Texas Instruments TPS3839G18DBZR

Overview

TPS3839G18DBZR from Texas Instruments is an ultralow-power voltage supervisor IC designed for single-rail supply monitoring in battery-critical systems. It features a factory-trimmed 1.67 V reset threshold, 150 nA typical supply current at 25°C, push-pull RESET output, and valid operation down to 0.6 V VDD - enabling reliable power-on reset in sub-1.8 V microcontroller applications such as glucose monitors and wearables.

For engineers reviewing the TPS3839G18DBZR datasheet, TPS3839G18DBZR pinout, TPS3839G18DBZR application, or TPS3839G18DBZR equivalent, key selection considerations include its 1.67 V threshold accuracy (±1% at 25°C), 200 ms reset delay, SOT-23-3 package compatibility, transient rejection capability, and suitability for low-voltage alkaline-battery systems where quiescent current below 200 nA is mandatory.

Technical Context

The TPS3839G18DBZR implements a precision bandgap-based voltage comparator with hysteresis (17 mV typical) to detect VDD drops below 1.67 V and assert an active-low RESET signal. Its sampling architecture draws only ~15 µA for ~200 µs per measurement cycle, sustaining average current at 150 nA while rejecting transients ≥20 µs in duration when amplitude exceeds specified thresholds.

Unlike the TPS3831 variant, the TPS3839G18DBZR omits the manual reset (MR) input and uses a 3-pin SOT-23 (DBZ) package with VDD, GND, and RESET terminals - simplifying layout in space-constrained portable designs while maintaining full functional supervision across –40°C to +85°C ambient temperature.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package: 2.92 mm × 2.37 mm footprint, surface-mount, lead-free, RoHS-compliant, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3839G18DBZR, TPS3831G18DQNR adds manual reset capability in a smaller package but increases design complexity, while MAX6371XR29+T offers lower cost at the expense of threshold accuracy, hysteresis control, and documented transient rejection - making TPS3839G18DBZR optimal for precision, low-power, noise-immune supervision.

Availability

TPS3839G18DBZR is available at Aetrix Electronics and suitable for portable medical devices, wearable electronics, metering systems, and industrial sensor nodes requiring stable component supply across extended product lifecycles.

Supply support for TPS3839G18DBZR 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, and personal electronics markets.

The TPS383x family was engineered specifically for ultralow-power voltage supervision in battery-constrained applications - emphasizing sub-200 nA quiescent current, wide input voltage range, and factory-trimmed accuracy to eliminate calibration overhead in high-volume portable devices.

FAQ

What is the exact reset threshold voltage of the TPS3839G18DBZR?

The TPS3839G18DBZR has a factory-trimmed negative-going threshold voltage (VIT–) of 1.67 V, with ±1% accuracy at 25°C and 17 mV typical hysteresis. This value is confirmed in the Electrical Characteristics table of the SBVS193D datasheet and applies specifically to the TPS3839G18DBZR variant in SOT-23-3 packaging.

Does the TPS3839G18DBZR support manual reset functionality?

No, the TPS3839G18DBZR does not include a manual reset (MR) input. That feature is exclusive to the TPS3831 series (e.g., TPS3831G18DQNR). The TPS3839G18DBZR is a 3-pin device with only VDD, GND, and RESET terminals - simplifying layout but removing external reset control capability.

What is the minimum supply voltage at which TPS3839G18DBZR guarantees valid RESET output?

The TPS3839G18DBZR guarantees a valid RESET output state down to VDD = 0.6 V, as specified by the V(POR) parameter in Section 7.5 of the datasheet. Below this voltage, the RESET output becomes undefined and must not be relied upon for system reset integrity.

Can the TPS3839G18DBZR operate from a single alkaline AA/AAA cell?

Yes, the TPS3839G18DBZR operates across 0.9 V to 6.5 V, fully covering the discharge curve of a single alkaline cell (1.5 V fresh → 0.9 V end-of-life). Its 1.67 V threshold aligns with common 1.8 V LDO inputs, and 150 nA current preserves battery life in long-duration deployments.

What package type and dimensions does the TPS3839G18DBZR use?

The TPS3839G18DBZR uses the SOT-23-3 (DBZ) package: 2.92 mm × 2.37 mm body size, 1.45 mm height, with gull-wing leads. This is distinct from the X2SON-4 option used by TPS3831 variants and is explicitly listed in the Device Options table and Package Option Addendum of the SBVS193D datasheet.