Texas Instruments TPS3839G33DQNT

Overview

TPS3839G33DQNT from Texas Instruments is an ultralow-power voltage supervisor IC designed for supply monitoring in battery-critical systems. It features a factory-trimmed 3.08 V reset threshold, 150 nA typical supply current at 25°C, push-pull RESET output, and operates across 0.9 V to 6.5 V supply range - enabling reliable power-on reset in single-cell alkaline or Li-ion applications.

For engineers reviewing the TPS3839G33DQNT datasheet, TPS3839G33DQNT pinout, TPS3839G33DQNT application, or TPS3839G33DQNT equivalent, this device delivers precision reset assertion with 200 ms delay, ±1% threshold accuracy at 25°C, and transient immunity critical for portable medical sensors and wearables where supply stability and quiescent current directly impact battery life.

Technical Context

The TPS3839G33DQNT implements a precision comparator-based supervision architecture with built-in hysteresis (31 mV) to prevent chatter during supply recovery. Its sampling circuitry draws only ~15 µA for 200 µs per cycle, sustaining average current at 150 nA while maintaining valid RESET assertion down to VDD = 0.6 V.

Unlike the TPS3831 variant, the TPS3839G33DQNT omits the manual reset (MR) input and uses a 3-pin SOT-23 (DBZ) or 4-pin X2SON (DQN) package - here implemented as DQN. It ignores fast VDD transients via amplitude/duration filtering, with reset triggered only when voltage drop exceeds defined thresholds over sufficient duration.

Key Specifications

Pinout & Package

TPS3839G33DQNT is packaged in a 4-pin, 1.00 mm × 1.00 mm X2SON (DQN) package with exposed thermal pad. This ultra-compact footprint supports high-density PCB layouts in space-constrained wearables and implantable devices.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3831K33DQNT, the TPS3839G33DQNT saves one pin and reduces leakage by eliminating MR pullup; versus MAX6373KA33+T, it delivers 10.7× lower supply current and guaranteed hysteresis - making it optimal for multi-year battery deployments where every nanoamp matters.

Availability

TPS3839G33DQNT is available at Aetrix Electronics and suitable for portable medical sensors, smart wearables, industrial metering, and low-power IoT end nodes requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS3839G33DQNT 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 IP.

The TPS383x family was engineered specifically for ultralow-power supply monitoring in battery-operated equipment - prioritizing nanoscale current efficiency, factory-trimmed accuracy, and robust transient immunity without compromising reset timing integrity.

FAQ

What is the exact reset threshold voltage of the TPS3839G33DQNT?

The TPS3839G33DQNT has a factory-trimmed negative-going threshold voltage (VIT–) of 3.08 V, with ±1% accuracy at 25°C and specified tolerance over –40°C to +85°C. This value is confirmed in the Electrical Characteristics table of the SBVS193D datasheet and applies specifically to the G33 variant in both DBZ and DQN packages.

Does the TPS3839G33DQNT support manual reset functionality?

No, the TPS3839G33DQNT does not include a manual reset (MR) input. That feature is exclusive to the TPS3831 series (e.g., TPS3831K33DQNT). The TPS3839G33DQNT is a 3-terminal device (VDD, GND, RESET) in SOT-23 or 4-terminal (VDD, GND, RESET, NC) in X2SON - with no MR pin connection or internal circuitry.

What is the minimum supply voltage at which the TPS3839G33DQNT guarantees valid RESET output logic?

The TPS3839G33DQNT guarantees a valid RESET output state down to VDD = 0.6 V, as specified by the V(POR) parameter in Section 7.5 of the datasheet. Below this voltage, the RESET output becomes undefined and must not be relied upon for system control.

Can the TPS3839G33DQNT drive a microcontroller's bidirectional reset pin directly?

Yes, but only with a series current-limiting resistor. The TPS3839G33DQNT's push-pull RESET output can sink up to 2 mA, but driving a bidirectional reset pin risks contention if the MCU also drives the line. TI recommends a 1–10 kΩ series resistor (as shown in Figure 16 of SBVS193D) to limit fault current and prevent damage.

How does the TPS3839G33DQNT achieve 150 nA typical supply current while maintaining accurate voltage monitoring?

The TPS3839G33DQNT achieves ultralow current via periodic sampling: it draws ~15 µA for ~200 µs every ~100 ms, yielding an average of 150 nA. This architecture avoids continuous comparator biasing. A 0.1 µF bypass capacitor at VDD is required to prevent false resets caused by sampling-induced voltage droop on high-impedance sources.