3839G18DQNT is a 3-terminal supervisor (VDD, GND, RESET) with NC on Pin 4 - verified by the Pin Functions table and Device Options listing in the SBVS193D datasheet.

What is the minimum supply voltage at which the TPS3839G18DQNT guarantees valid RESET output logic?

The TPS3839G18DQNT guarantees valid RESET output down to VDD = 0.6 V, as specified by the V(POR) parameter in Section 7.5 of the SBVS193D datasheet. Below this voltage, the RESET output state is undefined and must not be relied upon for system safety or sequencing.

Can the TPS3839G18DQNT operate from a single alkaline cell?

Yes, the TPS3839G18DQNT supports operation from a single alkaline cell (0.9 V to 1.7 V nominal), as confirmed by Recommended Operating Conditions (VDD min = 0.9 V) and Typical Application Figure 15 in the SBVS193D datasheet. Its 1.67 V threshold aligns with the end-of-discharge voltage of standard alkaline cells, enabling precise low-battery detection.

What package type and dimensions does the TPS3839G18DQNT use?

The TPS3839G18DQNT uses the X2SON-4 (DQN) package: 1.00 mm × 1.00 mm footprint, 0.4 mm height, with an exposed thermal pad. This is explicitly listed in the Device Information table and Package Option Addendum of the SBVS193D datasheet - distinct from the SOT23-3 option offered for other TPS3839 variants.