Texas Instruments TPS3125L30DBVR

Overview

TPS3125L30DBVR from Texas Instruments is an ultra-low-voltage processor supervisory IC with 2.64 V reset threshold, 180 ms power-on reset delay, manual reset (MR) input, and push-pull active-low RESET output in SOT-23-5 package. It monitors supply voltage for low-power DSPs and microcontrollers in battery-powered systems requiring precise brownout detection.

For engineers reviewing the TPS3125L30DBVR datasheet, TPS3125L30DBVR pinout, TPS3125L30DBVR application, or TPS3125L30DBVR equivalent, key selection criteria include its 2.64 V ±30 mV threshold accuracy, 14 µA typical supply current at 3.3 V, -40°C to 85°C operation, MR-enabled system-level reset control, and compatibility with 0.75 V minimum VDD startup.

Technical Context

The TPS3125L30DBVR implements a precision internal voltage divider to set its 2.64 V negative-going threshold (VIT−), with 30 mV hysteresis for noise immunity. Its internal timer initiates a fixed 180 ms delay after VDD exceeds VIT− before deasserting RESET.

It features a dedicated manual reset input (MR) that forces active-low RESET when pulled low, independent of VDD status. The device uses push-pull output topology-no external pull-up required-and supports operation down to 0.75 V supply voltage during power-up sequencing.

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.9 mm × 1.6 mm × 1.1 mm body, gull-wing leads, 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 TPS3125L30DBVT, the TPS3125L30DBVR offers identical performance in a higher-volume reel format; versus TPS3808G30DBVR, it provides integrated MR and fixed timing at lower system cost and reduced design effort, making it optimal for cost-sensitive, MR-dependent embedded systems.

Availability

TPS3125L30DBVR is available at Aetrix Electronics and suitable for battery-powered IoT nodes, low-voltage DSP power management, and industrial PLC I/O modules requiring stable component supply with guaranteed long-term sourcing.

Supply support for TPS3125L30DBVR 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 with over 90 years of innovation in power management and signal chain technologies.

The TPS312x family was designed specifically for ultra-low-voltage supervision of DSPs, microcontrollers, and microprocessors in portable, battery-operated, and industrial systems demanding precision reset timing and minimal quiescent power.

FAQ

What is the exact reset threshold voltage of the TPS3125L30DBVR and how tightly is it specified?

The TPS3125L30DBVR has a nominal negative-going reset threshold voltage (VIT−) of 2.64 V, with a guaranteed range of 2.57 V to 2.71 V over -40°C to 85°C. This ±30 mV tolerance is achieved via a laser-trimmed internal voltage divider and ensures consistent brownout detection across temperature and process variation without external calibration.

Does the TPS3125L30DBVR include a watchdog timer function?

No, the TPS3125L30DBVR does not include a watchdog timer. Per the official TPS312x family datasheet (SLVS227B), only TPS3123/3124/3128 variants feature WDI functionality; TPS3125 and TPS3126 devices omit the watchdog circuit entirely. Pin 5 (WDI) on TPS3125L30DBVR is a no-connect and must be left floating or tied to GND per layout guidelines.

What is the purpose of the MR pin on the TPS3125L30DBVR and how should it be used?

The MR (Manual Reset) pin on the TPS3125L30DBVR is an active-low input that forces the RESET output low regardless of VDD level, enabling system-level reset initiation. It features an internal 27 kΩ pullup, so a simple open-drain or push-pull GPIO can drive it low. This allows host processors, FPGAs, or front-panel buttons to trigger a clean hardware reset without cycling power.

Can the TPS3125L30DBVR operate from a 0.9 V supply?

Yes, the TPS3125L30DBVR can operate from as low as 0.75 V, so it functions reliably at 0.9 V. However, its 2.64 V reset threshold means it will assert RESET continuously below that level - it does not supervise sub-2.64 V rails. At 0.9 V, the device remains powered and functional but keeps RESET asserted until VDD rises above 2.57 V (minimum threshold).

What package type and dimensions does the TPS3125L30DBVR use, and is it RoHS-compliant?

The TPS3125L30DBVR uses the SOT-23-5 (DBV) package: 2.9 mm × 1.6 mm × 1.1 mm body size with 0.95 mm lead pitch. It is RoHS-compliant and halogen-free per Texas Instruments' product change notices, and qualified for standard Pb-free reflow profiles (JEDEC J-STD-020).