Texas Instruments TPS3103H20DBVR

Overview

TPS3103H20DBVR from Texas Instruments is an ultralow-supply-current voltage supervisor IC with fixed 2.0V VDD threshold, open-drain active-low RESET output, integrated PFI/PFO for auxiliary voltage monitoring, and manual reset input. It operates from 0.9V to 3.6V supply, draws only 1.2μA typical quiescent current, maintains RESET assertion down to 0.4V VDD, and delivers 130ms power-on reset delay - used in battery-powered microcontroller systems requiring precise brownout detection and low-power supervision.

For engineers reviewing the TPS3103H20DBVR datasheet, TPS3103H20DBVR pinout, TPS3103H20DBVR application, or TPS3103H20DBVR equivalent, key selection criteria include its 2.0V ±0.75% trip accuracy, –40°C to 125°C operating range, SOT-23-6 package compatibility, PFI-based power-fail warning capability, and absence of watchdog timer - distinguishing it from TPS3110-series variants.

Technical Context

The TPS3103H20DBVR implements a dual-comparator architecture: one monitors VDD against a precision 2.0V internal reference (VIT– = 1.843V typ at 25°C, ±0.75% accuracy), while a second compares external PFI voltage against a fixed 0.551V reference. RESET is asserted low when either VDD falls below VIT– or PFI drops below 0.551V, with independent hysteresis (30mV on VDD, 15mV on PFI) preventing chatter during threshold crossings.

Its open-drain RESET output supports flexible pull-up configurations and interfaces directly with µC reset inputs; the PFO output provides asynchronous power-fail indication without affecting RESET timing. The MR pin features an internal 100kΩ pullup and triggers reset on logic-low assertion, with 130ms delay after release to ensure clean system initialization.

Key Specifications

Pinout & Package

TPS3103H20DBVR is housed in a 6-pin SOT-23 (DBV) package measuring 2.90mm × 2.80mm, 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 TPS3103H20DBVR, TPS3106K33DBVR offers dual-rail reset signaling but lacks PFI-based power-fail warning, while TPS3823-25DBVR adds watchdog capability at the cost of higher supply current (15μA) and no auxiliary monitoring - making TPS3103H20DBVR optimal for low-power, dual-threshold supervision without software dependency.

Availability

TPS3103H20DBVR is available at Aetrix Electronics and suitable for battery-powered instrumentation, automotive body electronics, and industrial control systems requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS3103H20DBVR 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 for industrial, automotive, and consumer markets.

TPS3103H20DBVR belongs to TI's precision voltage supervisor product line, engineered specifically for ultra-low-power, high-accuracy power-rail monitoring in energy-sensitive embedded systems.

FAQ

What is the exact VDD threshold voltage of the TPS3103H20DBVR and how tightly is it specified?

The TPS3103H20DBVR has a nominal VDD threshold of 2.0V, with a guaranteed range of 1.829V to 1.857V at 25°C and 1.829V to 1.857V over full temperature (–40°C to 125°C). This ±0.75% accuracy is factory-trimmed and does not require external calibration. The TPS3103H20DBVR achieves this stability using an internal bandgap-referenced voltage divider, ensuring consistent brownout detection across voltage and temperature variations.

Does the TPS3103H20DBVR include a watchdog timer function?

No, the TPS3103H20DBVR does not include a watchdog timer. It is a dedicated voltage supervisor with dual-comparator architecture (VDD and PFI), open-drain RESET and PFO outputs, and manual reset input. Watchdog functionality is exclusive to the TPS3110 series (e.g., TPS3110K33DBVR). The TPS3103H20DBVR focuses on static voltage monitoring and power-fail detection without software interaction requirements.

Can the TPS3103H20DBVR monitor a negative voltage such as –2V?

Yes, the TPS3103H20DBVR can monitor negative voltages using the PFI input with an external resistor network. As shown in Figure 7-4 of the datasheet, connecting a voltage divider between the negative rail and ground allows translation of the –2V signal into a positive voltage at PFI that crosses the 0.551V threshold. The TPS3103H20DBVR itself remains powered from a positive VDD supply (≥0.9V), and the PFI comparator operates independently of polarity - enabling robust low-battery or reverse-polarity detection.

What is the minimum VDD voltage required for the TPS3103H20DBVR to assert RESET reliably?

RESET is defined and functional down to VDD = 0.4V - meaning the TPS3103H20DBVR continues asserting active-low RESET even as the supply collapses below its 2.0V threshold, ensuring the host processor remains held in reset during deep brownout. Below 0.4V, internal circuitry may become undefined. This 0.4V specification is explicitly guaranteed in the datasheet and enables fail-safe behavior in battery-dead scenarios where other supervisors release reset prematurely.

How does the PFI input interact with the main RESET output in the TPS3103H20DBVR?

In the TPS3103H20DBVR, the PFI input and VDD input drive RESET independently via OR logic: RESET goes low if *either* VDD < 2.0V *or* PFI < 0.551V. PFO is a separate open-drain output reflecting only PFI status and does not affect RESET timing. This dual-trigger architecture allows the TPS3103H20DBVR to serve as both primary supply supervisor and auxiliary voltage monitor within a single chip - eliminating the need for discrete comparators while maintaining strict timing control over the main reset signal.