Texas Instruments TPS3839K50DQNT

Overview

TPS3839K50DQNT from Texas Instruments is an ultralow-power voltage supervisor IC that monitors a single supply rail and asserts an active-low RESET signal when VDD drops below 4.38 V (typical). It operates from 0.9 V to 6.5 V, consumes only 150 nA typical supply current, and delivers a push-pull RESET output with 200 ms typical delay. It is used in battery-powered microprocessor reset management for systems requiring long-term energy efficiency and reliable power-on sequencing.

For engineers reviewing the TPS3839K50DQNT datasheet, TPS3839K50DQNT pinout, TPS3839K50DQNT application, or TPS3839K50DQNT equivalent, key selection criteria include factory-trimmed 4.38 V threshold accuracy (±1%), operation down to 0.6 V valid output, −40°C to +85°C temperature range, and compatibility with high-impedance supply sources via 0.1 µF bypass capacitor support.

Technical Context

The TPS3839K50DQNT implements a precision comparator-based supervision architecture with built-in hysteresis (44 mV typical) to prevent chatter during threshold crossing. Its sampling scheme draws ~15 µA for ~200 µs per measurement cycle while maintaining 150 nA average quiescent current - enabling stable monitoring of weak or high-impedance supplies like single-cell alkaline or coin cells.

Unlike the TPS3831 variant, the TPS3839K50DQNT omits the manual reset (MR) input and uses a 3-pin SOT23 (DBZ) or 4-pin X2SON (DQN) package; this specific part is the DQN variant. RESET remains asserted until VDD rises above VIT– + Vhys and the 200 ms delay elapses, ensuring clean processor initialization after brownout recovery.

Key Specifications

Pinout & Package

TPS3839K50DQNT is housed in a 4-pin, 1.00 mm × 1.00 mm X2SON (DQN) package with exposed thermal pad. This ultra-compact, leadless package supports high-density PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3839K50DQNT, TPS3839K33DQNT offers identical form-factor and ultra-low power but targets 3.3 V systems, while MAX6326XR31D3+T trades 10× higher quiescent current for broader vendor support and simplified qualification - making it viable only where battery life is secondary to procurement flexibility.

Availability

TPS3839K50DQNT is available at Aetrix Electronics and suitable for portable medical devices, smart utility meters, wearable fitness trackers, and industrial sensor nodes requiring stable component supply across extended product lifecycles.

Supply support for TPS3839K50DQNT 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 for industrial, automotive, and personal electronics markets.

The TPS383x family was designed specifically for ultralow-power voltage supervision in battery-critical applications - prioritizing sub-µA current, factory-trimmed thresholds, and robust transient immunity over feature richness.

FAQ

What is the factory-trimmed reset threshold voltage of the TPS3839K50DQNT?

The TPS3839K50DQNT has a factory-trimmed negative-going threshold voltage (VIT–) of 4.38 V (typical), with ±1% accuracy at 25°C. This value is laser-trimmed during production and specified across the full −40°C to +85°C operating range. The device also provides 44 mV typical hysteresis to ensure clean release after recovery. This threshold makes the TPS3839K50DQNT ideal for supervising 4.5 V or 5 V supply rails where precise undervoltage detection is required.

Does the TPS3839K50DQNT support manual reset functionality?

No, the TPS3839K50DQNT does not include a manual reset (MR) input. It is the 3-pin SOT23 or 4-pin X2SON variant of the TPS383x family without MR capability - unlike the TPS3831 series, which integrates an MR pin. The TPS3839K50DQNT relies solely on VDD monitoring to assert RESET. If manual reset is required, engineers must select the TPS3831K50DQNT instead, which shares the same threshold and package but adds MR functionality.

What is the minimum supply voltage at which TPS3839K50DQNT guarantees valid RESET output logic?

The TPS3839K50DQNT guarantees valid RESET output logic down to 0.6 V on the VDD pin, as specified by the V(POR) parameter in the Electrical Characteristics table. Below this voltage, the RESET output becomes undefined and must not be relied upon for system control. This 0.6 V specification enables robust operation during deep battery discharge or cold-start conditions where supply voltage may dip significantly before stabilizing.

Can the TPS3839K50DQNT drive a microcontroller's bidirectional reset pin directly?

Yes, the TPS3839K50DQNT features a push-pull RESET output capable of directly driving most microcontroller bidirectional reset pins. However, TI recommends placing a small series resistor (e.g., 100 Ω) between RESET and the MCU pin to limit current if both devices attempt to drive the line simultaneously. This protects against potential latch-up or excessive current flow during state transitions, especially in systems where the MCU may assert its own reset while the TPS3839K50DQNT is active.

What package type and dimensions does the TPS3839K50DQNT use?

The TPS3839K50DQNT uses the X2SON-4 (DQN) package: a 4-pin, leadless, 1.00 mm × 1.00 mm body with an exposed thermal pad. Pin 1 is VDD, Pin 2 is GND, Pin 3 is RESET, and Pin 4 is NC (no internal connection). The package is RoHS-compliant, moisture sensitivity level (MSL) 1, and rated for reflow up to 260°C. Its compact size supports high-density PCB layouts in space-constrained portable and wearable applications.