Texas Instruments TPS3103E15DBVTG4

Overview

TPS3103E15DBVTG4 from Texas Instruments is an ultralow-quiescent-current voltage supervisor IC with fixed 1.5V V_IT– threshold, open-drain active-low RESET output, and integrated PFI/PFO for secondary supply monitoring. It operates from 0.9V to 3.6V, draws only 1.2μA typical supply current, asserts RESET down to 0.4V VDD, and provides 130ms power-on reset delay - enabling reliable initialization in battery-powered microcontroller systems.

For engineers reviewing the TPS3103E15DBVTG4 datasheet, TPS3103E15DBVTG4 pinout, TPS3103E15DBVTG4 application, or TPS3103E15DBVTG4 equivalent, key selection criteria include its 0.75% trip-point accuracy, –40°C to 125°C operating range, SOT-23-6 package compatibility, and dual-supply supervision capability via PFI input referenced to 0.551V.

Technical Context

The TPS3103E15DBVTG4 implements a precision bandgap-based voltage comparator with internal 1.5V threshold (V_IT– = 1.434V typ at 25°C, ±0.75% tolerance), 20mV hysteresis, and a 130ms internal reset timer. Its PFI input compares external voltages against a stable 0.551V reference, driving the open-drain PFO output independently of the main RESET signal.

It features manual reset (MR) with internal 100kΩ pullup, operates with VDD as low as 0.4V for RESET assertion, and maintains functional integrity across full industrial temperature range (–40°C to 125°C) without requiring external components for basic supervision.

Key Specifications

Pinout & Package

TPS3103E15DBVTG4 is housed in a 6-pin SOT-23 (DBV) package with gull-wing leads, optimized for automated assembly and thermal performance (R_θJA = 183.2°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3103E15DBVTG4, TPS3103E15DBVR offers identical performance in volume-optimized packaging, while MAX6326LT15D3+T trades dual-rail capability and lower quiescent current for smaller footprint and longer reset timeout - making it suitable only where PFI functionality is unnecessary.

Availability

TPS3103E15DBVTG4 is available at Aetrix Electronics and suitable for battery-powered microcontrollers, low-voltage industrial sensors, portable medical devices, and automotive body control modules requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TPS3103E15DBVTG4 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, with over 90 years of innovation in power management, signal chain, and microcontroller technologies.

The TPS31xx family was designed specifically for ultralow-power voltage supervision in space-constrained, battery-operated systems - emphasizing precision threshold accuracy, nanoscale quiescent current, and dual-rail monitoring capability for modern embedded applications.

FAQ

What is the exact V_IT– threshold voltage for TPS3103E15DBVTG4 and how tightly is it specified?

The TPS3103E15DBVTG4 has a nominal V_IT– threshold of 1.5V, with a guaranteed range of 1.423V to 1.445V at 25°C and 1.362V to 1.505V across –40°C to 125°C. This ±0.75% accuracy at room temperature and ±4.5% over temperature ensures robust 1.5V rail supervision without design margining. The TPS3103E15DBVTG4 achieves this via laser-trimmed internal resistors and a stable bandgap reference.

Does TPS3103E15DBVTG4 support monitoring a second voltage rail, and if so, how is it implemented?

Yes, the TPS3103E15DBVTG4 supports secondary rail monitoring via its dedicated PFI (power-fail input) pin, which compares an external voltage to an internal 0.551V reference. When the divided-down auxiliary rail voltage falls below this threshold, the open-drain PFO output goes low - independently of the main RESET signal. This allows the TPS3103E15DBVTG4 to supervise both its own VDD (1.5V) and another rail (e.g., 3.3V battery) simultaneously.

What is the minimum VDD voltage at which TPS3103E15DBVTG4 can assert RESET, and why does this matter?

The TPS3103E15DBVTG4 asserts RESET when VDD rises above 0.4V - significantly lower than most supervisors requiring ≥0.8V. This enables deterministic reset signaling during ultra-low-voltage startup (e.g., cold lithium battery conditions) and ensures the system remains held in reset until sufficient supply headroom exists for reliable logic operation. For TPS3103E15DBVTG4, this feature is critical in energy-harvesting and coin-cell applications.

How does the manual reset (MR) pin function on TPS3103E15DBVTG4, and what external components are required?

The MR pin on TPS3103E15DBVTG4 is an active-low input with an internal 100kΩ pullup resistor, allowing direct connection to a momentary switch (to GND) without external components. When pulled low, it forces RESET low immediately and holds it for the full 130ms timeout after release. No external pullup or debounce capacitor is required, though a 0.1μF capacitor to GND is recommended in noisy environments. This simplifies hardware design while maintaining full reset control for TPS3103E15DBVTG4.

What package type and thermal characteristics apply to TPS3103E15DBVTG4, and how do they impact PCB layout?

The TPS3103E15DBVTG4 uses a 6-pin SOT-23 (DBV) package measuring 2.90mm × 2.80mm. Its junction-to-ambient thermal resistance is 183.2°C/W, and it requires a 0.1μF ceramic decoupling capacitor placed adjacent to the VDD pin. To prevent supply ringing, avoid long traces between VDD and the capacitor - the TPS3103E15DBVTG4's low power consumption minimizes self-heating, but proper layout ensures stable reference accuracy and noise immunity.