Texas Instruments TPS3839G12DBZR

Overview

TPS3839G12DBZR from Texas Instruments is an ultralow-power voltage supervisor IC designed for supply monitoring in battery-critical systems. It features a factory-trimmed 1.1 V reset threshold, 150 nA typical supply current at 25°C, push-pull RESET output, valid operation down to 0.6 V VDD, and operates across –40°C to +85°C. It is used in glucose monitors and wearables where long battery life and reliable power-on reset are essential.

For engineers reviewing the TPS3839G12DBZR datasheet, TPS3839G12DBZR pinout, TPS3839G12DBZR application, or TPS3839G12DBZR equivalent, key selection criteria include threshold accuracy (±1% at 25°C), transient rejection capability, reset delay stability over temperature (120–350 ms), and compatibility with sub-1.2 V supply rails in single-cell alkaline or Li-ion systems.

Technical Context

The TPS3839G12DBZR implements a precision bandgap-based voltage reference and comparator with hysteresis (11 mV typical) to detect VDD drops below its 1.1 V negative-going threshold (VIT–). Its sampling architecture draws only ~15 µA for ~200 µs per measurement cycle, enabling 150 nA average quiescent current.

It lacks a manual reset (MR) input-unlike the TPS3831 family-and uses a 3-pin SOT-23 (DBZ) package with VDD, GND, and active-low RESET terminals. The push-pull output drives microcontroller reset pins directly without external pull-up resistors and remains asserted for 200 ms (typical) after VDD recovers above VIT– + Vhys.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package: 2.92 mm × 2.37 mm footprint, surface-mount, lead-free, RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3839G12DBZR, TPS3831G12DQNR adds manual reset capability at the cost of larger footprint and extra routing, while MAX6371XR29+T trades precision and ultra-low IQ for broader second-source availability and mature qualification history.

Availability

TPS3839G12DBZR is available at Aetrix Electronics and suitable for glucose monitors, wearable fitness trackers, smart meter battery backup, and portable ECG patch devices requiring stable component supply across extended product lifecycles.

Supply support for TPS3839G12DBZR 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 signal chain and power management technologies.

The TPS383x family was designed specifically for ultralow-power voltage supervision in battery-operated medical, industrial, and portable electronics - prioritizing nanoscale current consumption and sub-1.2 V operational robustness.

FAQ

What is the exact reset threshold voltage of the TPS3839G12DBZR?

The TPS3839G12DBZR has a factory-trimmed negative-going threshold voltage (VIT–) of 1.1 V, with ±1% accuracy at 25°C. Over the full –40°C to +85°C range, the threshold drift is less than ±0.5% relative to nominal, as confirmed in the Electrical Characteristics table of the SBVS193D datasheet. This value is laser-trimmed during production and does not require external calibration.

Does the TPS3839G12DBZR support manual reset functionality?

No, the TPS3839G12DBZR does not include a manual reset (MR) input. Unlike the TPS3831 series, the TPS3839 family omits the MR pin to enable the compact 3-pin SOT-23 (DBZ) package. Reset is triggered solely by VDD falling below the 1.1 V threshold. For designs requiring MR, the pin-compatible TPS3831G12DQNR (X2SON-4) is the recommended alternative.

What is the minimum supply voltage at which the TPS3839G12DBZR guarantees valid RESET output?

The TPS3839G12DBZR guarantees a valid active-low RESET output 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 state is undefined and must not be relied upon. This feature ensures deterministic behavior during deep brownout conditions common in aging alkaline or lithium button cells.

How does the TPS3839G12DBZR achieve 150 nA typical supply current?

The TPS3839G12DBZR achieves 150 nA typical supply current through a duty-cycled sampling architecture: it draws ~15 µA for ~200 µs every ~100 ms to measure VDD, resulting in an average current of 150 nA. This method avoids continuous biasing of the reference and comparator, making it ideal for multi-year battery operation in wearables and medical patches where the TPS3839G12DBZR is commonly deployed.

Is the TPS3839G12DBZR compatible with 3.3 V microcontroller reset inputs?

Yes, the TPS3839G12DBZR is fully compatible with 3.3 V microcontrollers. Its push-pull RESET output delivers VOH ≥ (VDD – 0.4 V) and VOL ≤ 0.4 V across the full 0.9–6.5 V VDD range. At VDD = 3.3 V, VOH exceeds 2.9 V - well above the VIH threshold of standard 3.3 V CMOS inputs - and VOL remains ≤ 0.4 V, ensuring solid logic-low assertion even under worst-case load conditions.