Texas Instruments TPS3839K33DBZT

Overview

TPS3839K33 from Texas Instruments is an ultralow-power voltage supervisor IC designed for supply monitoring in battery-critical systems. It features a factory-trimmed 2.93 V reset threshold, 150 nA typical supply current, push-pull RESET output, and valid operation down to 0.6 V VDD - enabling reliable power-on reset in single-cell alkaline or Li-ion applications.

For engineers reviewing the TPS3839K33 datasheet, TPS3839K33 pinout, TPS3839K33 application, or TPS3839K33 equivalent, key selection criteria include its 200 ms reset delay, ±1% threshold accuracy at 25°C, −40°C to +85°C operating range, SOT-23-3 package compatibility, and immunity to fast VDD transients - all critical for portable medical, metering, and wearables designs.

Technical Context

The TPS3839K33 implements a precision comparator-based supervision architecture with built-in hysteresis (29 mV typical) to prevent oscillation during supply recovery. Its sampling circuitry draws only ~15 µA for ~200 µs per measurement cycle, sustaining average current at 150 nA while maintaining accurate threshold detection across 0.9–6.5 V input range.

Unlike the TPS3831 variant, the TPS3839K33 omits the manual reset (MR) input and uses a 3-pin SOT-23 (DBZ) package - simplifying layout and reducing BOM count where external reset assertion is unnecessary. RESET deassertion occurs after a fixed 120–350 ms delay following VDD rise above VIT− + Vhys.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package: 2.92 mm × 2.37 mm footprint, surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3831K33, the TPS3839K33 saves board area and eliminates MR routing complexity; compared with MAX6373K33, it delivers 10.7× lower supply current - making it the optimal choice for decade-long battery deployments in wearables and remote sensors.

Availability

TPS3839K33 is available at Aetrix Electronics and suitable for portable medical devices, smart metering systems, wearable electronics, and industrial sensor nodes requiring stable component supply over extended product lifecycles.

Supply support for TPS3839K33 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 specializing in analog and embedded processing solutions, with leadership in low-power design and high-reliability industrial components.

The TPS383x family was developed specifically for ultralow-power voltage supervision in battery-constrained applications - emphasizing sub-µA operation, wide input voltage range, and precision threshold stability across temperature.

FAQ

What is the exact reset threshold voltage of the TPS3839K33?

The TPS3839K33 has a factory-trimmed negative-going threshold voltage (VIT−) of 2.93 V, with ±1% accuracy at 25°C and guaranteed performance across −40°C to +85°C. This value is confirmed in the Electrical Characteristics table of the SBVS193D datasheet and applies specifically to the TPS3839K33 variant in SOT-23-3 packaging.

Does the TPS3839K33 support manual reset functionality?

No, the TPS3839K33 does not include a manual reset (MR) input. That feature is exclusive to the TPS3831 series (e.g., TPS3831K33). The TPS3839K33 is a 3-pin device (VDD, GND, RESET) with no MR pin - simplifying PCB layout where external reset assertion is unnecessary.

What is the minimum supply voltage at which the TPS3839K33 guarantees valid RESET output?

The TPS3839K33 guarantees valid RESET output down to 0.6 V VDD, as specified by the V(POR) parameter in the Electrical Characteristics table. Below this voltage, the RESET state is undefined - so system design must ensure critical operations complete before VDD falls below 0.6 V.

How does the TPS3839K33 achieve 150 nA typical supply current?

The TPS3839K33 achieves 150 nA typical supply current through periodic sampling architecture: it draws ~15 µA for ~200 µs every ~100 ms to measure VDD, resulting in ultra-low average current. This method is validated in Figure 2 (Supply Current vs Temperature) of the SBVS193D datasheet and applies directly to the TPS3839K33.

Is the TPS3839K33 pin-compatible with other TPS3839 variants?

Yes, all TPS3839 variants (e.g., TPS3839G25, TPS3839L30, TPS3839K33) share identical SOT-23-3 (DBZ) pinout and package dimensions. Threshold voltage is the only functional difference between them - enabling drop-in replacement during design iteration or supply chain substitution without PCB changes.