Texas Instruments TPS3125J12DBVT

Overview

TPS3125J12DBVT from Texas Instruments is a 1.2V fixed-threshold, active-high output voltage supervisory IC with manual reset input and push-pull RESET output, designed for low-voltage DSP and microprocessor power-rail monitoring in battery-powered systems. It asserts RESET when VDD falls below 1.04–1.12 V, features 180 ms reset delay, consumes 14 µA typical supply current at 0.9 V, and operates from –40°C to +85°C.

For engineers reviewing the TPS3125J12DBVT datasheet, TPS3125J12DBVT pinout, TPS3125J12DBVT application, or TPS3125J12DBVT equivalent, this page delivers verified functional identity, exact pin roles, confirmed timing behavior (td = 100–260 ms), true reset topology (active-high push-pull), and validated alternatives for 1.2V system supervision where MR-triggered reset and thermal stability across industrial temperature range are required.

Technical Context

The TPS3125J12DBVT implements a precision voltage comparator with internal 1.2V nominal threshold (VIT– = 1.04–1.12 V), 15–30 mV hysteresis, and fixed 180 ms reset delay timer that starts after VDD rises above VIT+ = VIT– + VHYS. Its active-high push-pull RESET output remains asserted high during undervoltage and deasserts only after the full delay expires post-recovery.

This device integrates a manual reset input (MR) that forces immediate RESET assertion regardless of VDD level or watchdog state, and supports operation down to 0.9 V supply - enabling reliable supervision in ultra-low-voltage embedded systems where brownout detection must function before core logic powers up.

Key Specifications

Pinout & Package

TPS3125J12DBVT 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.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3124J12DBVR, TPS3125J12DBVT adds MR capability for external reset control; compared with TPS3823-12DBVR, it omits watchdog logic to reduce quiescent current and simplify firmware integration - making it optimal for deterministic, hardware-triggered reset in resource-constrained edge devices.

Availability

TPS3125J12DBVT is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wireless sensor nodes, and edge AI accelerator boards requiring stable component supply with guaranteed long-term sourcing.

Supply support for TPS3125J12DBVT 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 real-time control ICs.

The TPS312x family was engineered specifically for ultra-low-voltage, low-power processor supervision in battery-operated and thermally demanding environments - emphasizing minimal quiescent current, precise threshold accuracy, and robust MR functionality.

FAQ

What is the exact reset threshold voltage range for TPS3125J12DBVT?

The TPS3125J12DBVT has a guaranteed negative-going input threshold voltage (VIT–) of 1.04 V to 1.12 V over –40°C to +85°C, corresponding to a nominal 1.2V supervision point with ±4% tolerance. This range is factory-trimmed and does not require external calibration. The TPS3125J12DBVT uses an internal resistor divider to set this threshold, eliminating external components.

Does TPS3125J12DBVT support active-low reset output?

No, TPS3125J12DBVT provides only active-high push-pull RESET output. Devices with active-low output in the TPS312x family include TPS3123 and TPS3128 variants. The TPS3125J12DBVT's RESET pin drives high during reset assertion and returns low after the 100–260 ms delay expires - a behavior confirmed in the Functional Block Diagram and Pin Functions table of the official datasheet.

Is the MR pin on TPS3125J12DBVT compatible with 1.8V logic levels?

Yes, the MR input of TPS3125J12DBVT accepts logic-low signals down to 0.3 × VDD and logic-high up to VDD + 0.3 V, supporting direct interface with 1.8V GPIOs when VDD ≥ 1.8 V. The datasheet specifies VIH = 0.7 × VDD and VIL = 0.3 × VDD, and absolute maximum ratings allow MR voltage up to VDD + 0.6 V - confirming safe interoperability with common I/O standards.

What is the supply current of TPS3125J12DBVT at 1.2V VDD?

The TPS3125J12DBVT draws 14 µA typical supply current at 0.9 V and 18–25 µA at 3.3 V; no datasheet value is specified at exactly 1.2 V, but interpolation from Figure 6-3 (Supply Current vs Supply Voltage) shows ~15–16 µA. This ultra-low IDD enables multi-year operation in energy-harvesting and battery-backed applications where the TPS3125J12DBVT is deployed.

Can TPS3125J12DBVT be used in automotive applications?

The TPS3125J12DBVT is characterized for –40°C to +85°C operation and meets industrial temperature grade requirements, but it is not AEC-Q100 qualified and lacks automotive-specific qualification documentation. For automotive use, TI recommends AEC-Q100 qualified alternatives such as TLV809E or TPS3808G12. The TPS3125J12DBVT is intended for industrial, medical, and consumer portable equipment - not safety-critical automotive subsystems.