Texas Instruments TPS3110K33DBVT

Overview

TPS3110K33DBVT from Texas Instruments is an ultralow-supply-current voltage supervisor IC with integrated watchdog timer, designed for power-on reset and runtime supervision of microprocessors and DSPs. It features a fixed 3.3V VDD threshold (2.919–2.963V), 1.2μA typical supply current, 130ms reset delay, push-pull active-low RESET output, and WDI input for watchdog timeout detection (0.55–1.65s). It operates across –40°C to 125°C in battery-powered and industrial embedded systems.

For engineers reviewing the TPS3110K33DBVT datasheet, TPS3110K33DBVT pinout, TPS3110K33DBVT application, or TPS3110K33DBVT equivalent, key selection criteria include its 3.3V supervision accuracy (±0.75%), watchdog timing tolerance, push-pull output drive capability, SENSE input compatibility with 0.551V reference, and operation down to 0.4V VDD for early power-on assertion.

Technical Context

The TPS3110K33DBVT implements a dual-monitoring architecture: one comparator supervises VDD against a precision internal 3.3V threshold (VIT− = 2.941V typ), while a second comparator monitors the SENSE input against a fixed 0.551V reference. Its watchdog logic resets the system if the WDI input fails to toggle within 0.55–1.65s, with reset assertion sustained for the full 130ms delay period.

Reset assertion is controlled by OR-combining VDD undervoltage, SENSE undervoltage, and MR low states, followed by a deterministic 130ms power-on reset timer. The push-pull RESET output drives high without external pull-up and supports load currents up to ±5mA, enabling direct interface with µC reset inputs without additional components.

Key Specifications

Pinout & Package

TPS3110K33DBVT 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 TPS3110K33DBVT, TPS3839K33DBVR trades watchdog capability for 3.4× lower quiescent current, while MAX6315US33D3+ sacrifices accuracy and temperature range for broader distributor availability-neither offers pin-compatible replacement without circuit modification.

Availability

TPS3110K33DBVT is available at Aetrix Electronics and suitable for industrial PLCs, battery-powered IoT nodes, automotive body controllers, and medical handheld devices requiring stable component supply and long-term lifecycle support.

Supply support for TPS3110K33DBVT 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 expertise in high-reliability supervisory ICs.

The TPS31xx family was engineered specifically for robust power-on reset and runtime supervision in resource-constrained DSP and microcontroller systems, emphasizing ultralow current, precision thresholds, and integrated watchdog safety.

FAQ

What is the exact VDD threshold voltage range for TPS3110K33DBVT across temperature?

The TPS3110K33DBVT has a VDD threshold (VIT−) of 2.919V (min) to 2.963V (max) at 25°C, and 2.823V (min) to 3.058V (max) over the full –40°C to 125°C operating range. This ±0.75% accuracy is specified in Section 6.5 of the SLVS363H datasheet and reflects the device's precision internal voltage divider calibrated for 3.3V rail supervision.

Does TPS3110K33DBVT require an external pull-up resistor on the RESET pin?

No, TPS3110K33DBVT does not require an external pull-up resistor on the RESET pin because it features a push-pull output stage. The RESET pin actively drives high (to VDD) and low (to GND), eliminating reliance on external components for logic level definition-unlike open-drain alternatives such as the TPS3106K33DBVT.

Can TPS3110K33DBVT supervise a 1.5V core rail while monitoring a 3.3V I/O rail?

Yes, TPS3110K33DBVT can supervise both rails simultaneously: the VDD pin monitors the 3.3V I/O supply directly, while the SENSE pin monitors the 1.5V core rail via a resistor divider scaled to present 0.551V at SENSE when the core rail is at its minimum valid voltage-enabling independent reset assertion for either rail failure.

What is the watchdog timeout window for TPS3110K33DBVT, and how is it triggered?

The TPS3110K33DBVT watchdog timeout window is 0.55s (min) to 1.65s (max), triggered when the WDI pin remains static (no rising or falling edge) beyond this interval. Each valid edge clears the timer; assertion of RESET lasts for the full 130ms delay period, ensuring reliable recovery even if firmware fails to service the watchdog.

Is TPS3110K33DBVT qualified for automotive applications per AEC-Q100?

TPS3110K33DBVT is not AEC-Q100 qualified. It is rated for –40°C to 125°C operation and widely used in automotive-adjacent applications (e.g., cabin modules), but lacks formal AEC-Q100 Grade 1 or Grade 2 certification. For certified automotive use, TI recommends the TLV809x or TPS380x families with explicit AEC-Q100 qualification.