Texas Instruments TPS3125G15DBVR

Overview

TPS3125G15DBVR from Texas Instruments is an ultra-low-voltage processor supervisory IC with 1.40 V nominal reset threshold, push-pull active-high RESET output, manual reset (MR) input, and fixed 180 ms power-on reset delay. It operates down to 0.9 V supply voltage, draws 14 µA typical supply current, and is rated for –40°C to +85°C ambient temperature. This device monitors 1.5 V rails in battery-powered DSP and microcontroller systems requiring reliable power-up sequencing and fault recovery.

For engineers reviewing the TPS3125G15DBVR datasheet, TPS3125G15DBVR pinout, TPS3125G15DBVR application, or TPS3125G15DBVR equivalent, key selection criteria include its G15 (1.40 V) threshold accuracy, MR-triggered reset capability, active-high push-pull output topology, and SOT-23-5 package compatibility with space-constrained embedded designs.

Technical Context

The TPS3125G15DBVR implements a fixed-threshold voltage supervisor with internal hysteresis (20 mV at 1.4 V) and a dedicated manual reset input that forces RESET assertion independent of VDD level or watchdog state. Its active-high push-pull output drives high during reset and returns low after the 180 ms delay when VDD exceeds VIT+ = VIT− + VHYS.

Unlike TPS3123/3124/3128 variants, this part lacks watchdog timer functionality but retains MR support and shares the same 5-pin SOT-23 package, 0.9–3.3 V operating range, and –40°C to +85°C temperature specification as the family.

Key Specifications

Pinout & Package

TPS3125G15DBVR is housed in a 5-pin SOT-23 (DBV) package measuring 2.90 mm × 1.60 mm, optimized for high-density PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3124G15DBVR, TPS3125G15DBVR adds MR for field-service recovery; compared with TPS3808G15DBVR, it offers higher drive strength, active-high logic, and faster wake-up response at the cost of 10× higher quiescent current.

Availability

TPS3125G15DBVR is available at Aetrix Electronics and suitable for industrial automation, portable medical devices, smart building controllers, and edge AI modules requiring stable component supply across multi-year production cycles.

Supply support for TPS3125G15DBVR 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 for industrial, automotive, and personal electronics markets.

The TPS312x product line delivers ultra-low-voltage supervisory circuits for DSP and microcontroller-based systems, emphasizing precision threshold accuracy, minimal quiescent power, and robust reset timing in miniature packages.

FAQ

What is the exact reset threshold voltage of the TPS3125G15DBVR?

The TPS3125G15DBVR has a nominal reset threshold voltage of 1.40 V, with guaranteed min/max values of 1.35 V and 1.45 V across –40°C to +85°C. This G15 suffix denotes a factory-trimmed 7% below nominal 1.5 V rail, enabling accurate supervision without external components. The TPS3125G15DBVR uses internal hysteresis of 20 mV to prevent chatter during supply transients.

Does the TPS3125G15DBVR include a watchdog timer function?

No, the TPS3125G15DBVR does not include a watchdog timer. It belongs to the TPS3125 subfamily, which provides manual reset (MR) and active-high push-pull RESET output but omits the WDI input and timeout logic found in TPS3123/3124/3128 variants. The TPS3125G15DBVR relies solely on supply voltage monitoring and MR-triggered reset. For watchdog capability, consider TPS3123G15DBVR instead.

What is the function of Pin 4 on the TPS3125G15DBVR?

Pin 4 on the TPS3125G15DBVR is a no-connect (NC) terminal. It is internally unconnected and must be left floating or tied to GND per TI's layout recommendations. This differs from TPS3123/3124 variants where Pin 4 serves as WDI (watchdog input) or RESET (active-low), confirming the TPS3125G15DBVR's dedicated MR + active-high RESET configuration. Always verify pinout using Figure 5-3 in the official SLVS227H datasheet.

Can the TPS3125G15DBVR operate from a 0.9 V supply?

Yes, the TPS3125G15DBVR is fully specified to operate from 0.9 V to 3.3 V supply voltage. At 0.9 V, it draws 14 µA typical supply current and maintains valid RESET assertion/deassertion behavior. However, RESET output voltage levels (VOH/VOL) and timing parameters (td, tPHL) are characterized down to 0.9 V, making it suitable for ultra-low-power systems such as energy-harvesting sensors or backup power domains where other supervisors fail to function.

What package type and dimensions does the TPS3125G15DBVR use?

The TPS3125G15DBVR uses a 5-pin SOT-23 (DBV) package with nominal body dimensions of 2.90 mm × 1.60 mm. It is RoHS-compliant, lead-free (NIPDAU/SN finish), and rated for Level-1 moisture sensitivity (260°C peak reflow). The package supports standard pick-and-place and reflow processes, and its small footprint enables placement near processors or PMICs in space-constrained designs. Pin spacing is 0.95 mm pitch, consistent with JEDEC MO-178 standards.