Texas Instruments TPS3103K33DBVTG4

Overview

TPS3103K33DBVTG4 from Texas Instruments is an ultralow-supply-current voltage supervisor IC with fixed 3.3V VDD threshold, open-drain active-low RESET output, and integrated power-fail detection (PFI/PFO). It delivers 0.75% trip-point accuracy, 1.2μA typical supply current, and operates from 0.9V to 3.6V supply across –40°C to 125°C. It is used for reliable power-on reset generation in battery-powered microcontroller systems.

For engineers reviewing the TPS3103K33DBVTG4 datasheet, TPS3103K33DBVTG4 pinout, TPS3103K33DBVTG4 application, or TPS3103K33DBVTG4 equivalent, this page provides verified functional identity, validated pin roles, confirmed electrical specifications, temperature-rated package data, and two technically documented alternative parts for low-power supervisory design.

Technical Context

The TPS3103K33DBVTG4 monitors its own VDD supply against a factory-trimmed 2.941V (typ) threshold with 50mV hysteresis and asserts open-drain RESET low until VDD exceeds VIT– + VHYS and remains stable for 130ms. Its PFI input compares external voltages to a 0.551V internal reference, driving PFO low when the monitored voltage falls below that threshold.

It features a manual reset (MR) input with internal 100kΩ pullup, enabling system-initiated reset independent of supply conditions. All logic is fully specified down to VDD = 0.4V, supporting ultra-low-voltage initialization in energy-constrained applications.

Key Specifications

Pinout & Package

SOT-23-6 (DBV) package: 2.90mm × 2.80mm footprint, 1.45mm height, lead pitch 0.95mm, RoHS-compliant, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar voltage supervision applications.

Compared with TPS3103K33DBVTG4, the DBVR variant offers identical performance in bulk packaging, while MAX6326LT33D3+ trades PFI functionality and open-drain drive for push-pull output and slightly higher current draw-making it viable only in single-rail, high-volume applications where PFI is unused.

Availability

TPS3103K33DBVTG4 is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial control modules, and automotive body electronics requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TPS3103K33DBVTG4 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 specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in precision analog ICs.

The TPS31xx family was designed specifically for ultra-low-power, high-accuracy voltage supervision in space-constrained, battery-sensitive applications such as portable medical devices and remote IoT endpoints.

FAQ

What is the exact VDD threshold voltage of the TPS3103K33DBVTG4?

The TPS3103K33DBVTG4 has a nominal VDD threshold (VIT–) of 2.941V at 25°C, with guaranteed limits of 2.919V (min) and 2.963V (max) per the datasheet. Over the full –40°C to 125°C range, the threshold remains within 2.823V to 3.058V, maintaining ±0.75% accuracy relative to nominal. This value is factory-trimmed and does not require external calibration. The TPS3103K33DBVTG4 uses an internal voltage divider to set this fixed threshold.

Does the TPS3103K33DBVTG4 support monitoring a second voltage rail?

Yes, the TPS3103K33DBVTG4 includes a dedicated PFI (power-fail input) pin that compares an external voltage to a precise 0.551V internal reference. When the PFI voltage falls below this threshold, the open-drain PFO output goes low-fully independent of the VDD supervision path. This enables dual-rail monitoring (e.g., main 3.3V and backup battery) without additional ICs. The TPS3103K33DBVTG4 datasheet specifies PFI hysteresis of 15mV and operating validity when VDD ≥ 0.8V.

What is the minimum VDD voltage required for the TPS3103K33DBVTG4 to assert RESET?

The TPS3103K33DBVTG4 asserts RESET low when VDD rises above 0.4V, enabling early-fail detection during power ramp-up. This behavior is guaranteed across temperature and process corners. Once VDD exceeds the 2.941V threshold and remains stable for 130ms, RESET deasserts. If VDD subsequently drops below 2.919V, RESET reasserts immediately. The TPS3103K33DBVTG4 maintains functional MR and PFI monitoring down to VDD = 0.4V, making it suitable for ultra-low-voltage brownout detection.

Can the TPS3103K33DBVTG4 be used in automotive applications?

Yes, the TPS3103K33DBVTG4 is characterized for operation from –40°C to 125°C and packaged in an industry-standard SOT-23-6 (DBV) housing, meeting key requirements for under-hood and body-control automotive applications. Its 0.75% threshold accuracy, 50mV hysteresis, and robust MR/PFI inputs provide noise immunity in electrically harsh environments. While not AEC-Q200 certified out-of-box, the TPS3103K33DBVTG4 is widely deployed in automotive subsystems where extended temperature range and reliability are critical-such as door modules and lighting controllers.

What is the function of the MR pin on the TPS3103K33DBVTG4?

The MR (manual reset) pin on the TPS3103K33DBVTG4 is an active-low input with an internal 100kΩ pullup resistor. Driving MR low forces RESET low regardless of VDD or PFI status, and RESET remains low for the full 130ms timeout period after MR returns high. This enables hardware-initiated system reset via pushbutton or logic signal. The TPS3103K33DBVTG4 MR input is fully specified from 0V to VDD and requires no external components-though a 0.1μF capacitor to GND is recommended in noisy environments for added immunity.