Texas Instruments TPS3103H20DBVT

Overview

TPS3103H20DBVT from Texas Instruments is an ultralow-supply-current voltage supervisor IC with fixed 2.0V V_IT– threshold, open-drain active-low RESET output, and integrated power-fail input (PFI)/output (PFO). It monitors VDD supply voltage down to 0.4V assertion level, delivers 1.2μA typical supply current, and provides 130ms reset delay time - enabling reliable power-on reset for low-power microcontrollers in battery-constrained systems.

For engineers reviewing the TPS3103H20DBVT datasheet, TPS3103H20DBVT pinout, TPS3103H20DBVT application, or TPS3103H20DBVT equivalent, key selection criteria include its ±0.75% trip-point accuracy over –40°C to 125°C, PFI/PFO capability for auxiliary voltage supervision, and SOT-23-6 package compatibility with space-constrained portable designs.

Technical Context

The TPS3103H20DBVT implements a precision bandgap-based voltage comparator with internal 2.0V threshold reference (V_IT– = 1.843V typ at 25°C, ±0.75% accuracy), hysteresis of 30mV, and propagation delay under 40μs. Its PFI input compares external voltages against a fixed 0.551V reference, driving the open-drain PFO output independently of RESET.

Power-on reset logic asserts RESET low when VDD exceeds 0.4V, holds it low until VDD rises above V_IT– + V_HYS, then initiates a 130ms timer before releasing RESET high - ensuring stable initialization of DSPs and MCUs without external timing components.

Key Specifications

Pinout & Package

TPS3103H20DBVT is housed in a 6-pin SOT-23 (DBV) package measuring 2.90mm × 2.80mm, 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 supervisor applications.

Compared with TPS3103K33DBVT, the TPS3103H20DBVT provides tighter alignment with 2.0V–2.5V microcontroller I/O rails; versus MAX6326XR29D3+T, it adds PFI/PFO and MR capability at the cost of two additional pins - justifying use where system-level power integrity diagnostics are required.

Availability

TPS3103H20DBVT is available at Aetrix Electronics and suitable for battery-powered instrumentation, portable medical devices, and industrial sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS3103H20DBVT 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 TPS31xx family was engineered specifically for low-power, high-accuracy voltage supervision in battery-constrained and thermally demanding embedded systems - emphasizing minimal quiescent current, wide temperature operation, and dual-rail monitoring capability.

FAQ

What is the exact V_IT– threshold voltage for TPS3103H20DBVT and how tightly is it specified?

The TPS3103H20DBVT has a nominal V_IT– threshold of 2.0V, with a guaranteed range of 1.829V to 1.857V at 25°C and 1.772V to 1.914V over the full –40°C to 125°C operating range. This ±0.75% accuracy at room temperature ensures predictable reset behavior without calibration, directly supporting design margin analysis for 2.0V supply rails.

Does TPS3103H20DBVT support monitoring of voltages other than its own VDD supply?

Yes, the TPS3103H20DBVT includes a dedicated PFI (power-fail input) pin that compares an external voltage to an internal 0.551V reference. When the PFI voltage drops below this threshold, the open-drain PFO output goes low - enabling independent supervision of auxiliary supplies like battery voltage or backup rails without affecting the primary RESET signal.

What is the minimum VDD voltage required for TPS3103H20DBVT to assert RESET reliably?

The TPS3103H20DBVT asserts RESET low when VDD rises above 0.4V, enabling robust power-on reset initiation even under weak or slowly ramping supply conditions. This low assertion level ensures compatibility with energy-harvesting sources and deeply discharged batteries where traditional supervisors may fail to activate.

How does the manual reset (MR) pin function on TPS3103H20DBVT and what is its default state?

The MR pin on TPS3103H20DBVT is an active-low input with an internal 100kΩ pullup resistor. Pulling MR low forces RESET low immediately and holds it for 130ms after MR returns high. When left unconnected, MR remains high due to the internal pullup, allowing normal VDD-based supervision without external components.

Is TPS3103H20DBVT compatible with 1.8V logic systems and what are its output drive capabilities?

Yes, the TPS3103H20DBVT operates from 0.9V to 3.6V and features open-drain RESET and PFO outputs. These outputs can be pulled up to any logic rail (e.g., 1.8V) independently of VDD, enabling seamless interface with mixed-voltage systems. Output leakage is ≤200nA at VOH, ensuring minimal loading on the pull-up network.