Texas Instruments TPS3839G18DQNR

Overview

TPS3839G18DQNR 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 at 25°C, push-pull RESET output, and valid operation down to 0.6 V VDD - enabling reliable power-on reset in coin-cell and single-alkaline applications.

For engineers reviewing the TPS3839G18DQNR datasheet, TPS3839G18DQNR pinout, TPS3839G18DQNR application, or TPS3839G18DQNR equivalent, key selection considerations include its 1.67 V threshold accuracy (±1% at 25°C), 200 ms reset delay, −40°C to +85°C operating range, SOT-23-3 package compatibility, and transient rejection capability against fast VDD dips.

Technical Context

The TPS3839G18DQNR implements a precision bandgap-based voltage comparator with hysteresis (17 mV typical) to detect VDD falling below 1.67 V and hold RESET low until VDD rises above 1.687 V. Its sampling architecture draws only ~15 µA for ~200 µs per measurement cycle, sustaining average IDD of 150 nA.

Unlike the TPS3831 variant, the TPS3839G18DQNR omits the manual reset (MR) input and uses a 3-pin SOT-23 (DBZ) package - simplifying layout while retaining full reset timing control, VDD transient immunity, and operation across 0.9 V–6.5 V supply range.

Key Specifications

Pinout & Package

TPS3839G18DQNR is housed in a 3-pin SOT-23 (DBZ) package measuring 2.92 mm × 2.37 mm, optimized for space-constrained portable designs. The package includes no thermal pad and requires standard reflow profiles (MSL Level-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3839G18DQNR, TPS3831G18DQNR adds manual reset capability at the cost of larger footprint and extra routing, while MAX6371XR29+T trades ultralow power for less stringent threshold matching and no transient rejection - making TPS3839G18DQNR optimal for long-life, noise-prone, 1.8 V rail supervision.

Availability

TPS3839G18DQNR is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, wearable fitness trackers, industrial IoT edge nodes, and battery-backed memory systems requiring stable component supply across extended product lifecycles.

Supply support for TPS3839G18DQNR 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 engineered specifically for ultralow-power voltage supervision in battery-constrained applications - prioritizing nanoamp quiescent current, wide input voltage range, and robust transient immunity over feature count.

FAQ

What is the exact reset threshold voltage of the TPS3839G18DQNR?

The TPS3839G18DQNR has a factory-trimmed negative-going threshold voltage (VIT−) of 1.67 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 G18 variant across all SOT-23-3 packaged units.

Does the TPS3839G18DQNR support manual reset functionality?

No, the TPS3839G18DQNR does not include a manual reset (MR) input. That function is exclusive to the TPS3831 series (e.g., TPS3831G18DQNR). The TPS3839G18DQNR is a 3-pin device (VDD, GND, RESET) with no MR pin - simplifying design but removing user-initiated reset capability.

What is the minimum supply voltage at which TPS3839G18DQNR guarantees valid RESET output behavior?

The TPS3839G18DQNR guarantees valid RESET output logic state down to 0.6 V VDD, as specified by the V(POR) parameter in Section 7.5 of the datasheet. Below 0.6 V, the RESET output becomes undefined and must not be relied upon for system safety or data integrity.

Can the TPS3839G18DQNR drive a microcontroller's bidirectional reset pin directly?

Yes, but a series current-limiting resistor (typically 100 Ω to 1 kΩ) is required between the TPS3839G18DQNR RESET pin and the MCU's bidirectional reset pin. This prevents excessive current flow when both devices attempt to drive the line simultaneously - a requirement explicitly called out in Section 9.2.2.2 of the SBVS193D datasheet.

What package type and dimensions does the TPS3839G18DQNR use?

The TPS3839G18DQNR uses the SOT-23-3 (DBZ) package, measuring 2.92 mm × 2.37 mm with 0.95 mm height. It is distinct from the X2SON-4 (DQN) variants used by the TPS3831 series and carries the orderable part marking "G18" on the top surface per TI's packaging addendum.