Texas Instruments TPS3124G15DBVTG4

Overview

TPS3124G15DBVTG4 from Texas Instruments is an ultralow-voltage processor supervisory circuit with 1.40 V reset threshold, 180 ms power-on reset delay, watchdog timer (0.8 s timeout), push-pull active-low RESET output, and operation down to 0.75 V supply. It monitors VDD in low-voltage DSP/microcontroller systems and asserts RESET during brownout or startup.

For engineers reviewing the TPS3124G15DBVTG4 datasheet, TPS3124G15DBVTG4 pinout, TPS3124G15DBVTG4 application, or TPS3124G15DBVTG4 equivalent, key selection criteria include its fixed 1.40 V threshold, absence of manual reset (MR) input, SOT-23-5 package compatibility, and watchdog supervision for fail-safe system recovery in battery-powered embedded designs.

Technical Context

The TPS3124G15DBVTG4 implements a precision internal voltage divider to set its 1.40 V (±5%) reset threshold (VIT−), with 20 mV hysteresis for noise immunity. Its watchdog timer requires periodic WDI transitions and triggers RESET if untriggered for ≥0.8 s (typ), reinitializing on timeout.

This device uses a push-pull output stage delivering VOH ≥0.8×VDD at IOH = −1 mA and VOL ≤0.4 V at IOL = 3 mA (VDD = 3.3 V), enabling direct interface with CMOS logic without external pull-ups. It operates across −40°C to 85°C with supply current as low as 14 µA (VDD = 0.75 V).

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.9 mm × 1.6 mm × 1.1 mm body, gull-wing leads, 0.95 mm pitch, RoHS-compliant, tape-and-reel (250 pcs per reel).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar processor supervisory applications.

Compared with TPS3124G15DBVTG4, the J12 variant lowers the reset threshold for earlier fault detection on 1.2 V systems, while the J18 variant raises it for robustness on 1.8 V rails-both retain identical watchdog, delay, and output architecture but shift the voltage trip point to match different supply domains.

Availability

TPS3124G15DBVTG4 is available at Aetrix Electronics and suitable for battery-powered IoT nodes, low-voltage DSP audio processors, and industrial programmable logic controllers requiring stable component supply with guaranteed long-term sourcing.

Supply support for TPS3124G15DBVTG4 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 company headquartered in Dallas, Texas, designing analog, embedded processing, and wireless chips for industrial, automotive, and consumer markets.

The TPS312x family was developed specifically for ultralow-voltage supervision of DSPs and microcontrollers in portable and energy-constrained systems, emphasizing sub-1 V operation, minimal quiescent current, and integrated watchdog reliability.

FAQ

What is the exact reset threshold voltage of the TPS3124G15DBVTG4?

The TPS3124G15DBVTG4 has a typical reset threshold voltage (VIT−) of 1.40 V, with a guaranteed range of 1.33 V to 1.47 V (±5%) over the full −40°C to +85°C operating temperature range. This value is factory-trimmed and does not require external calibration.

Does the TPS3124G15DBVTG4 include a manual reset (MR) input?

No, the TPS3124G15DBVTG4 does not include a manual reset (MR) input. Unlike TPS3123/5/6/8 variants, this device omits MR to reduce pin count and simplify layout for applications where only power-supply monitoring and watchdog supervision are needed.

What is the watchdog timeout period for the TPS3124G15DBVTG4?

The watchdog timeout period for the TPS3124G15DBVTG4 is 0.8 s (typical), with a maximum of 2.1 s over temperature and process variation. The timer resets on each valid edge transition at the WDI pin and asserts RESET if no transition occurs within this interval.

What output configuration does the TPS3124G15DBVTG4 use for its RESET signal?

The TPS3124G15DBVTG4 uses a push-pull active-low RESET output on both Pin 4 and Pin 5. This eliminates the need for an external pull-up resistor and provides strong drive capability (3 mA sink, 1 mA source), ensuring clean logic-level transitions into CMOS inputs.

Is the TPS3124G15DBVTG4 compatible with 0.75 V supply rails?

Yes, the TPS3124G15DBVTG4 is fully operational down to 0.75 V supply voltage, drawing only 14 µA (typical) at that level. Its internal reference and timing circuits remain functional, enabling reliable supervision in ultra-low-power and energy-harvesting applications.