Texas Instruments TPS3839K33DBZR

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, 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, this page delivers verified electrical parameters, thermal behavior across –40°C to +85°C, reset delay timing (200 ms typ), transient rejection characteristics, and precise SOT-23-3 package implementation guidance.

Technical Context

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

Unlike manual-reset variants (e.g., TPS3831), the TPS3839K33 omits MR functionality and uses a 3-pin SOT-23 (DBZ) configuration - simplifying layout but requiring external reset initiation if system-level manual reset is needed. RESET asserts low when VDD falls below 2.857 V (min) and remains asserted for ≥120 ms after VDD exceeds 2.974 V (max).

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package: 2.92 mm × 2.37 mm body, 0.95 mm height, surface-mount, lead-free, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS3831K33DQN, the TPS3839K33DBZR removes MR to reduce footprint and cost; compared with MAX6373KA33+T, it delivers 10.7× lower quiescent current and ±1% vs ±2.5% threshold accuracy - critical for long-life portable designs.

Availability

TPS3839K33DBZR is available at Aetrix Electronics and suitable for portable medical devices, battery-powered meters, wearable electronics, and industrial sensor nodes requiring stable component supply over extended production lifecycles.

Supply support for TPS3839K33DBZR 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 ICs.

The TPS383x family was developed specifically for ultralow-power voltage supervision in battery-constrained applications - targeting multi-year operation in medical, metering, and IoT edge devices.

FAQ

What is the exact reset threshold voltage of the TPS3839K33DBZR?

The TPS3839K33DBZR has a factory-trimmed negative-going threshold voltage (VIT–) of 2.93 V, with a guaranteed range of 2.857 V (min) to 2.974 V (max) at 25°C. This value is specified in the Electrical Characteristics table of the SBVS193D datasheet and applies directly to the TPS3839K33DBZR across its full operating temperature range (–40°C to +85°C).

Does the TPS3839K33DBZR support manual reset functionality?

No, the TPS3839K33DBZR does not include a manual reset (MR) input. It is a 3-pin device (VDD, GND, RESET) in SOT-23-3 (DBZ) package. Manual reset capability is exclusive to the TPS3831 series (e.g., TPS3831K33DQN), which uses a 4-pin X2SON package with dedicated MR pin. The TPS3839K33DBZR relies solely on VDD monitoring.

What is the minimum supply voltage at which the TPS3839K33DBZR guarantees valid RESET output logic?

The TPS3839K33DBZR guarantees valid RESET output logic down to 0.6 V VDD, as specified by the V(POR) parameter in the Electrical Characteristics table. Below 0.6 V, the RESET output state is undefined and must not be relied upon for system safety. This feature allows the TPS3839K33DBZR to remain functional deeper into battery discharge than most competing supervisors.

How does the TPS3839K33DBZR handle fast voltage transients on the VDD line?

The TPS3839K33DBZR incorporates built-in transient rejection that ignores VDD dips shorter than ~20 µs. As shown in Figure 13 of the SBVS193D datasheet, it requires both sufficient amplitude (measured from VIT–) and duration to trigger reset - preventing false assertions from switching noise or ESD-induced glitches. This behavior is inherent to the internal sampling architecture and requires no external components.

What bypass capacitor value is recommended for the TPS3839K33DBZR VDD pin?

A 0.1 µF ceramic capacitor is recommended adjacent to the VDD pin of the TPS3839K33DBZR. This mitigates voltage droop caused by the device's periodic 15 µA sampling current (active for ~200 µs), especially when sourced from high-impedance supplies like resistive dividers or long PCB traces. The capacitor ensures stable threshold detection and avoids false resets due to localized VDD sag.