Texas Instruments TPS3103K33DBVRG4

Overview

TPS3103K33DBVRG4 from Texas Instruments is an ultralow-quiescent-current voltage supervisor IC with fixed 3.3V VDD threshold, active-low open-drain 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 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 TPS3103K33DBVRG4 datasheet, TPS3103K33DBVRG4 pinout, TPS3103K33DBVRG4 application, or TPS3103K33DBVRG4 equivalent, this page provides verified functional identity, confirmed SOT-23-6 pin mapping, exact trip-point accuracy (±0.75%), validated PFI comparator reference (0.551V), and real-world timing behavior including MR-triggered reset hold time and VDD-to-RESET propagation delay.

Technical Context

The TPS3103K33DBVRG4 implements a dual-comparator architecture: one monitors VDD against a factory-trimmed 2.941V (typ) threshold with 50mV hysteresis, while a second compares PFI against a fixed 0.551V internal reference. Its reset logic asserts active-low RESET when either VDD falls below VIT– or PFI drops below its threshold - independent of each other - with no interaction between the two supervision paths.

It features a dedicated open-drain PFO output synchronized to PFI transitions, a manual reset input with internal 100kΩ pullup, and guaranteed operation across –40°C to 125°C. The device requires no external components for basic supervision and supports noise-immune reset initiation via MR debounced by optional 0.1μF capacitor to GND.

Key Specifications

Pinout & Package

TPS3103K33DBVRG4 is housed in a 6-pin SOT-23 (DBV) package measuring 2.90mm × 2.80mm, optimized for space-constrained PCB layouts and compatible with standard pick-and-place assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3103K33DBVRG4, TPS3106K33DBVR offers rail-specific reset outputs but removes power-fail signaling, while TLV803EB33DBVR reduces supervision capability to VDD-only with looser accuracy and higher current - making TPS3103K33DBVRG4 optimal for dual-path, ultra-low-power, precision brownout detection.

Availability

TPS3103K33DBVRG4 is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, wireless edge node gateways, and automotive body control units requiring stable component supply with long-term lifecycle assurance.

Supply support for TPS3103K33DBVRG4 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 decades of experience in high-reliability industrial and automotive IC design.

The TPS31xx family was engineered specifically for ultra-low-power, precision voltage supervision in battery-critical and thermally demanding applications - delivering sub-2μA operation, factory-trimmed thresholds, and dual-comparator independence in compact SOT-23 packages.

FAQ

What is the exact VDD threshold voltage for TPS3103K33DBVRG4, and how tightly is it specified?

The TPS3103K33DBVRG4 has a nominal VDD threshold (VIT–) of 2.941V at 25°C, with a maximum deviation of ±0.75% across temperature and process variation. This corresponds to a guaranteed range of 2.823V to 3.058V over –40°C to 125°C, as confirmed in Section 6.5 of the SLVS363H datasheet. The value is factory-trimmed and does not require external calibration.

Does TPS3103K33DBVRG4 support monitoring a second voltage rail, and if so, how?

Yes, TPS3103K33DBVRG4 supports secondary voltage monitoring via its PFI (power-fail input) pin, which compares an externally divided voltage against a fixed 0.551V internal reference. When the divided voltage drops below this threshold, the open-drain PFO output goes low - independent of VDD status - enabling simultaneous supervision of main and auxiliary supplies without additional ICs.

What is the minimum VDD voltage at which TPS3103K33DBVRG4 can assert RESET, and why does that matter?

TPS3103K33DBVRG4 asserts RESET as long as VDD remains above 0.4V, per the datasheet's "RESET Defined With Input Voltages as Low as 0.4V" specification. This ensures deterministic reset behavior during deep brownout or battery exhaustion, preventing logic glitches or memory corruption in microcontrollers that may retain partial functionality below 1.0V.

Can the manual reset (MR) pin of TPS3103K33DBVRG4 be left unconnected, and what happens if it is?

Yes, the MR pin of TPS3103K33DBVRG4 can be left unconnected because it features an internal 100kΩ pullup resistor to VDD. In that state, MR remains logic-high and does not affect RESET operation. If external noise immunity is required, a 0.1μF capacitor from MR to GND is recommended - but no external pullup is necessary for basic functionality.

How does the power-on reset delay work in TPS3103K33DBVRG4, and is it adjustable?

The TPS3103K33DBVRG4 provides a fixed 130ms (typical) power-on reset delay (tD) that begins once VDD rises above the threshold plus hysteresis (VIT– + VHYS). This delay is internally generated and non-adjustable - ensuring consistent release timing across units and temperatures without external RC components, simplifying design and improving reliability.