Texas Instruments TPS3128E12DBVRG4

Overview

TPS3128E12DBVRG4 from Texas Instruments is an ultra-low-voltage processor supervisory IC with 1.14 V nominal reset threshold, manual reset (MR) input, watchdog timer (WDI), and open-drain active-low RESET output. It operates from 0.9 V to 3.3 V supply, draws 14 µA typical quiescent current, and delivers 180 ms power-on reset delay - designed for reliable system initialization in battery-powered DSP and microcontroller applications.

For engineers reviewing the TPS3128E12DBVRG4 datasheet, TPS3128E12DBVRG4 pinout, TPS3128E12DBVRG4 application, or TPS3128E12DBVRG4 equivalent, this device supports voltage supervision down to 0.9 V, integrates MR-triggered and watchdog-initiated reset assertion, and targets space-constrained embedded systems requiring precise 1.14 V rail monitoring with thermal stability across –40°C to +85°C.

Technical Context

The TPS3128E12DBVRG4 implements a fixed-threshold voltage supervisor with internal hysteresis (20 mV at 1.14 V) and a 1.4 s watchdog timeout. Its functional block includes independent MR and WDI inputs feeding into reset logic with a fixed 180 ms delay timer, ensuring deterministic deassertion after VDD exceeds VIT+ = VIT− + VHYS.

This variant belongs to the TPS312x family's E-series (–5% threshold offset), confirming 1.10–1.18 V VIT− range at –40°C to +85°C. It uses open-drain output topology, requiring external pull-up, and supports manual reset assertion regardless of VDD level or watchdog state - critical for field-service recovery and safe firmware updates.

Key Specifications

Pinout & Package

TPS3128E12DBVRG4 is housed in a 5-pin SOT-23 (DBV) package, 2.90 mm × 1.60 mm body size, with gull-wing leads and RoHS-compliant NiPdAu/Sn lead finish (MSL Level-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3128E12DBVRG4, TPS3123E12DBVR offers identical supervision performance in standard packaging, while MAX6326XR31D3+ trades 1.2 V compatibility and watchdog capability for lower quiescent current and higher threshold - making it unsuitable as a drop-in replacement but viable for non-overlapping voltage domains.

Availability

TPS3128E12DBVRG4 is available at Aetrix Electronics and suitable for industrial automation, wireless sensor networks, and portable medical devices requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS3128E12DBVRG4 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 and embedded processing solutions, with over 50 years of innovation in power management, signal chain, and microcontrollers.

The TPS312x product line was engineered specifically for low-voltage processor supervision in DSP, MCU, and FPGA systems - emphasizing ultra-low supply operation, integrated watchdog functionality, and minimal external component count.

FAQ

What is the exact reset threshold voltage of the TPS3128E12DBVRG4?

The TPS3128E12DBVRG4 has a nominal reset threshold voltage of 1.14 V, with a guaranteed range of 1.10 V to 1.18 V across –40°C to +85°C operating temperature. This value corresponds to the "E12" suffix, indicating a –5% offset from the nominal 1.2 V supply rail, and is factory-trimmed without requiring external resistors. The internal hysteresis is 20 mV, ensuring noise immunity during threshold crossing.

Does the TPS3128E12DBVRG4 support both manual reset and watchdog functionality?

Yes, the TPS3128E12DBVRG4 integrates both manual reset (MR) and watchdog timer (WDI) functions. Pulling the MR pin low forces immediate RESET assertion regardless of VDD level or watchdog state. The WDI pin monitors edge transitions - failure to retrigger within ~1.4 s causes automatic RESET assertion. Both features operate independently and can coexist in the same system design.

What package type and footprint does the TPS3128E12DBVRG4 use?

The TPS3128E12DBVRG4 uses a 5-pin SOT-23 (DBV) package with 2.90 mm × 1.60 mm body dimensions and gull-wing leads. Its pinout is standardized across the TPS312x family: Pin 1 = RESET (open-drain), Pin 2 = GND, Pin 3 = MR, Pin 4 = WDI, Pin 5 = VDD. The "G4" suffix denotes a moisture-sensitivity level 1 rating with peak reflow at 260°C.

Can the TPS3128E12DBVRG4 operate from a 0.9 V supply?

Yes, the TPS3128E12DBVRG4 is fully specified to operate from 0.9 V to 3.3 V supply voltage. At 0.9 V, it draws 14 µA typical supply current and maintains valid RESET output behavior - including MR responsiveness and watchdog timing - enabling use in energy-constrained and emerging sub-1 V digital systems where traditional supervisors fail.

Is the RESET output of the TPS3128E12DBVRG4 push-pull or open-drain?

The RESET output of the TPS3128E12DBVRG4 is open-drain active-low. This requires an external pull-up resistor to define the high-state voltage level, enabling flexible interfacing with different logic families and wired-OR configurations with other supervisors. Unlike push-pull variants (e.g., TPS3124), this topology avoids contention when multiple devices share a common reset bus.