Texas Instruments TPS3839G12DBZT

Overview

TPS3839G12DBZT 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 1.1 V (factory-trimmed threshold), 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 TPS3839G12DBZT datasheet, TPS3839G12DBZT pinout, TPS3839G12DBZT application, or TPS3839G12DBZT equivalent, key selection considerations include its 1.1 V threshold accuracy (±1%), push-pull RESET output, SOT-23-3 package compatibility, and ability to maintain valid logic state down to 0.6 V VDD.

Technical Context

The TPS3839G12DBZT implements a precision comparator-based supervision architecture with built-in hysteresis (11 mV typical) to prevent chatter during threshold crossings. It samples VDD intermittently to achieve ultralow quiescent current, requiring only a 0.1 µF bypass capacitor for stable operation with high-impedance sources.

No manual reset (MR) input is present - this is a 3-pin variant (VDD, GND, RESET) distinct from the 4-pin TPS3831 family. The push-pull RESET driver supports direct interface to microcontroller reset pins without external pull-up resistors and remains asserted until VDD exceeds VIT– + Vhys and the 200 ms delay elapses.

Key Specifications

Pinout & Package

SOT-23-3 package (2.92 mm × 2.37 mm), surface-mount, lead-free, RoHS-compliant, with thermal pad not connected internally.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3839G12DBZT, the TPS3831G12DQNR adds manual reset functionality at the cost of extra pin and package size, while the MAX6371XR29+T trades 10× higher supply current and looser accuracy for second-source availability - making TPS3839G12DBZT optimal for new ultra-low-power designs where threshold precision and nanocurrent operation are critical.

Availability

TPS3839G12DBZT is available at Aetrix Electronics and suitable for portable medical devices, wearable electronics, and industrial backup systems requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS3839G12DBZT 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 developed specifically for battery-constrained applications demanding sub-microamp supervision - targeting glucose meters, wearables, smart meters, and energy-harvesting IoT nodes where every nanoamp impacts functional lifetime.

FAQ

What is the exact reset threshold voltage of the TPS3839G12DBZT?

The TPS3839G12DBZT has a factory-trimmed negative-going threshold voltage (VIT–) of 1.1 V with ±1% accuracy over temperature (−40°C to +85°C), as specified in the Electrical Characteristics table of the SBVS193D datasheet. This value is laser-trimmed during production and does not require external calibration.

Does the TPS3839G12DBZT support manual reset functionality?

No, the TPS3839G12DBZT does not include a manual reset (MR) input. It is a 3-pin SOT-23 device (VDD, GND, RESET) with no MR pin - unlike the 4-pin TPS3831 variants. Reset assertion is solely voltage-triggered based on VDD crossing the 1.1 V threshold.

Can the TPS3839G12DBZT operate reliably at 0.9 V supply voltage?

Yes, the TPS3839G12DBZT is fully specified to operate at VDD = 0.9 V, with guaranteed 150 nA supply current, valid RESET output state, and correct threshold detection. Its minimum operating voltage is 0.9 V, and it maintains defined logic behavior down to 0.6 V VDD.

What is the reset delay time of the TPS3839G12DBZT and how is it determined?

The TPS3839G12DBZT provides a typical reset delay (td) of 200 ms after VDD rises above the threshold voltage plus hysteresis. This delay is internally fixed and unadjustable, with min/max values of 120 ms and 350 ms across temperature and process variation, ensuring consistent power-up timing without external components.

Is a bypass capacitor required for stable operation of the TPS3839G12DBZT?

Yes, TI recommends a 0.1 µF ceramic bypass capacitor placed as close as possible to the VDD pin. This mitigates voltage droop caused by the device's periodic 15 µA sampling current, especially when sourced from high-impedance supplies like RC filters or energy harvesters - preventing false resets.