Texas Instruments TPS3839K50DBZT

Overview

TPS3839K50DBZT from Texas Instruments is an ultralow-power voltage supervisor IC that monitors single-rail supply voltages and asserts an active-low RESET signal when VDD drops below 4.38 V (typical), with 44 mV hysteresis, 200 ms reset delay (typical), and 150 nA supply current (typical) over –40°C to +85°C. It operates from 0.9 V to 6.5 V and supports portable battery-powered systems requiring reliable power-on reset and brownout detection.

For engineers reviewing the TPS3839K50DBZT datasheet, TPS3839K50DBZT pinout, TPS3839K50DBZT application, or TPS3839K50DBZT equivalent, key selection criteria include factory-trimmed 4.38 V threshold accuracy (±1%), push-pull RESET output drive capability up to 2 mA, valid operation down to 0.6 V VDD, transient rejection robustness, and SOT-23-3 package compatibility for space-constrained designs.

Technical Context

The TPS3839K50DBZT implements a precision comparator-based supervision architecture with internal hysteresis to prevent oscillation during slow VDD transitions. Its sampling circuitry draws only ~15 µA for ~200 µs per measurement cycle, enabling 150 nA average quiescent current while maintaining accurate threshold detection.

Unlike the TPS3831 variant, the TPS3839K50DBZT omits the manual reset (MR) input and uses a 3-pin SOT-23 (DBZ) package with VDD, GND, and push-pull RESET terminals - simplifying layout and reducing BOM count in applications where external reset initiation is unnecessary.

Key Specifications

Pinout & Package

TPS3839K50DBZT is housed in a 3-pin SOT-23 (DBZ) package measuring 2.92 mm × 2.37 mm, optimized for high-density PCB layouts and automated assembly. The package features gull-wing leads and RoHS-compliant NiPdAu lead finish with MSL Level-1 rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3839K50DBZT, TPS3839G33DBZT offers identical architecture and ultra-low power but targets 3.3-V rails, while MAX6375XR29+T trades 10× higher supply current for broader vendor availability and legacy design continuity - neither provides pin-to-pin replacement without schematic or layout changes.

Availability

TPS3839K50DBZT is available at Aetrix Electronics and suitable for portable medical devices, smart utility meters, wearable fitness trackers, industrial IoT sensors, and battery-backed memory systems requiring stable component supply across long product lifecycles.

Supply support for TPS3839K50DBZT 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, personal electronics, and communications markets.

The TPS383x family was designed specifically for ultralow-power voltage supervision in battery-critical applications - emphasizing sub-200 nA operation, factory-trimmed thresholds, and robust transient immunity without compromising timing accuracy or output drive strength.

FAQ

What is the exact reset threshold voltage of the TPS3839K50DBZT?

The TPS3839K50DBZT has a factory-trimmed negative-going threshold voltage (VIT−) of 4.38 V (typical), with ±1% accuracy over temperature and process variation. This value is confirmed in the Electrical Characteristics table of the SBVS193D datasheet, and applies specifically to the K50 variant - not other members of the TPS383x family.

Does the TPS3839K50DBZT support manual reset functionality?

No, the TPS3839K50DBZT does not include a manual reset (MR) input. That feature is exclusive to the TPS3831 series (e.g., TPS3831K50DQNR). The TPS3839K50DBZT is a 3-pin device (VDD, GND, RESET) with no MR pin - simplifying design for applications where external reset initiation is unnecessary.

What is the minimum supply voltage at which the TPS3839K50DBZT guarantees valid RESET output behavior?

The TPS3839K50DBZT guarantees valid RESET output logic state down to 0.6 V VDD, as specified by the V(POR) parameter in Section 7.5 of the datasheet. Below 0.6 V, the RESET output becomes undefined and must not be relied upon for system reset integrity.

Can the TPS3839K50DBZT drive a microcontroller's bidirectional reset pin directly?

Yes, the TPS3839K50DBZT's push-pull RESET output can drive most microcontroller bidirectional reset pins directly. However, TI recommends adding a 100-Ω series resistor between RESET and the MCU pin to limit current if both devices attempt to drive the line simultaneously - as detailed in Figure 16 of the SBVS193D datasheet.

How does the TPS3839K50DBZT achieve 150 nA typical supply current while maintaining accurate voltage monitoring?

The TPS3839K50DBZT achieves 150 nA typical supply current by using a duty-cycled sampling architecture: it draws ~15 µA for ~200 µs every ~100 ms to measure VDD, resulting in extremely low average current. This method is validated across temperature and supply voltage in Figure 2 (G001) of the SBVS193D datasheet.