Texas Instruments TPS3839G18DBZT

Overview

TPS3839G18DBZT 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 glucose monitors and wearables.

For engineers reviewing the TPS3839G18DBZT datasheet, TPS3839G18DBZT pinout, TPS3839G18DBZT application, or TPS3839G18DBZT equivalent, key selection criteria include its 1.67 V threshold accuracy (±1% at 25°C), 200 ms reset delay, SOT-23-3 package compatibility, and ability to assert RESET under fast transients while consuming <500 nA across –40°C to 85°C.

Technical Context

The TPS3839G18DBZT implements a precision comparator with hysteresis (17 mV typical) to detect VDD drops below 1.67 V and maintain RESET assertion until VDD exceeds 1.687 V. Its sampling-based architecture draws only ~15 µA for 200 µs during each measurement cycle, achieving 150 nA average quiescent current.

No manual reset (MR) input is present - this is a 3-pin variant optimized for space-constrained applications where external reset initiation is unnecessary. The push-pull output drives microcontroller reset pins directly without pull-up resistors and remains functional down to 0.6 V VDD.

Key Specifications

Pinout & Package

SOT-23-3 package (2.92 mm × 2.37 mm), surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3839G18DBZT, the DCKR variant offers superior thermal dissipation and footprint scalability but requires layout revision, while the MAX6371 provides different threshold and higher current - making it unsuitable for direct substitution in 1.8 V rail supervision.

Availability

TPS3839G18DBZT is available at Aetrix Electronics and suitable for portable medical devices, wearable electronics, smart meter backup systems, and industrial IoT edge sensors requiring stable component supply with long-term lifecycle assurance.

Supply support for TPS3839G18DBZT 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 ICs.

The TPS383x product line was developed specifically for ultralow-power voltage supervision in battery-operated medical, industrial, and consumer devices - prioritizing sub-µA current, wide VDD range, and guaranteed operation below 1 V.

FAQ

What is the exact reset threshold voltage of the TPS3839G18DBZT?

The TPS3839G18DBZT has a factory-trimmed negative-going threshold voltage (VIT–) of 1.67 V, with ±1% accuracy at 25°C and ±1.5% over –40°C to 85°C. This value is confirmed in the Electrical Characteristics table of the SBVS193D datasheet and applies specifically to the G18 variant in DBZ packaging.

Does the TPS3839G18DBZT support manual reset functionality?

No, the TPS3839G18DBZT does not include a manual reset (MR) input. It is a 3-pin SOT-23 variant with VDD, GND, and RESET terminals only. Manual reset capability is exclusive to the TPS3831 family (e.g., TPS3831G18DQNR) and select 4-pin X2SON variants of the TPS3839.

What is the minimum supply voltage at which the TPS3839G18DBZT guarantees valid RESET output logic?

The TPS3839G18DBZT guarantees valid RESET output logic down to 0.6 V VDD, as specified by the V(POR) parameter in Section 7.5 of the datasheet. Below this voltage, the RESET output state is undefined and must not be relied upon for system control.

Can the TPS3839G18DBZT drive a microcontroller reset pin directly without external components?

Yes, the TPS3839G18DBZT features a push-pull RESET output capable of sinking ≥120 µA at 0.9 V and ≥2 mA at 6.5 V. This allows direct connection to standard CMOS reset inputs without external pull-up resistors, reducing BOM count and leakage paths in ultra-low-power designs.

How does the TPS3839G18DBZT handle fast voltage transients on the VDD line?

The TPS3839G18DBZT rejects transients shorter than 20 µs and smaller than 17 mV in amplitude relative to its 1.67 V threshold, per Figure 13 in the SBVS193D datasheet. Its internal sampling architecture prevents false resets caused by switching noise or load-dump events common in DC/DC converter outputs.