Texas Instruments TPS3103K33DBVT

Overview

TPS3103K33DBVT from Texas Instruments is an ultralow-quiescent-current voltage supervisor IC with fixed 3.3V VDD monitoring threshold, active-low open-drain RESET output, and integrated power-fail detection (PFI/PFO). It delivers 0.75% trip-point accuracy, 1.2μA typical supply current, and operates across –40°C to 125°C for reliable reset assertion in low-power microcontroller systems during brownout or startup.

For engineers reviewing the TPS3103K33DBVT datasheet, TPS3103K33DBVT pinout, TPS3103K33DBVT application, or TPS3103K33DBVT equivalent, key selection criteria include its 3.3V fixed VDD threshold, PFI input compatibility with 0.551V reference, 130ms reset delay, open-drain output drive capability, and SOT-23-6 package suitability for space-constrained battery-powered designs.

Technical Context

The TPS3103K33DBVT implements a precision bandgap-based comparator for VDD supervision and a separate 0.551V reference comparator for PFI input, both with 15mV hysteresis. Its internal 130ms power-on reset timer initiates only after VDD exceeds VIT– + VHYS (≥2.97V), ensuring stable release of RESET.

It features a manual reset (MR) input with internal 100kΩ pullup, enabling system-initiated reset independent of supply conditions. The open-drain RESET and PFO outputs support wired-OR configurations and level-shifting, while the device remains functional down to VDD = 0.4V for early fault detection.

Key Specifications

Pinout & Package

TPS3103K33DBVT 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, TPS3103K33DBVR offers identical functionality in volume packaging, while MAX6326LT33D2T trades PFI/PFO capability and tighter accuracy for push-pull output convenience and slightly higher quiescent current-making it suitable only for simpler, single-supply applications.

Availability

TPS3103K33DBVT is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial sensor nodes, and portable medical devices requiring stable component supply with guaranteed long-term availability and full traceability.

Supply support for TPS3103K33DBVT 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 personal electronics markets.

The TPS31xx family was designed specifically for ultra-low-power voltage supervision in battery-critical and thermally demanding applications, emphasizing precision threshold accuracy, nanoscale quiescent current, and extended temperature operation.

FAQ

What is the exact VDD threshold voltage for TPS3103K33DBVT?

The TPS3103K33DBVT has a nominal VDD threshold of 2.941V at 25°C, with guaranteed limits of 2.919V (min) and 2.963V (max) over temperature. This 3.3V-specific variant uses an internal precision voltage divider and achieves ±0.75% accuracy, eliminating need for external calibration components in 3.3V system designs.

Does TPS3103K33DBVT support monitoring a second voltage rail?

Yes, TPS3103K33DBVT includes a dedicated PFI (power-fail input) pin referenced to a 0.551V internal comparator. By connecting an external resistor divider from the secondary rail (e.g., 1.8V, 2.5V, or battery) to PFI, the device generates an independent PFO (power-fail output) signal-enabling concurrent supervision of main VDD and auxiliary supplies without affecting RESET timing.

What is the minimum VDD voltage at which TPS3103K33DBVT remains functional?

The TPS3103K33DBVT asserts RESET down to VDD = 0.4V and continues operating as a supervisor at that level. Its internal circuitry remains active and responsive to MR and PFI inputs even below 1.0V, making it uniquely suited for ultra-low-voltage wake-up scenarios and deep-brownout recovery in energy-harvesting and battery-depleted systems.

How does the manual reset (MR) pin behave on TPS3103K33DBVT?

The MR pin on TPS3103K33DBVT is an active-low input with an internal 100kΩ pullup resistor. When pulled low, it forces RESET low immediately and holds it for the full 130ms timeout period after MR returns high. If unused, MR may be left floating (relying on internal pullup) or tied to VDD; no external components are required for basic operation.

Is TPS3103K33DBVT compatible with lead-free reflow soldering processes?

Yes, TPS3103K33DBVT in the DBV (SOT-23-6) package is rated for standard lead-free reflow profiles per JEDEC J-STD-020. Its maximum peak temperature rating is 260°C, and thermal characteristics-including RθJA = 183.2°C/W-are validated for Pb-free assembly, ensuring reliability in modern RoHS-compliant manufacturing lines.