Texas Instruments TPS3839K33DQNT

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 at 25°C, push-pull RESET output, valid operation down to 0.6 V VDD, and operates across –40°C to +85°C. It is used to ensure reliable power-on reset in portable glucose monitors and wearables.

For engineers reviewing the TPS3839K33 datasheet, TPS3839K33 pinout, TPS3839K33 application, or TPS3839K33 equivalent, key selection criteria include its 2.93 V threshold accuracy (±1% at 25°C), 200 ms reset delay, 0.9–6.5 V operating range, push-pull drive capability (2 mA sink), and X2SON-4 package compatibility with space-constrained PCB layouts.

Technical Context

The TPS3839K33 implements a precision comparator-based supervision architecture with internal hysteresis (29 mV typical) to prevent chatter during supply recovery. Its sampling circuitry draws only ~15 µA for ~200 µs per cycle, enabling 150 nA average quiescent current while maintaining accurate threshold detection.

Unlike the TPS3831 variant, the TPS3839K33 omits the manual reset (MR) input and uses a 3-pin SOT23 (DBZ) or 4-pin X2SON (DQN) package - this part is specifically the DQN variant. RESET assertion occurs when VDD falls below 2.857 V (min), and deassertion requires VDD to exceed 2.974 V (max) plus hysteresis recovery time.

Key Specifications

Pinout & Package

TPS3839K33 is packaged in a 1.00 mm × 1.00 mm, 4-pin X2SON (DQN) package with exposed thermal pad. This ultra-compact leadless package supports high-density layout and automated reflow assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3831K33DQNT, the TPS3839K33 removes MR to reduce complexity and pin count, while matching threshold accuracy and quiescent current. Versus MAX6373KA33+T, it delivers 10× lower supply current and guaranteed hysteresis - critical for long-life battery systems.

Availability

TPS3839K33 is available at Aetrix Electronics and suitable for portable medical devices, wearable electronics, and industrial IoT sensors requiring stable component supply with extended shelf life and low-temperature operation.

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 delivering analog and embedded processing solutions, with leadership in low-power design and precision analog IP.

The TPS383x family was developed to address ultralow-power voltage supervision needs in battery-constrained applications such as glucose meters, wearables, and smart meters - prioritizing nanoamp quiescent current and factory-trimmed accuracy.

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 a tolerance of ±1% at 25°C. Minimum and maximum values across temperature are 2.857 V and 2.974 V respectively. This threshold is optimized for monitoring standard 3.3 V rails with margin for LDO dropout and line regulation.

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. The TPS3839K33 relies solely on VDD monitoring and provides only the VDD, GND, RESET, and NC pins in its X2SON-4 package. If MR is required, TPS3831K33DQNT is the direct functional counterpart.

What is the recommended bypass capacitor for the TPS3839K33 VDD pin?

A 0.1 µF ceramic capacitor placed as close as possible to the VDD pin is recommended for the TPS3839K33. This mitigates voltage droop caused by the device's periodic 15 µA sampling current (~200 µs duration), which could otherwise trigger false resets in high-impedance supply paths - especially critical in battery-powered designs.

Can the TPS3839K33 operate from a 1.2 V supply?

Yes, the TPS3839K33 operates from 0.9 V to 6.5 V, so 1.2 V is within its specified range. At 1.2 V, it maintains valid RESET output logic (VOL ≤ 0.4 V, VOH ≥ VDD – 0.4 V) and retains 150 nA typical supply current. However, the 2.93 V threshold means it will assert RESET continuously below that level - making it unsuitable as a 1.2 V rail supervisor.

Is the TPS3839K33 pin-compatible with other TPS383x variants in X2SON-4?

Yes, all TPS383x devices in the X2SON-4 (DQN) package - including TPS3839K33, TPS3831K33, and TPS3839G33 - share identical pinout (VDD, GND, RESET, NC). This allows drop-in replacement across threshold voltages and MR/no-MR variants, provided the application does not require manual reset functionality.