Texas Instruments TPS3110E15DBVR

Overview

TPS3110E15DBVR from Texas Instruments is an ultralow-quiescent-current voltage supervisor IC with integrated watchdog timer, designed for power-on reset and runtime supervision of microprocessors in battery-constrained systems. It features a fixed 1.434 V (±0.75%) VDD threshold, 1.2 μA typical supply current, 130 ms reset delay, push-pull active-low RESET output, and operates across –40°C to 125°C.

For engineers reviewing the TPS3110E15DBVR datasheet, TPS3110E15DBVR pinout, TPS3110E15DBVR application, or TPS3110E15DBVR equivalent, this page delivers verified functional identity, exact pin roles, confirmed watchdog timing (1.1 s timeout), thermal specs (RθJA = 183.2°C/W), and two validated alternative parts for low-power processor reset supervision.

Technical Context

The TPS3110E15DBVR implements a precision bandgap-based voltage reference and comparator architecture to monitor VDD against a factory-trimmed 1.434 V threshold with ±0.75% accuracy over temperature. Its internal 130 ms power-on reset timer initiates only after VDD exceeds VIT– + VHYS (≥1.454 V), ensuring stable release.

A dedicated WDI input accepts rising/falling edges to clear a 1.1 s watchdog timer; failure to retrigger within that window forces RESET assertion. The push-pull RESET output drives loads up to 5 mA while maintaining VOL ≤ 0.3 V at IOL = 3 mA and VOH ≥ 0.8×VDD at IOH = –3 mA.

Key Specifications

Pinout & Package

TPS3110E15DBVR is housed in a 6-pin SOT-23 (DBV) package with 0.95 mm pitch, optimized for thermal performance (RθJA = 183.2°C/W) and space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3110E15DBVR, TPS3110E12DBVR offers direct pin compatibility with adjusted threshold for 1.2 V systems, while TPS3823-15DBVR trades watchdog capability and ultra-low current for simpler interface and broader distributor availability.

Availability

TPS3110E15DBVR is available at Aetrix Electronics and suitable for battery-powered IoT nodes, DSP-based motor controllers, industrial PLC I/O modules, and automotive telematics units requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TPS3110E15DBVR 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 supervisory circuits.

The TPS31xx family was engineered specifically for low-power, high-accuracy reset supervision in microcontroller and DSP systems-emphasizing nanoscale quiescent current, tight threshold tolerance, and integrated watchdog functionality.

FAQ

What is the exact VDD threshold voltage of the TPS3110E15DBVR?

The TPS3110E15DBVR has a factory-trimmed negative-going input threshold voltage (VIT–) of 1.434 V (typical) at 25°C, with guaranteed limits of 1.423 V (min) and 1.445 V (max). Over the full –40°C to 125°C operating range, VIT– remains within 1.362 V to 1.505 V, meeting ±0.75% accuracy specification. This precise threshold enables reliable supervision of 1.5 V supply rails in portable and industrial systems.

Does the TPS3110E15DBVR require an external pull-up resistor on the RESET pin?

No, the TPS3110E15DBVR features an active-low push-pull RESET output, eliminating the need for an external pull-up resistor. Its output stage can sink up to 5 mA while maintaining VOL ≤ 0.3 V at IOL = 3 mA and drive VOH ≥ 0.8×VDD at IOH = –3 mA. This simplifies PCB layout, reduces BOM count, and improves noise immunity compared to open-drain alternatives like the TPS3106 series.

How does the watchdog timer function on the TPS3110E15DBVR?

The TPS3110E15DBVR watchdog timer is triggered by any rising or falling edge on the WDI pin. If no edge occurs within 1.1 s (typical), RESET is asserted for the standard 130 ms delay period. The timer resets on each valid edge or when RESET is actively driven low. This behavior enables robust detection of firmware hangs in microprocessors without requiring dedicated timer peripherals or complex software polling routines.

Can the TPS3110E15DBVR monitor a secondary voltage rail such as a 1.5 V core supply?

Yes, the TPS3110E15DBVR includes a dedicated SENSE input referenced to an internal 0.551 V comparator. To supervise a 1.5 V rail, connect it to SENSE through a resistor divider (e.g., R1 = 820 kΩ, R2 = 430 kΩ) that scales the voltage to 0.551 V at trip point. The SENSE signal is OR-wired with VDD and MR inputs, so a fault on either rail triggers RESET-enabling comprehensive multi-rail supervision in a single IC.

What is the maximum operating supply voltage for the TPS3110E15DBVR?

The TPS3110E15DBVR supports a recommended operating supply voltage (VDD) range of 0.9 V to 3.6 V. Absolute maximum rating is 4 V, but continuous operation above 3.6 V is not allowed per datasheet specifications. For reliable long-term operation, VDD must remain within 0.9 V–3.6 V across all conditions-including startup, load transients, and temperature extremes-to ensure proper reset timing, threshold accuracy, and watchdog functionality.