Texas Instruments TPS3128E12DBVTG4

Overview

TPS3128E12DBVTG4 from Texas Instruments is an ultra-low-voltage processor supervisory IC with 1.14 V nominal reset threshold, watchdog timer, manual reset input, and open-drain active-low RESET output in a 5-pin SOT-23 package. It monitors supply rails down to 0.9 V, provides 180 ms power-on reset delay, draws only 14 µA typical supply current, and operates across –40°C to +85°C - used for reliable system initialization in battery-powered DSP and microcontroller applications.

For engineers reviewing the TPS3128E12DBVTG4 datasheet, TPS3128E12DBVTG4 pinout, TPS3128E12DBVTG4 application, or TPS3128E12DBVTG4 equivalent, key selection criteria include its 1.14 V threshold accuracy, integrated watchdog timeout (1.4 s typ), MR-triggered reset capability, open-drain output topology, and compatibility with low-voltage digital systems requiring fail-safe power sequencing and software hang detection.

Technical Context

The TPS3128E12DBVTG4 implements a fixed-threshold voltage supervisor with internal hysteresis (20 mV) and a retriggerable watchdog timer that responds to rising or falling edges on WDI. Its reset assertion is triggered when VDD falls below 1.14 V (VIT−), and the RESET output remains asserted for 180 ms after VDD rises above VIT+ = VIT− + VHYS.

This device integrates three critical supervision functions: supply voltage monitoring, manual reset override via MR pin, and watchdog timeout detection - all within a single 5-pin SOT-23 footprint. The open-drain RESET output supports wired-OR configurations and level-shifting, while the 14 µA quiescent current enables use in always-on, energy-constrained systems.

Key Specifications

Pinout & Package

TPS3128E12DBVTG4 is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for space-constrained PCB layouts in portable electronics and embedded modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3128E12DBVTG4, TPS3123E12DBVR offers stronger drive but sacrifices bus-sharing flexibility, while TPS3808G12DBVR trades supervision intelligence for higher threshold accuracy and delay configurability - making TPS3128E12DBVTG4 optimal for compact, intelligent reset management in resource-constrained systems.

Availability

TPS3128E12DBVTG4 is available at Aetrix Electronics and suitable for portable electronics, wireless infrastructure, and industrial automation applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for TPS3128E12DBVTG4 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 leader delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.

The TPS312x family was designed specifically for low-voltage DSP and microcontroller systems needing integrated voltage supervision, watchdog monitoring, and manual reset - targeting battery-powered and always-on embedded applications.

FAQ

What is the exact reset threshold voltage of the TPS3128E12DBVTG4?

The TPS3128E12DBVTG4 has a nominal reset threshold voltage (VIT−) of 1.14 V, with a guaranteed range of 1.10 V to 1.18 V across –40°C to +85°C. This value is factory-trimmed and applies specifically to the E12 variant, enabling accurate supervision of 1.2 V supply rails without external calibration components.

Does the TPS3128E12DBVTG4 support watchdog timer functionality?

Yes, the TPS3128E12DBVTG4 includes a retriggerable watchdog timer with a typical timeout of 1.4 s. It monitors edge transitions (rising or falling) on the WDI pin; failure to receive a transition within the timeout period causes the RESET output to assert for 180 ms, then automatically clears - a key feature distinguishing it from basic reset supervisors.

What is the function of the MR pin on the TPS3128E12DBVTG4?

The MR (Manual Reset) pin on the TPS3128E12DBVTG4 is a low-active input that forces immediate RESET assertion regardless of VDD level or watchdog state. When pulled low, it overrides all internal supervision logic and holds RESET active for the full 180 ms delay after MR returns high - enabling hardware-triggered system recovery.

Is the RESET output of the TPS3128E12DBVTG4 push-pull or open-drain?

The TPS3128E12DBVTG4 features an open-drain active-low RESET output, confirmed by TI's device comparison table and functional description. This allows wired-OR connection with other reset sources and supports level-shifting via external pull-up to voltages up to VDD + 0.3 V, unlike push-pull variants such as TPS3123E12DBVR.

What package type and dimensions does the TPS3128E12DBVTG4 use?

The TPS3128E12DBVTG4 uses a 5-pin SOT-23 (DBV) package with nominal body dimensions of 2.90 mm × 1.60 mm. This compact surface-mount footprint is standardized across the TPS312x family and supports automated assembly in high-density PCB designs for portable and embedded applications.