Texas Instruments TPS3839K50DBZR

Overview

TPS3839K50DBZR from Texas Instruments is an ultralow-power voltage supervisor IC designed for supply monitoring in battery-critical systems. It features a factory-trimmed 4.38 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 glucose monitors and wearables.

For engineers reviewing the TPS3839K50DBZR datasheet, TPS3839K50DBZR pinout, TPS3839K50DBZR application, or TPS3839K50DBZR equivalent, key selection criteria include its 4.38 V threshold accuracy (±1% at 25°C), 200 ms reset delay, −40°C to +85°C temperature range, and SOT-23-3 package compatibility with space-constrained portable designs.

Technical Context

The TPS3839K50DBZR implements a precision comparator-based supervision architecture with built-in hysteresis (44 mV) to prevent chatter during supply recovery. Its sampling circuitry draws only ~15 µA for ~200 µs per measurement cycle, sustaining average IDD of 150 nA while maintaining valid RESET assertion down to VDD = 0.6 V.

Unlike the TPS3831 series, this variant omits the manual reset (MR) input and uses a 3-pin SOT-23 (DBZ) package with VDD, GND, and active-low RESET terminals - simplifying layout and reducing BOM count in single-supply monitoring applications.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package: 2.92 mm × 2.37 mm footprint, surface-mount, no thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3839K50DBZR, TPS3839K33DBZR offers identical ultra-low power and form factor but targets different rail voltages, while MAX6375XR29+T trades 10× higher current for broader temperature coverage - making TPS3839K50DBZR optimal for precision 4.5 V brownout protection in long-life portable devices.

Availability

TPS3839K50DBZR is available at Aetrix Electronics and suitable for glucose monitors, wearable fitness trackers, and industrial handheld meters requiring stable component supply with guaranteed long-term manufacturability.

Supply support for TPS3839K50DBZR 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 product line was engineered specifically for ultralow-power supply monitoring in battery-operated medical and portable devices, emphasizing sub-200 nA operation and factory-trimmed thresholds to eliminate calibration overhead.

FAQ

What is the minimum supply voltage required for valid RESET assertion in TPS3839K50DBZR?

The TPS3839K50DBZR guarantees valid RESET output logic state down to VDD = 0.6 V, as specified by the V(POR) parameter. Below this level, the RESET signal becomes undefined and must not be relied upon for system control. This feature allows TPS3839K50DBZR to provide deterministic behavior during deep brownout conditions common in end-of-life battery scenarios.

Does TPS3839K50DBZR include a manual reset (MR) input?

No, the TPS3839K50DBZR does not include a manual reset input. It is a 3-pin device (VDD, GND, RESET) in SOT-23-3 package. The MR pin is present only on the TPS3831 series (4-pin X2SON variants). TPS3839K50DBZR relies solely on VDD monitoring for reset generation.

What is the reset delay time specification for TPS3839K50DBZR?

The TPS3839K50DBZR provides a typical reset delay time (td) of 200 ms after VDD rises above the threshold voltage plus hysteresis. The datasheet specifies a range of 120 ms to 350 ms across temperature and process variation. This delay ensures microcontrollers complete power stabilization before releasing reset.

Can TPS3839K50DBZR operate from a 1.2 V supply?

Yes, TPS3839K50DBZR operates from 0.9 V to 6.5 V, so 1.2 V is within its recommended operating range. At 1.2 V, it maintains 150 nA typical supply current and asserts RESET when VDD falls below 4.38 V - though note that 4.38 V exceeds 1.2 V, meaning RESET will remain asserted continuously. It is intended for monitoring supplies ≥4.38 V.

What package type is used for TPS3839K50DBZR?

TPS3839K50DBZR uses the SOT-23-3 (DBZ) package: 2.92 mm × 2.37 mm body size, surface-mount, with three terminals (VDD, GND, RESET). This compact outline supports high-density PCB layouts in portable medical and consumer electronics.