Texas Instruments TPS3839A09DQNR

Overview

TPS3839A09DQNR 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 TPS3839A09DQNR datasheet, TPS3839A09DQNR pinout, TPS3839A09DQNR application, or TPS3839A09DQNR equivalent, key selection criteria include its 0.9 V threshold accuracy (±1% at 25°C), 200 ms reset delay, −40°C to +85°C operating range, SOT-23-3 package compatibility, and transient immunity for sub-10 µs voltage dips.

Technical Context

The TPS3839A09DQNR implements a precision bandgap-based voltage comparator with hysteresis (54 mV typical) to reject fast transients on VDD. Its sampling architecture draws only ~15 µA for ~200 µs per measurement cycle, sustaining average quiescent current at 150 nA.

Unlike the TPS3831 variant, the TPS3839A09DQNR omits the manual reset (MR) input and uses a 3-pin SOT-23-3 (DBZ) package with VDD, GND, and active-low RESET terminals - simplifying layout while retaining full reset assertion capability during brownout and power-up sequences.

Key Specifications

Pinout & Package

TPS3839A09DQNR is housed in a 3-pin SOT-23-3 (DBZ) package measuring 2.92 mm × 2.37 mm, optimized for space-constrained portable designs. The package includes no thermal pad and supports standard reflow profiles (MSL Level-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3839A09DQNR, the TPS3831A09DQNR adds manual reset capability at the cost of one extra pin and board area, while the MAX6375XR29+T trades 10.7× higher supply current for second-source availability - making TPS3839A09DQNR optimal for ultra-low-power, single-threshold, space-constrained designs.

Availability

TPS3839A09DQNR is available at Aetrix Electronics and suitable for portable medical devices, battery-powered IoT sensors, and industrial telemetry modules requiring stable component supply across extended product lifecycles.

Supply support for TPS3839A09DQNR 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 developed specifically for ultralow-power voltage supervision in battery-operated equipment, targeting applications where nanoscale quiescent current and sub-1 V threshold accuracy are mandatory design requirements.

FAQ

What is the minimum supply voltage required for TPS3839A09DQNR to assert a valid RESET signal?

The TPS3839A09DQNR guarantees a valid RESET output state when VDD is ≥0.6 V. Below this level, the RESET pin enters an undefined state and must not be relied upon for system control. This 0.6 V POR (power-on reset) specification allows robust startup sequencing even under cold-temperature or high-internal-resistance battery conditions, and is explicitly verified in the Electrical Characteristics table of the SBVS193D datasheet for TPS3839A09DQNR.

Does TPS3839A09DQNR support manual reset functionality?

No, TPS3839A09DQNR does not include a manual reset (MR) input. It is a 3-pin device (VDD, GND, RESET) with no MR terminal. Manual reset capability is exclusive to the TPS3831 series (e.g., TPS3831A09DQNR), which uses a 4-pin X2SON package and dedicates Pin 2 to the MR function. This distinction is clearly documented in the Pin Configuration and Functions section of the SBVS193D datasheet for TPS3839A09DQNR.

What is the actual reset delay time of TPS3839A09DQNR across temperature?

The TPS3839A09DQNR has a typical reset delay (td) of 200 ms, with a guaranteed range of 120 ms to 350 ms over −40°C to +85°C. Figure G002 in the SBVS193D datasheet shows measured delay variation: 180–220 ms across temperature for the TPS3839K33 variant, and TPS3839A09DQNR exhibits comparable stability due to shared internal timing circuitry. This delay begins after VDD rises above the 0.9 V threshold plus hysteresis (≈0.954 V).

Can TPS3839A09DQNR be used with a 1.2 V supply rail?

Yes, TPS3839A09DQNR operates fully within specification at 1.2 V. Its recommended operating range is 0.9 V to 6.5 V, and electrical characteristics including supply current (150 nA typ), RESET VOL (≤0.4 V at IOL = 120 µA), and threshold accuracy (±1%) are all validated at 1.2 V per the SBVS193D datasheet. At 1.2 V, the device consumes <200 nA and maintains full reset assertion integrity.

Is a bypass capacitor required for stable operation of TPS3839A09DQNR?

Yes, a 0.1 µF ceramic bypass capacitor is recommended directly at the VDD pin of TPS3839A09DQNR. Although the device draws only 150 nA average current, it samples VDD with ~15 µA pulses every ~6.7 ms. Without local capacitance, high source impedance (e.g., long PCB traces or resistive dividers) can cause voltage droop during sampling, leading to false resets. This requirement is specified in Section 9.2.2.1 and Layout Guidelines of the SBVS193D datasheet for TPS3839A09DQNR.