Texas Instruments TPS3103E15DBVRG4

Overview

TPS3103E15DBVRG4 from Texas Instruments is an ultralow-supply-current voltage supervisor IC with fixed 1.5V V_IT– threshold, open-drain active-low RESET output, and integrated PFI/PFO for auxiliary voltage monitoring. It operates from 0.9V to 3.6V supply, draws only 1.2μA typical current, asserts RESET down to 0.4V V_DD, 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 TPS3103E15DBVRG4 datasheet, TPS3103E15DBVRG4 pinout, TPS3103E15DBVRG4 application, or TPS3103E15DBVRG4 equivalent, key selection criteria include its 1.434V nominal trip point (±0.75% accuracy), –40°C to 125°C operating range, SOT-23-6 package, PFI input referenced to 0.551V, and compatibility with low-voltage DSPs and portable instrumentation where supply current and reset timing stability are critical.

Technical Context

The TPS3103E15DBVRG4 implements a precision bandgap-based voltage comparator with internal 1.5V threshold (V_IT– = 1.434V typ.) and 20mV hysteresis for noise immunity. Its RESET assertion logic is triggered when V_DD falls below V_IT– or when PFI drops below 0.551V, with independent open-drain outputs for both functions.

It features a manual reset (MR) input with internal 100kΩ pullup, supports operation down to 0.4V V_DD, and includes thermal characterization for 125°C junction operation. No watchdog timer or SENSE input is present - distinguishing it from TPS3106/TPS3110 variants.

Key Specifications

Pinout & Package

TPS3103E15DBVRG4 is housed in a 6-pin SOT-23 (DBV) package measuring 2.90mm × 2.80mm, optimized for space-constrained PCB layouts and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3103E15DBVRG4, TPS3103E15DBVT offers identical performance in tape-and-reel format for volume manufacturing, while MAX6326LT15D2T trades PFI capability for push-pull drive strength - making the former ideal for cost-sensitive production and the latter suitable for simplified single-rail designs.

Availability

TPS3103E15DBVRG4 is available at Aetrix Electronics and suitable for battery-powered microcontrollers, low-voltage DSPs, and intelligent industrial sensors requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TPS3103E15DBVRG4 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 precision, low-power voltage supervision in processor-based systems - emphasizing ultra-low current, wide supply range, and dual-rail monitoring capability for portable and harsh-environment applications.

FAQ

What is the exact V_IT– threshold voltage of the TPS3103E15DBVRG4?

The TPS3103E15DBVRG4 has a nominal V_IT– threshold of 1.434V at 25°C, with guaranteed limits of 1.423V (min) and 1.445V (max). Over the full –40°C to 125°C range, the threshold varies from 1.362V to 1.505V, and its temperature coefficient is –0.012%/K. This fixed 1.5V-grade threshold eliminates external resistor networks and simplifies design validation for 1.5V supply rails.

Does the TPS3103E15DBVRG4 include a watchdog timer function?

No, the TPS3103E15DBVRG4 does not include a watchdog timer. It belongs to the TPS3103 subfamily, which provides only V_DD supervision and PFI/PFO monitoring. Watchdog functionality is exclusive to the TPS3110 variant (e.g., TPS3110K33DBVR). The TPS3103E15DBVRG4 relies solely on voltage thresholds and MR input for reset control - making it suitable for applications where software-level watchdog oversight is handled externally.

How does the PFI input on the TPS3103E15DBVRG4 operate?

The PFI input on the TPS3103E15DBVRG4 compares an external voltage to an internal 0.551V reference. When the applied voltage falls below this threshold, the open-drain PFO output pulls low. PFI operation requires V_DD ≥ 0.8V and introduces no delay in assertion. For monitoring voltages above 0.551V (e.g., 3.3V battery), a resistor divider scales the input - with R1+R2 ≈ 1MΩ and ≤1% resistor tolerance recommended to maintain accuracy and minimize current draw.

What is the minimum V_DD required for the TPS3103E15DBVRG4 to assert RESET?

The TPS3103E15DBVRG4 can assert RESET with V_DD as low as 0.4V - enabling reliable detection of deep brownout conditions before complete power collapse. Below 0.4V, internal circuitry becomes nonfunctional and RESET behavior is undefined. This capability is critical for energy-harvesting and ultra-low-power systems where residual voltage must trigger controlled shutdown prior to data loss.

Is the TPS3103E15DBVRG4 pin-compatible with other TPS31xx devices?

The TPS3103E15DBVRG4 shares the same SOT-23-6 (DBV) package and pinout with TPS3106 and TPS3110 variants, but functional pin assignments differ: TPS3103 uses PFI/PFO on Pins 4/5, while TPS3106 uses SENSE/RSTSENSE and TPS3110 uses SENSE/WDI. Direct substitution is not possible without schematic and firmware review - especially due to absence of watchdog (WDI) and dedicated sense output (RSTSENSE) in the TPS3103E15DBVRG4.