Texas Instruments SN74AUC1G19DBVR

Overview

SN74AUC1G19DBVR from Texas Instruments is a single 1-of-2 decoder/demultiplexer IC operating from 0.8 V to 2.7 V, optimized for 1.65–1.95 V supply. It buffers input A and routes true (Y0) and complemented (Y1) outputs when enable (E) is low, delivering ±8-mA drive at 1.8 V, 3 ns max propagation delay, and Ioff support for partial-power-down mode. It serves in portable audio routing and low-voltage logic level translation.

For engineers reviewing the SN74AUC1G19DBVR datasheet, SN74AUC1G19DBVR pinout, SN74AUC1G19DBVR application, or SN74AUC1G19DBVR equivalent, key selection criteria include sub-1-V operability, 3.6-V I/O tolerance for mixed-mode interfacing, latch-up immunity (>100 mA), and NanoFree™ SOT-23 package compatibility with high-density PCB layouts.

Technical Context

This device implements positive-logic decoding with active-low enable: when E = L, Y0 = A and Y1 = Ā; when E = H, both outputs go high-impedance. Its architecture supports dynamic bus isolation via Ioff, preventing backflow current during power sequencing in multi-rail systems.

Designed for sub-1-V to 2.7-V operation, it maintains guaranteed switching performance down to 0.8 V VCC while tolerating up to 3.6-V I/O signals-enabling safe interfacing between 1.8-V logic and 3.3-V peripherals without external level shifters.

Key Specifications

Pinout & Package

SOT-23 (DBV) package: 6-pin, 2.90 mm × 1.60 mm body, 1.45 mm max height, tape-and-reel (3000 pcs), RoHS-compliant NIPDAU finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar decoder/demultiplexer applications.

Compared with SN74LVC1G19DBVR and NC7SZ19P5X, the SN74AUC1G19DBVR uniquely supports sub-1-V operation and delivers higher drive strength in the 1.65–1.95 V sweet spot-making it optimal for modern battery-powered devices prioritizing energy efficiency and mixed-voltage interoperability.

Availability

SN74AUC1G19DBVR is available at Aetrix Electronics and suitable for portable audio routing, SSD power sequencing, and embedded PC I/O expansion requiring stable component supply across high-mix, low-volume production runs.

Supply support for SN74AUC1G19DBVR 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 leader specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in power management and signal chain technologies.

The SN74AUC1G19 belongs to TI's AUC Sub-1-V Little Logic family, engineered specifically for ultra-low-voltage, high-speed interface applications in portable and energy-sensitive electronics.

FAQ

What is the minimum operating voltage for SN74AUC1G19DBVR?

The SN74AUC1G19DBVR operates down to 0.8 V VCC, with guaranteed functionality across the full 0.8–2.7 V range. Its design is specifically optimized for 1.65–1.95 V operation, where parameters like propagation delay and output drive are characterized. Below 1.65 V, timing and drive degrade gradually but remain functional-making SN74AUC1G19DBVR suitable for deep-sleep modes in battery-powered devices.

Does SN74AUC1G19DBVR support 3.3-V I/O while powered from 1.8 V?

Yes, SN74AUC1G19DBVR features 3.6-V I/O tolerance, allowing its inputs and outputs to safely interface with 3.3-V signals even when VCC is supplied at 1.8 V. This eliminates the need for external level-shifting circuitry in mixed-voltage systems such as portable audio docks connecting 1.8-V SoCs to 3.3-V codecs or amplifiers.

How does the Ioff feature work in SN74AUC1G19DBVR?

The Ioff circuitry in SN74AUC1G19DBVR disables all outputs and blocks current flow when VCC = 0 V or is unpowered, preventing damaging back-current from live I/O lines into the unpowered device. This enables safe partial-power-down operation in multi-rail systems-such as SSDs where NAND, controller, and DRAM rails power up/down independently-without risk of latch-up or data corruption.

What is the maximum propagation delay of SN74AUC1G19DBVR at 1.8 V?

At VCC = 1.8 V and CL = 15 pF, the SN74AUC1G19DBVR has a maximum propagation delay (tpd) of 3 ns for transitions from A or E to Y0/Y1. This value is specified under worst-case conditions (min VCC, max temperature, max load), ensuring timing margins in high-speed portable applications like audio path selection or SSD enable sequencing.

Is SN74AUC1G19DBVR pin-compatible with other variants in the SN74AUC1G19 family?

Yes, SN74AUC1G19DBVR shares identical pinout and function with other package variants (e.g., DCK, DRL, YZP), all using 6-pin configurations with A, E, GND, Y1, VCC, Y0 assignments. Mechanical dimensions differ, but electrical behavior, timing, and logic function are fully consistent-enabling drop-in replacement across SOT-23, SC70, SOT-5X3, and DSBGA footprints where board layout permits.