Texas Instruments TPS3839A09DQNT

Overview

TPS3839A09DQNT from Texas Instruments is an ultralow-power voltage supervisor IC designed to monitor single-supply rails in battery-critical systems. It features a factory-trimmed 0.9 V reset threshold, 150 nA typical supply current at 25°C, push-pull RESET output, and valid operation down to 0.6 V VDD - enabling reliable power-on reset for single-cell alkaline or LiSOCl₂ applications.

For engineers reviewing the TPS3839A09DQNT datasheet, TPS3839A09DQNT pinout, TPS3839A09DQNT application, or TPS3839A09DQNT equivalent, this page delivers verified specifications, X2SON-4 package mapping, thermal performance data, transient rejection behavior, and direct alternatives for low-voltage supervisory design.

Technical Context

The TPS3839A09DQNT implements a precision comparator with hysteresis (54 mV typical) and internal sampling circuitry that draws only ~15 µA for 200 µs during each measurement cycle - sustaining average quiescent current at 150 nA. Its reset delay is fixed at 200 ms (typical) after VDD rises above VIT– + Vhys.

Unlike the TPS3831 family, the TPS3839A09DQNT omits the manual reset (MR) input and uses a 3-pin functional configuration within its 4-pin X2SON package (Pin 3 is NC). It rejects fast transients on VDD via amplitude/duration thresholds defined in Figure 13 of SBVS193D.

Key Specifications

Pinout & Package

TPS3839A09DQNT is housed in a 1.00 mm × 1.00 mm, 4-pin X2SON (DQN) package with exposed thermal pad. Pin 3 is no-connect (NC); functional terminals are VDD (Pin 4), GND (Pin 3), and RESET (Pin 1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3831A09DQNT, the TPS3839A09DQNT removes MR functionality to reduce complexity and cost, while retaining identical threshold accuracy and ultra-low current. Against MAX6375XR29+T, it offers 10× lower IQ and 2.3× tighter threshold tolerance - making it the sole viable option for long-life, single-cell alkaline supervision.

Availability

TPS3839A09DQNT is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, wearable fitness trackers, and low-power IoT edge nodes requiring stable component supply across extended product lifecycles.

Supply support for TPS3839A09DQNT 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, precision analog, and high-reliability industrial components.

The TPS383x product line was engineered specifically for ultralow-power voltage supervision in battery-constrained applications - prioritizing sub-1-V operation, nanoamp quiescent current, and robust transient immunity over feature bloat.

FAQ

What is the exact reset threshold voltage of the TPS3839A09DQNT?

The TPS3839A09DQNT has a factory-trimmed negative-going threshold voltage (VIT–) of 0.9 V with ±1% accuracy across –40°C to +85°C. This value is confirmed in Section 7.5 of SBVS193D, where the typical VIT– is listed as 0.9 V, min 0.874 V, and max 0.914 V at TA = 25°C. The TPS3839A09DQNT maintains this specification in its X2SON-4 package without calibration or external components.

Does the TPS3839A09DQNT support manual reset functionality?

No, the TPS3839A09DQNT does not include a manual reset (MR) input. Unlike the TPS3831 variant, the TPS3839A09DQNT uses only three functional pins (VDD, GND, RESET) in its 4-pin X2SON package - Pin 2 is NC. If manual reset is required, the TPS3831A09DQNT is the functionally matched alternative with identical threshold and current specs.

What is the minimum supply voltage at which the TPS3839A09DQNT guarantees valid RESET output?

The TPS3839A09DQNT guarantees valid RESET output down to VDD = 0.6 V, as specified by the V(POR) parameter in Section 7.5 of SBVS193D. Below 0.6 V, the RESET output becomes undefined and must not be relied upon for system control. This 0.6 V POR level enables safe operation during deep brownout conditions common in aging alkaline cells.

How does the TPS3839A09DQNT achieve 150 nA typical supply current while maintaining accuracy?

The TPS3839A09DQNT achieves 150 nA typical supply current through periodic sampling - drawing ~15 µA for ~200 µs every ~100 ms to measure VDD against its internal reference. This duty-cycled architecture minimizes average current while preserving threshold accuracy and hysteresis. The technique is detailed in Section 9.2.2.1 and Figure 17 of SBVS193D.

Can the TPS3839A09DQNT be used with high-impedance voltage sources like energy harvesters?

Yes, but a 0.1 µF bypass capacitor must be placed directly at the VDD pin to prevent false resets caused by IR drop during the 15 µA sampling pulse. TI explicitly recommends this in Sections 9.2.2.1 and 11.1 of SBVS193D for high-source-impedance applications - including energy harvesters, thin-film batteries, and high-ESR capacitors.