Texas Instruments TPS3125G15DBVTG4

Overview

TPS3125G15DBVTG4 from Texas Instruments is a precision ultra-low-voltage processor supervisory circuit with 1.40 V nominal reset threshold (V_IT−), 180 ms fixed power-on reset delay, manual reset input (MR), and active-high push-pull RESET output - designed for reliable system initialization in battery-powered DSP and microcontroller applications.

For engineers reviewing the TPS3125G15DBVTG4 datasheet, TPS3125G15DBVTG4 pinout, TPS3125G15DBVTG4 application, or TPS3125G15DBVTG4 equivalent, key selection criteria include its 1.40 V threshold tolerance (±0.05 V), 14 µA supply current at 0.9 V, –40°C to +85°C operation, SOT-23-5 package compatibility, and absence of watchdog timer functionality.

Technical Context

The TPS3125G15DBVTG4 implements a fixed-threshold voltage supervision architecture with internal hysteresis (20 mV) to prevent false triggering during supply ramp-up or noise events. It asserts an active-high RESET signal when V_DD falls below 1.40 V and holds it asserted for 180 ms after V_DD rises above the hysteresis-enhanced threshold (V_IT+ = V_IT− + V_HYS).

Unlike TPS3123/3124/3128 variants, this device lacks watchdog timer input (WDI) but includes a dedicated manual reset input (MR) that forces active-high RESET assertion on logic-low assertion - enabling external fault recovery independent of supply voltage or software state.

Key Specifications

Pinout & Package

SOT-23-5 package (2.90 mm × 1.60 mm body, 0.95 mm max height), surface-mount, RoHS-compliant, moisture sensitivity level 1 (260°C peak reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3124G15DBVR, TPS3125G15DBVTG4 offers identical electrical performance and pinout but ships in tube packaging - critical for low-volume prototyping or repair. Versus TPS3808G15DBVR, it trades ultra-low I_DD for simpler active-high push-pull interface and fixed 180 ms timing, reducing design validation effort.

Availability

TPS3125G15DBVTG4 is available at Aetrix Electronics and suitable for battery-powered IoT sensors, industrial PLC I/O modules, and medical wearable monitors requiring stable component supply across long production lifecycles.

Supply support for TPS3125G15DBVTG4 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 personal electronics markets.

The TPS312x family was engineered specifically for low-voltage, high-reliability processor supervision - emphasizing minimal quiescent current, precise fixed thresholds, and robust manual reset capability in compact SOT-23-5 packaging.

FAQ

What is the exact reset threshold voltage of the TPS3125G15DBVTG4?

The TPS3125G15DBVTG4 has a nominal reset threshold voltage (V_IT−) of 1.40 V, with a guaranteed range of 1.35 V to 1.45 V across –40°C to +85°C. This value is factory-trimmed and fixed - no external components are required to set or adjust the threshold, ensuring consistent 1.5 V rail supervision without calibration.

Does the TPS3125G15DBVTG4 include a watchdog timer function?

No, the TPS3125G15DBVTG4 does not include a watchdog timer. It belongs to the TPS3125 subgroup, which provides manual reset (MR) and active-high push-pull RESET but omits the WDI pin and associated timeout logic. For watchdog capability, consider TPS3123G15DBVR or TPS3124G15DBVR instead.

What is the function of Pin 4 (NC) on the TPS3125G15DBVTG4?

Pin 4 on the TPS3125G15DBVTG4 is designated NC (No Connect) - it is internally unconnected and must remain unpopulated and electrically floating. Routing traces to or placing solder on this pin may cause functional failure or damage; the SOT-23-5 footprint must respect this isolation per TI's mechanical drawings.

How does the manual reset (MR) input behave on the TPS3125G15DBVTG4?

The MR input on the TPS3125G15DBVTG4 is an active-low, internally pulled up (90 kΩ) digital input. When driven to logic low, it immediately forces the RESET output high for the full 180 ms delay period - regardless of V_DD level or threshold status. Release from MR returns RESET to inactive (low) after the delay expires.

Is the TPS3125G15DBVTG4 pin-compatible with other TPS312x devices in SOT-23-5?

Yes, the TPS3125G15DBVTG4 shares the identical SOT-23-5 pinout (RESET, GND, MR, NC, V_DD) with all TPS312x family members in the DBV package. However, functional differences exist: TPS3123/3124/3128 include WDI, TPS3124/3125/3126 offer active-high RESET, and TPS3126/3128 use open-drain outputs - verify signal compatibility before substitution.