Texas Instruments TPS3128E12DBVT

Overview

TPS3128E12DBVT from Texas Instruments is an ultra-low-voltage processor supervisory IC with 1.14 V nominal reset threshold, 180 ms power-on reset delay, manual reset (MR) input, and watchdog timer (WDI) functionality. It monitors supply rails down to 0.9 V and asserts an active-low open-drain RESET output during undervoltage or watchdog timeout-used in battery-powered DSP systems requiring reliable startup and hang detection.

For engineers reviewing the TPS3128E12DBVT datasheet, TPS3128E12DBVT pinout, TPS3128E12DBVT application, or TPS3128E12DBVT equivalent, this page delivers verified specifications, SOT-23-5 package details, functional mode clarity (MR + WDI + open-drain), temperature range (–40°C to +85°C), and real-world substitution guidance for industrial and portable embedded designs.

Technical Context

The TPS3128E12DBVT integrates voltage supervision, a 1.14 V fixed threshold (±40 mV over temperature), and a 1.4 s typical watchdog timeout (0.8–2.1 s range). Its MR input forces RESET assertion independent of VDD level or watchdog state, while the open-drain RESET output supports flexible pull-up configurations in multi-rail systems.

It operates across 0.9 V to 3.3 V supply range with 14 µA typical quiescent current at 0.9 V, features built-in hysteresis (20 mV at 1.14 V threshold), and validates RESET only when VDD ≥ 0.9 V-ensuring robust behavior during brownout recovery and low-power wake-up sequences.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 5-pin surface-mount, lead-free (RoHS-compliant), moisture sensitivity level (MSL) 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3128E12DBVT, TPS3123E12DBVT removes watchdog functionality but retains identical voltage supervision and MR capability-ideal for cost-sensitive, non-hang-prone applications. MAX6326XR31D3+T offers higher threshold and push-pull drive but omits MR/WDI and demands layout changes, limiting drop-in replacement viability.

Availability

TPS3128E12DBVT is available at Aetrix Electronics and suitable for battery-powered DSP systems, industrial PLC controllers, wireless sensor nodes, and building automation gateways requiring stable component supply with long-term lifecycle support.

Supply support for TPS3128E12DBVT 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 specializing in analog, embedded processing, and power management technologies, with decades of experience in high-reliability industrial and automotive IC design.

The TPS312x family was engineered specifically for ultra-low-voltage supervision in DSP and processor-based systems-delivering integrated reset timing, watchdog, and manual reset in minimal SOT-23-5 footprint for space- and power-constrained embedded applications.

FAQ

What is the exact reset threshold voltage of the TPS3128E12DBVT?

The TPS3128E12DBVT has a nominal reset threshold voltage of 1.14 V, with a guaranteed range of 1.10 V to 1.18 V over the full operating temperature range (–40°C to +85°C). This value is factory-trimmed and fixed-no external components are needed to set or adjust it. The 'E12' suffix in TPS3128E12DBVT explicitly denotes this 1.14 V threshold variant within the TPS3128 family.

Does the TPS3128E12DBVT support both manual reset and watchdog timer functions?

Yes, the TPS3128E12DBVT integrates both manual reset (MR) and watchdog timer (WDI) functionality. Pulling the MR pin low forces an immediate active-low RESET assertion regardless of VDD level or WDI state. The WDI pin requires periodic edge transitions (rising or falling) within 1.4 s (typical) to prevent timeout-triggered RESET. Both features operate independently and concurrently in the TPS3128E12DBVT.

What output type does the TPS3128E12DBVT use, and how should it be interfaced?

The TPS3128E12DBVT uses an open-drain active-low RESET output. It must be pulled up externally-typically with a resistor to a compatible voltage rail (e.g., 1.2 V, 1.8 V, or 3.3 V)-to generate a valid logic-high inactive state. This topology enables wired-OR connections with other supervisors and supports level shifting across mixed-voltage systems, unlike push-pull outputs which fix the high-state voltage to VDD.

Is the TPS3128E12DBVT pin-compatible with other TPS312x devices in SOT-23-5 package?

Yes, the TPS3128E12DBVT shares identical pinout and SOT-23-5 (DBV) package dimensions with all TPS312x family members-including TPS3123E12DBVT, TPS3124J12DBVT, and TPS3125G15DBVT. Pin 1 is RESET, Pin 2 is GND, Pin 3 is MR, Pin 4 is WDI, and Pin 5 is VDD. However, functional differences (e.g., presence/absence of WDI or MR, output type) mean electrical compatibility must be verified per application.

What is the minimum supply voltage required for the TPS3128E12DBVT to operate correctly?

The TPS3128E12DBVT requires a minimum supply voltage of 0.9 V to ensure valid RESET output behavior and internal circuit functionality. Below 0.9 V, the RESET signal is undefined and not guaranteed to assert or deassert correctly. This ultra-low 0.9 V minimum enables operation with emerging sub-1 V power architectures and extends usable battery life in energy-constrained applications.