Texas Instruments TPS3839G33DQNR

Overview

TPS3839G33DQNR from Texas Instruments is an ultralow-power voltage supervisor IC designed to monitor 3.3-V supply rails in battery-critical systems. It features a factory-trimmed 3.08-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 glucose monitors and wearables.

For engineers reviewing the TPS3839G33DQNR datasheet, TPS3839G33DQNR pinout, TPS3839G33DQNR application, or TPS3839G33DQNR equivalent, key selection criteria include its 200-ms reset delay, −40°C to +85°C temperature range, SOT-23-3 package compatibility, and immunity to fast VDD transients per Figure 13 of SBVS193D.

Technical Context

The TPS3839G33DQNR implements a precision comparator-based supervision architecture with built-in hysteresis (31 mV) to prevent oscillation during supply recovery. Its sampling circuitry draws only ~15 µA for 200 µs every ~100 ms, sustaining average current at 150 nA while maintaining accurate threshold detection across 0.9–6.5 V input range.

Unlike the TPS3831 variant, the TPS3839G33DQNR omits the manual reset (MR) pin and uses a 3-pin SOT-23 (DBZ) package. Its RESET output asserts low when VDD falls below 3.003 V (min) and deasserts after 120–350 ms once VDD exceeds 3.126 V (max), with guaranteed functionality down to 0.6 V VDD.

Key Specifications

Pinout & Package

TPS3839G33DQNR is housed in a 3-pin SOT-23 (DBZ) package measuring 2.92 mm × 2.37 mm, optimized for space-constrained portable designs. The package has no thermal pad and requires standard reflow profile (MSL Level-1).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3839G33DQNR, TPS3831K33DQNR adds manual reset functionality at the cost of an extra pin and package size, while MAX6326UT31D3+ trades ultralow power for broader vendor support but sacrifices 10× higher quiescent current and open-drain limitations.

Availability

TPS3839G33DQNR is available at Aetrix Electronics and suitable for portable medical devices, wearables, smart meters, and industrial handhelds requiring stable component supply across extended production lifecycles.

Supply support for TPS3839G33DQNR 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 engineered specifically for ultralow-power voltage supervision in battery-operated medical, metering, and wearable systems - prioritizing sub-200-nA operation and guaranteed functionality below 1-V supply.

FAQ

What is the exact reset threshold voltage of TPS3839G33DQNR?

The TPS3839G33DQNR has a factory-trimmed negative-going threshold voltage (VIT−) of 3.08 V (typical), with min/max values of 3.003 V and 3.126 V across temperature and process variation. This 2.93-V nominal threshold (per device option table) is calibrated to 3.08 V for the G33 variant, ensuring precise detection of 3.3-V rail brownouts.

Does TPS3839G33DQNR support manual reset functionality?

No, TPS3839G33DQNR does not include a manual reset (MR) pin. That feature is exclusive to the TPS3831 series (e.g., TPS3831K33DQNR). The TPS3839G33DQNR is a 3-pin device (VDD, GND, RESET) with no MR terminal - it responds only to VDD-supply conditions.

What is the minimum supply voltage at which TPS3839G33DQNR guarantees valid RESET output?

The TPS3839G33DQNR guarantees valid RESET output down to 0.6 V VDD, as specified by the V(POR) parameter in Section 7.5. Below this voltage, the RESET state is undefined and must not be relied upon for system initialization.

How does TPS3839G33DQNR handle fast transients on the VDD line?

The TPS3839G33DQNR rejects fast VDD transients per Figure 13 in SBVS193D: it ignores pulses shorter than ~23 µs or with amplitude less than 2.93% below VIT−. This built-in immunity prevents false resets during switching noise or load-step events without requiring external RC filtering.

Is a bypass capacitor required for stable operation of TPS3839G33DQNR?

Yes, TI recommends a 0.1-µF ceramic capacitor placed close to the VDD pin. During its periodic 15-µA sampling burst, the TPS3839G33DQNR can induce voltage droop on high-impedance supplies; the capacitor maintains local VDD stability and prevents false resets caused by apparent supply collapse.