Texas Instruments TPS3123G15DBVR

Overview

TPS3123G15DBVR from Texas Instruments is an ultra-low-voltage processor supervisory IC with 1.40 V reset threshold, 180 ms power-on reset delay, manual reset (MR) input, and watchdog timer (WDI) functionality. It operates from 0.75 V to 3.3 V supply, draws 14 µA typical supply current, and delivers open-drain active-low RESET output - used for reliable initialization of low-voltage DSPs and microcontrollers in battery-powered systems.

For engineers reviewing the TPS3123G15DBVR datasheet, TPS3123G15DBVR pinout, TPS3123G15DBVR application, or TPS3123G15DBVR equivalent, key selection criteria include its fixed 1.40 V threshold accuracy (±50 mV), MR-triggered reset capability, 0.8 s watchdog timeout, SOT-23-5 package compatibility, and -40°C to 85°C industrial temperature range.

Technical Context

The TPS3123G15DBVR integrates a precision voltage reference, internal timing circuitry for 180 ms reset assertion after VDD exceeds VIT, and a transition-sensitive watchdog timer retriggered by WDI edges. Its MR input enables external system-initiated reset independent of supply monitoring.

This device implements open-drain RESET output topology with guaranteed low-level output voltage ≤0.4 V at 1.4 mA load and high-impedance inactive state. It requires no external components and maintains functional operation down to 0.75 V supply voltage.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.9 mm × 1.6 mm footprint, 1.0 mm height, surface-mount, tape-and-reel (3000 pcs/reel).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3123G15DBVR, TPS3124G15DBVR removes MR flexibility and changes output topology, while TPS3808G15DBVR trades off 10× higher quiescent current for programmable delay - making TPS3123G15DBVR optimal for fixed-delay, ultra-low-power, open-drain bus applications.

Availability

TPS3123G15DBVR is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wireless edge node gateways, and notebook embedded controllers requiring stable component supply across extended product lifecycles.

Supply support for TPS3123G15DBVR 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 founded in 1930, delivering analog and embedded processing solutions across industrial, automotive, and personal electronics markets.

The TPS312x family was designed specifically for ultralow-voltage supervision of DSPs, microcontrollers, and microprocessors in battery-constrained and industrial environments - emphasizing minimal supply voltage, fixed timing, and integrated fault recovery.

FAQ

What is the exact reset threshold voltage of the TPS3123G15DBVR?

The TPS3123G15DBVR has a nominal reset threshold voltage of 1.40 V, with a specified range of 1.35 V to 1.45 V across the full -40°C to 85°C temperature range. This value is factory-trimmed and does not require external calibration. The TPS3123G15DBVR achieves this precision using an internal high-accuracy voltage divider, ensuring reliable supervision of 1.5 V supply rails under varying load and temperature conditions.

Does the TPS3123G15DBVR support manual reset functionality?

Yes, the TPS3123G15DBVR includes a dedicated manual reset (MR) input on Pin 4. A logic-low signal applied to MR forces the RESET output active regardless of VDD level, enabling system-level reset initiation. The MR pin features an internal 27 kΩ pullup to VDD, so it remains inactive when left unconnected. This functionality is confirmed in the TPS3123G15DBVR functional block diagram and timing diagrams in the official SLVS227B datasheet.

What is the watchdog timeout period for the TPS3123G15DBVR?

The watchdog timeout period for the TPS3123G15DBVR is 0.8 s (typical), with a maximum of 2.1 s across temperature and process variation. The watchdog is edge-triggered via the WDI pin (Pin 5) and resets its internal timer on each rising or falling transition. If no transition occurs within the timeout window, RESET is asserted for the full 180 ms delay period. This behavior is explicitly defined in the TPS3123G15DBVR switching characteristics table.

What package type and pin count does the TPS3123G15DBVR use?

The TPS3123G15DBVR uses the SOT-23-5 (DBV) package: a 5-pin, surface-mount plastic package measuring 2.9 mm × 1.6 mm with 1.0 mm height. Pinout is standardized across the TPS312x family - VDD (1), GND (2), RESET (3), MR (4), WDI (5) - and is verified in the "DBV PACKAGE (TOP VIEW)" diagram in the SLVS227B datasheet. The 'R' suffix indicates tape-and-reel packaging (3000 units per reel).

Can the TPS3123G15DBVR operate from a 0.8 V supply?

Yes, the TPS3123G15DBVR is fully operational from a minimum supply voltage of 0.75 V, as confirmed in the Absolute Maximum Ratings and Recommended Operating Conditions tables. At 0.8 V, it maintains valid reset assertion, MR responsiveness, and watchdog functionality - though the RESET output low-voltage specification degrades slightly (to ≤0.2 × VDD). This capability makes the TPS3123G15DBVR suitable for deep-brownout recovery in energy-harvesting and ultra-low-power systems.