Texas Instruments TPS3839G25DBZT

Overview

TPS3839G25DBZT 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 2.325 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 sub-1.8 V alkaline or Li-ion single-cell applications.

For engineers reviewing the TPS3839G25DBZT datasheet, TPS3839G25DBZT pinout, TPS3839G25DBZT application, or TPS3839G25DBZT equivalent, key selection considerations include its 2.325 V threshold accuracy (±1% at 25°C), 200 ms reset delay, SOT-23-3 package compatibility, and immunity to fast VDD transients - critical for portable medical devices, wearables, and metering where quiescent current and voltage margin are design constraints.

Technical Context

The TPS3839G25DBZT implements a precision bandgap-based voltage comparator with hysteresis (23 mV) to reject noise and transient-induced false resets. Its sampling architecture draws only ~15 µA for 200 µs during each measurement cycle, sustaining average current at 150 nA - making it suitable for multi-year battery life in always-on sensing nodes.

No manual reset (MR) input is present; this is a dedicated 3-pin supervisory device with VDD, GND, and active-low RESET terminals. The push-pull output drives microcontroller reset pins directly without external pull-up, supporting logic-level compatibility across 0.9–6.5 V supply range.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package: 2.92 mm × 2.37 mm footprint, 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 TPS3839G25DBZT, the TPS3839G33DBZT shifts threshold upward for 3.3 V systems but retains identical low-power and noise-immunity advantages, whereas MAX6375XR23+T trades 8× higher current and unverified transient rejection for broader distributor availability - making TPS3839G25DBZT optimal for long-life, noise-prone, 2.5 V-class designs.

Availability

TPS3839G25DBZT is available at Aetrix Electronics and suitable for portable medical devices, industrial metering, and wearable electronics requiring stable component supply with guaranteed long-term manufacturability and consistent parametric performance.

Supply support for TPS3839G25DBZT 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 specializing in analog and embedded processing technologies, with leadership in low-power design and precision analog signal chains.

The TPS383x product line was developed specifically for ultralow-power voltage supervision in battery-operated and energy-harvesting systems, emphasizing sub-200 nA operation, wide supply range, and robust transient immunity.

FAQ

What is the exact reset threshold voltage of the TPS3839G25DBZT?

The TPS3839G25DBZT has a factory-trimmed negative-going threshold voltage (VIT–) of 2.325 V, with ±1% accuracy at 25°C and ±1.5% over the full –40°C to +85°C temperature range. This value is specified in the Electrical Characteristics table of the SBVS193D datasheet and applies exclusively to the TPS3839G25DBZT variant in SOT-23-3 packaging.

Does the TPS3839G25DBZT support manual reset functionality?

No, the TPS3839G25DBZT does not include a manual reset (MR) input. It is a 3-pin device (VDD, GND, RESET) with no MR pin - unlike the 4-pin TPS3831 variants. Manual reset capability is exclusive to the TPS3831 family; the TPS3839G25DBZT relies solely on VDD monitoring for reset assertion.

What is the minimum supply voltage required for valid RESET assertion in the TPS3839G25DBZT?

The TPS3839G25DBZT asserts a valid, defined RESET signal down to 0.6 V VDD, as specified by the V(POR) parameter in the datasheet. Below 0.6 V, the RESET output state is undefined and must not be relied upon for system control - this ensures deterministic behavior during deep battery discharge in applications like glucose monitors.

Can the TPS3839G25DBZT drive a microcontroller's bidirectional reset pin directly?

Yes, the TPS3839G25DBZT's push-pull RESET output can drive most microcontroller bidirectional reset pins directly. However, TI recommends adding a 100 Ω series resistor between RESET and the MCU pin to limit current if both devices attempt to drive the line simultaneously - preventing latch-up or excessive I/O stress during power transitions.

How does the TPS3839G25DBZT handle fast voltage transients on the VDD line?

The TPS3839G25DBZT rejects transients shorter than ~20 µs or smaller than ~2.267 V amplitude (i.e., <23 mV below threshold), per Figure 13 in SBVS193D. This built-in immunity prevents false resets caused by switching noise, ESD coupling, or inductive kickback - eliminating need for external RC filtering in most portable designs.