Texas Instruments TPS3125G15DBVT

Overview

TPS3125G15DBVT from Texas Instruments is an ultralow-voltage processor supervisory IC with 1.40 V reset threshold, 180 ms power-on reset delay, manual reset (MR) input, and push-pull active-low RESET output. It operates from 0.75 V to 3.3 V supply, draws 14 µA typical supply current, and is qualified for -40°C to 85°C industrial temperature range. It is used in low-voltage DSP and microcontroller power sequencing.

For engineers reviewing the TPS3125G15DBVT datasheet, TPS3125G15DBVT pinout, TPS3125G15DBVT application, or TPS3125G15DBVT equivalent, key selection criteria include its fixed 1.40 V threshold accuracy (±50 mV), MR-enabled system-level reset control, push-pull output drive capability (1.4 mA sink at 1.5 V), and SOT-23-5 package compatibility with space-constrained portable designs.

Technical Context

The TPS3125G15DBVT integrates a precision voltage reference, comparator, power-on reset timer, and manual reset logic into a single monolithic circuit. Its internal 1.40 V threshold is set by a high-precision resistor divider, with 20 mV hysteresis for noise immunity on the VDD monitoring path.

It features a dedicated MR input that forces active-low RESET assertion independent of VDD level, and supports push-pull output topology-eliminating external pull-up components required by open-drain alternatives. The device does not include watchdog functionality, distinguishing it from TPS3123/3124/3128 variants.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.9 mm × 1.6 mm × 1.15 mm body, gull-wing leads, 0.95 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3125G15DBVT, TPS3125J12DBVT lowers the reset threshold for tighter coupling to 1.2 V supplies, while TPS3125J18DBVT raises it for robustness in 1.8 V systems-both retain identical timing, MR support, and push-pull drive, enabling drop-in replacement with only threshold voltage revalidation.

Availability

TPS3125G15DBVT is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and wireless edge node gateways requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for TPS3125G15DBVT 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 specializing in analog, embedded processing, and connectivity technologies, with leadership in power management and signal chain solutions.

The TPS312x family was designed specifically for ultralow-voltage supervision of DSPs, microcontrollers, and microprocessors in battery-powered and space-constrained systems-emphasizing minimal supply voltage, precise thresholds, and integrated timing.

FAQ

What is the exact reset threshold voltage of the TPS3125G15DBVT?

TPS3125G15DBVT has a nominal reset threshold voltage of 1.40 V, with a guaranteed range of 1.35 V to 1.45 V over the full -40°C to 85°C temperature range. This value is factory-trimmed and specified in Table 1 of the SLVS227B datasheet. The 'G15' suffix explicitly denotes the 1.40 V variant within the TPS3125 family, and TPS3125G15DBVT maintains this threshold without external calibration or adjustment.

Does the TPS3125G15DBVT include watchdog timer functionality?

No, the TPS3125G15DBVT does not include watchdog timer functionality. Unlike TPS3123/3124/3128 variants, the TPS3125 series omits the watchdog circuit. Pin 5 (WDI) is internally tied high and unused-no external connection is required or supported. This simplifies design for applications where only power-on and manual reset supervision is needed, and TPS3125G15DBVT is explicitly characterized without watchdog timing parameters.

What is the output configuration of the TPS3125G15DBVT RESET pin?

The TPS3125G15DBVT features a push-pull active-low RESET output. It actively drives low during reset assertion and actively drives high (not high-impedance) when inactive. This eliminates the need for an external pull-up resistor. The datasheet specifies 1.4 mA sink capability at 1.5 V VDD and 0.2×VDD low-level output voltage under load-confirming true push-pull behavior, and TPS3125G15DBVT is listed in Table 2 as having push-pull topology.

Can the TPS3125G15DBVT operate from a 0.8 V supply?

Yes, the TPS3125G15DBVT can operate from a 0.8 V supply. Its absolute minimum supply voltage is 0.75 V, and recommended operating conditions specify VDD ≥ 0.85 V for full functionality-including reliable MR input detection and RESET assertion. At 0.8 V, the device remains powered and functional, though timing parameters like td may vary slightly; TPS3125G15DBVT is fully characterized down to 0.75 V in Electrical Characteristics tables.

Is the TPS3125G15DBVT pin-compatible with other TPS3125 variants?

Yes, all TPS3125-x variants-including TPS3125G15DBVT, TPS3125J12DBVT, and TPS3125J18DBVT-are pin-compatible in the SOT-23-5 (DBV) package. They share identical pinout (VDD, GND, RESET, MR, WDI), timing (180 ms delay), MR functionality, and push-pull output structure. Only the reset threshold voltage differs; TPS3125G15DBVT is therefore a direct hardware replacement for other TPS3125 DBVT variants when threshold alignment is verified.