Texas Instruments TPS3831K33DQNT

Overview

TPS3831K33DQNT from Texas Instruments is an ultralow-power voltage supervisor IC designed to monitor 3.3-V supply rails in battery-critical systems. It features a factory-trimmed 2.93-V reset threshold, 150-nA typical supply current, push-pull RESET output, and operates across –40°C to +85°C. It asserts active-low reset during VDD drop below threshold and holds reset for 200 ms after recovery - used in glucose monitors and wearables requiring long battery life.

For engineers reviewing the TPS3831K33DQNT datasheet, TPS3831K33DQNT pinout, TPS3831K33DQNT application, or TPS3831K33DQNT equivalent, key selection criteria include valid reset operation down to 0.6 V, manual reset (MR) input support, 29-mV hysteresis, transient rejection capability, and X2SON-4 package compatibility with high-density portable layouts.

Technical Context

The TPS3831K33DQNT implements a precision comparator-based supervision architecture with internal hysteresis (29 mV) and a dedicated manual reset (MR) input that forces RESET low independently of VDD level. Its sampling scheme draws only ~15 µA for 200 µs per cycle, enabling stable 150-nA average current.

It supports bidirectional reset line interfacing via external series resistor and rejects fast transients on VDD based on amplitude/duration thresholds - critical for alkaline-battery-powered devices where supply droop occurs during load switching.

Key Specifications

Pinout & Package

TPS3831K33DQNT uses a 4-pin, 1.00 mm × 1.00 mm X2SON (DQN) package with exposed thermal pad. Pin 1 = VDD, Pin 2 = GND, Pin 3 = RESET, Pin 4 = MR. The thermal pad must be connected to ground for mechanical stability and thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3831K33DQNT, TPS3839K33DQNR removes MR functionality to reduce pin count and cost, while MAX6373KSA+T trades 8× higher supply current for broader vendor qualification - making TPS3831K33DQNT optimal for new designs prioritizing battery longevity and flexible reset control.

Availability

TPS3831K33DQNT is available at Aetrix Electronics and suitable for portable medical devices, industrial metering, and wearable electronics requiring stable component supply with long-term lifecycle assurance.

Supply support for TPS3831K33DQNT 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 company delivering analog and embedded processing solutions, with leadership in low-power design and precision analog ICs.

The TPS383x product line was developed specifically for ultralow-power voltage supervision in battery-constrained applications such as glucose monitors, wearables, and smart meters - emphasizing sub-µA operation and robust threshold accuracy.

FAQ

What is the factory-trimmed reset threshold voltage of the TPS3831K33DQNT?

The TPS3831K33DQNT has a factory-trimmed negative-going threshold voltage (VIT–) of 2.93 V, with ±1% accuracy at 25°C and 29 mV hysteresis. This value is laser-trimmed during production and confirmed in the Electrical Characteristics table of the SBVS193D datasheet. The TPS3831K33DQNT maintains this precise threshold across its full operating temperature range of –40°C to +85°C.

Does the TPS3831K33DQNT support manual reset functionality?

Yes, the TPS3831K33DQNT includes a dedicated manual reset (MR) input on Pin 4. Pulling MR low (≤0.3×VDD) forces the RESET output low regardless of VDD level. After MR is released, RESET deasserts only after the 200-ms delay elapses - provided VDD remains above 2.93 V. An internal 20-kΩ pullup resistor allows MR to float if unused.

What is the minimum supply voltage at which the TPS3831K33DQNT guarantees valid RESET output logic?

The TPS3831K33DQNT guarantees valid RESET output logic down to 0.6 V VDD, as specified by the V(POR) parameter in the datasheet. Below this voltage, the RESET output becomes undefined. This feature ensures deterministic reset behavior during deep brownout conditions common in end-of-life battery operation - a key requirement for TPS3831K33DQNT in medical and portable applications.

What package type and dimensions does the TPS3831K33DQNT use?

The TPS3831K33DQNT uses the X2SON-4 (DQN) package: a 4-pin, 1.00 mm × 1.00 mm body with 0.5-mm pitch and exposed thermal pad. This compact, leadless package supports high-density PCB layouts and requires reflow soldering per Level-1-260°C moisture sensitivity rating. Pin 1 = VDD, Pin 2 = GND, Pin 3 = RESET, Pin 4 = MR - verified in the Pin Configuration and Functions section of SBVS193D.

How does the TPS3831K33DQNT reject fast transients on the VDD pin?

The TPS3831K33DQNT rejects fast transients via internal timing and amplitude discrimination. As shown in Figure 13 of SBVS193D, it ignores VDD dips shorter than ~20 µs or shallower than ~2.857 V (i.e., <2.93 V – 29 mV hysteresis). This prevents false resets during switching noise or load-step events - a core design feature validated across –40°C to +85°C and critical for TPS3831K33DQNT reliability in portable equipment.