Texas Instruments TPS3103E12DBVRG4

Overview

TPS3103E12DBVRG4 from Texas Instruments is an ultralow-quiescent-current voltage supervisor IC with fixed 1.2 V reset threshold, open-drain active-low RESET output, and integrated power-fail detection (PFI/PFO). It monitors VDD supply voltage in low-power systems, asserts RESET when VDD falls below 1.142 V (typical), and supports operation down to 0.4 V supply for early power-on reset assertion - used in battery-backed microcontroller reset sequencing.

For engineers reviewing the TPS3103E12DBVRG4 datasheet, TPS3103E12DBVRG4 pinout, TPS3103E12DBVRG4 application, or TPS3103E12DBVRG4 equivalent, this page delivers verified electrical specs, SOT-23-6 pin mapping, real-world supervision timing (130 ms delay), PFI comparator behavior (0.551 V reference), and validated alternative options for low-voltage, low-I_DD reset management.

Technical Context

The TPS3103E12DBVRG4 implements a precision bandgap-based voltage reference and comparator architecture to supervise VDD against a factory-trimmed 1.2 V threshold (±0.75% accuracy). Its internal 130 ms power-on reset timer initiates only after VDD exceeds V_IT– + V_HYS (≥1.162 V), ensuring stable release of RESET.

It integrates a dedicated PFI input referenced to 0.551 V (±0.009 V at 25°C) with corresponding open-drain PFO output, enabling independent monitoring of auxiliary rails (e.g., backup battery or secondary supply) without affecting main RESET logic. MR pin provides manual reset override with internal 100 kΩ pullup.

Key Specifications

Pinout & Package

TPS3103E12DBVRG4 is housed in a 6-pin SOT-23 (DBV) package measuring 2.90 mm × 2.80 mm, optimized for space-constrained 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 TPS3103E12DBVRG4, TPS3103E12DBVT offers identical supervision functionality in alternate packaging, while TPS3808G12QDBVRQ1 trades PFI capability for automotive qualification and lower quiescent current - making the original optimal for cost-sensitive industrial dual-rail monitoring.

Availability

TPS3103E12DBVRG4 is available at Aetrix Electronics and suitable for portable medical devices, battery-powered instrumentation, and industrial control modules requiring stable component supply across extended product lifecycles.

Supply support for TPS3103E12DBVRG4 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 engineering excellence and broad industrial design-in reach.

The TPS31xx family was engineered specifically for ultralow-power, high-accuracy voltage supervision in battery-critical and energy-constrained systems - emphasizing precision threshold stability, nanoscale current efficiency, and dual-rail fault detection.

FAQ

What is the exact reset threshold voltage of the TPS3103E12DBVRG4, and how does it vary with temperature?

The TPS3103E12DBVRG4 has a nominal reset threshold (V_IT–) of 1.2 V, with a typical value of 1.142 V at 25°C and guaranteed range of 1.133 V to 1.151 V. Over –40°C to +125°C, the threshold shifts by ≤±0.065 V (1.084 V to 1.199 V), exhibiting a temperature coefficient of –0.012%/K. This tight drift ensures reliable brownout detection across full industrial temperature operation of the TPS3103E12DBVRG4.

Does the TPS3103E12DBVRG4 support monitoring a second voltage rail, and if so, how is it implemented?

Yes - the TPS3103E12DBVRG4 includes a dedicated PFI (power-fail input) pin referenced to an internal 0.551 V comparator. By connecting an external resistor divider from the auxiliary rail to PFI, users can monitor voltages >0.551 V (e.g., 2.4 V battery via 4.3:1 divider). The resulting PFO output is independent of VDD status and asserts low when the divided voltage falls below 0.551 V - a core capability of the TPS3103E12DBVRG4 not found in basic single-rail supervisors.

What is the minimum supply voltage required for the TPS3103E12DBVRG4 to assert RESET during power-up?

The TPS3103E12DBVRG4 asserts RESET as soon as VDD rises above 0.4 V, enabling early reset assertion even during ultra-slow or weak power-rail ramp-up - critical for energy-harvesting or capacitor-powered systems. Full supervision (including PFI comparison and MR response) requires VDD ≥ 0.8 V, but the fundamental RESET function remains active down to 0.4 V, a defining feature of the TPS3103E12DBVRG4.

How does the manual reset (MR) pin behave on the TPS3103E12DBVRG4, and what is its default state?

The MR pin on the TPS3103E12DBVRG4 is an active-low input with an internal 100 kΩ pullup resistor, so it defaults to logic high when left unconnected. Pulling MR low forces RESET low immediately and holds it for the full 130 ms timeout after MR returns high. No external pullup is needed, and debouncing is unnecessary due to built-in filtering - simplifying front-panel reset button implementation in the TPS3103E12DBVRG4.

Is the TPS3103E12DBVRG4 pin-compatible with other members of the TPS31xx family, such as the TPS3106 or TPS3110?

No - the TPS3103E12DBVRG4 is not pin-compatible with TPS3106 or TPS3110 variants. While all use the same SOT-23-6 (DBV) package, pin functions differ: TPS3103 uses Pin 5 for PFI and Pin 6 for PFO; TPS3106 uses Pin 5 for SENSE and Pin 1 for RSTSENSE; TPS3110 uses Pin 5 for WDI and Pin 1 for RESET. Swapping them without board revision will cause functional failure - the TPS3103E12DBVRG4 must be used per its specific pinout.