Texas Instruments TPS3103E12DBVT

Overview

TPS3103E12DBVT from Texas Instruments is an ultralow-supply-current voltage supervisor IC with fixed 1.2 V reset threshold, open-drain active-low RESET output, and integrated power-fail detection (PFI/PFO). It monitors VDD supply voltage in low-power microcontroller systems, asserts RESET when VDD drops below 1.142 V (typ), and draws only 1.2 μA typical supply current at VDD < 1.8 V. It operates across –40°C to 125°C and supports manual reset via MR pin.

For engineers reviewing the TPS3103E12DBVT datasheet, TPS3103E12DBVT pinout, TPS3103E12DBVT application, or TPS3103E12DBVT equivalent, key selection criteria include its 0.75% trip-point accuracy, 130 ms power-on reset delay, ability to define RESET down to 0.4 V VDD, and compatibility with battery-powered DSP/microcontroller power rails requiring precise, low-quiescent supervision.

Technical Context

The TPS3103E12DBVT implements a precision bandgap-based voltage reference and comparator architecture to monitor VDD against a factory-trimmed 1.2 V threshold (VIT– = 1.142 V typ, ±0.75%). Its internal timer initiates a 130 ms delay after VDD exceeds VIT– + VHYS before releasing RESET, ensuring stable power-up sequencing.

It features dual independent supervision paths: one for VDD (driving open-drain RESET) and another for external PFI input (comparing to 0.551 V reference, driving open-drain PFO). Both paths include 20 mV hysteresis and operate with VDD ≥ 0.8 V. The MR pin provides asynchronous reset override with internal 100 kΩ pullup.

Key Specifications

Pinout & Package

TPS3103E12DBVT is housed in a 6-pin SOT-23 (DBV) package measuring 2.90 mm × 2.80 mm, optimized for space-constrained PCB layouts in portable and industrial electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3103E12DBVT, TPS3103E15DBVT provides identical supervision architecture at a higher threshold for 1.5 V rails, while TPS3808G12DBVR trades integrated PFI for adjustable threshold capability-making it suitable for custom voltage monitoring where fixed 1.2 V is insufficient.

Availability

TPS3103E12DBVT is available at Aetrix Electronics and suitable for portable medical devices, industrial PLC modules, automotive body controllers, and battery-powered IoT edge nodes requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS3103E12DBVT 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.

The TPS31xx family is designed specifically for ultralow-power voltage supervision in battery-critical and thermally demanding applications, emphasizing precision threshold accuracy, sub-μA quiescent current, and extended temperature resilience.

FAQ

What is the exact reset threshold voltage of the TPS3103E12DBVT?

The TPS3103E12DBVT has a factory-trimmed negative-going input threshold voltage (V_IT–) of 1.142 V (typical), with a tolerance of ±0.75% over temperature. At –40°C to 125°C, the guaranteed range is 1.084 V to 1.199 V. This value applies specifically to the VDD input and defines the voltage below which the RESET output is asserted.

Does the TPS3103E12DBVT support monitoring an external voltage rail in addition to VDD?

Yes, the TPS3103E12DBVT includes a dedicated PFI (power-fail input) pin that compares an external voltage to a 0.551 V internal reference. When the PFI voltage falls below this threshold, the open-drain PFO output goes low. This function operates independently of the VDD supervision path and enables dual-rail monitoring without additional components.

What is the power-on reset delay time for the TPS3103E12DBVT?

The TPS3103E12DBVT provides a fixed 130 ms (typical) power-on reset delay after VDD rises above the threshold plus hysteresis. This delay begins once VDD exceeds V_IT– + V_HYS and ensures the system remains held in reset long enough for microcontroller clocks and peripherals to stabilize before release.

Can the TPS3103E12DBVT operate with supply voltages below 1.2 V?

Yes, the TPS3103E12DBVT functions with VDD as low as 0.4 V, enabling RESET assertion during deep brown-out conditions. Its internal circuitry remains operational down to this level, and the RESET output is defined even at 0.4 V. However, for PFI functionality, VDD must be ≥ 0.8 V per datasheet specifications.

Is the MR pin of the TPS3103E12DBVT internally pulled up, and what is the resistance value?

Yes, the MR pin of the TPS3103E12DBVT features an internal pullup resistor to VDD with a nominal value of 100 kΩ (range: 70–130 kΩ). This allows direct connection of a momentary switch to GND without external components, and the pin can be left floating if unused-ensuring MR remains inactive by default.