Texas Instruments SN74AUC17RGYRG4

Overview

SN74AUC17RGYRG4 from Texas Instruments is a hex Schmitt-trigger buffer IC operating across 0.8 V to 2.7 V supply, optimized for 1.65–1.95 V V_CC, with 1.8 ns max propagation delay at 1.8 V, ±8 mA output drive, and I_off support for partial-power-down mode. It performs Y = A logic on six independent channels and is used in low-voltage signal conditioning for noise-immune digital interfaces in portable and battery-powered systems.

For engineers reviewing the SN74AUC17RGYRG4 datasheet, SN74AUC17RGYRG4 pinout, SN74AUC17RGYRG4 application, or SN74AUC17RGYRG4 equivalent, key selection criteria include sub-2-V operation capability, Schmitt-trigger hysteresis (≥0.37 V at 1.65 V), I_off current ≤±10 µA, 14-pin VQFN package thermal pad requirements, and 3.6-V I/O tolerance for mixed-mode interfacing.

Technical Context

This device implements six noninverting Schmitt-trigger buffers with asymmetric input thresholds: VT+ ranges from 0.79 V to 1.16 V and VT− from 0.39 V to 0.62 V at 1.65 V V_CC, yielding 0.37–0.62 V hysteresis. Each channel operates independently without internal interconnects or shared control lines.

It supports true partial-power-down via I_off circuitry that disables outputs when V_CC = 0 V, blocking reverse current flow. The 14-pin VQFN (RGY) package features an exposed thermal pad requiring PCB soldering for thermal and mechanical integrity per TI SLUA271 guidelines.

Key Specifications

Pinout & Package

The SN74AUC17RGYRG4 uses a 14-pin VQFN package (RGY) with 3.5 mm × 3.5 mm body, 0.5 mm pitch, and an exposed thermal pad requiring solder connection to PCB ground plane for thermal dissipation and mechanical reliability.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Schmitt-trigger buffer applications.

Compared with SN74LVC17APW and SN74AUP1G17DBVR, the SN74AUC17RGYRG4 uniquely balances sub-1-V operability, 1.8 ns speed, and six-channel density in a thermally enhanced 3.5-mm QFN-making it optimal for space- and power-sensitive multi-signal conditioning in modern portable electronics.

Availability

SN74AUC17RGYRG4 is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable device power sequencing, FPGA I/O translation, USB 2.0 data line conditioning, and low-voltage logic level-shifting applications requiring stable component supply and long-term manufacturability.

Supply support for SN74AUC17RGYRG4 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 specializing in analog, embedded processing, and connectivity technologies, with over 90 years of innovation in high-reliability silicon design and manufacturing.

The SN74AUC logic family targets ultra-low-voltage, high-speed digital signal conditioning for portable, battery-powered, and energy-efficient systems-emphasizing sub-2-V operation, I/O tolerance, and minimal power consumption without sacrificing timing performance.

FAQ

What is the minimum operating voltage for the SN74AUC17RGYRG4?

The SN74AUC17RGYRG4 operates down to 0.8 V V_CC, with full functionality-including Schmitt-trigger hysteresis and specified output drive-guaranteed from 1.65 V to 1.95 V. Below 1.65 V, parameters such as t_pd and ∆V_T degrade gradually but remain functional per the absolute maximum ratings table. This makes the SN74AUC17RGYRG4 suitable for brown-out detection circuits and ultra-low-power wake-up paths where other 1.8-V logic would fail.

Does the SN74AUC17RGYRG4 support hot swapping or partial power-down?

Yes, the SN74AUC17RGYRG4 includes I_off circuitry that actively disables all six outputs when V_CC = 0 V, limiting reverse current to ±10 µA max. This feature enables safe insertion into live backplanes and supports controlled power sequencing in multi-rail systems. Unlike passive isolation, the I_off function is built into the silicon and requires no external control signals-ensuring robust behavior during SN74AUC17RGYRG4 power transitions.

What is the purpose of the exposed thermal pad on the SN74AUC17RGYRG4 package?

The exposed thermal pad on the SN74AUC17RGYRG4 serves dual mechanical and thermal roles: it must be soldered to a PCB ground plane to ensure structural integrity and dissipate heat generated during sustained ±8 mA output switching. TI specifies ≥80% solder coverage and recommends following SLUA271 layout guidelines. Omitting this connection risks solder joint fatigue, thermal runaway under load, and non-compliance with JEDEC MSL-2 reflow profiles-directly impacting long-term reliability of the SN74AUC17RGYRG4 in production assemblies.

Can unused inputs on the SN74AUC17RGYRG4 be left floating?

No, all unused inputs on the SN74AUC17RGYRG4 must be tied to either V_CC or GND. Floating CMOS inputs cause increased ICC, unpredictable output states, and potential oscillation due to noise coupling-degrading both power efficiency and signal integrity. TI's application report SCBA004 explicitly warns against this practice. For the SN74AUC17RGYRG4, tying unused A pins directly to V_CC or GND (not through resistors) ensures deterministic behavior and maintains the specified 10 µA max ICC across temperature.

How does the Schmitt-trigger hysteresis of the SN74AUC17RGYRG4 improve noise immunity?

The SN74AUC17RGYRG4 provides programmable noise immunity via separate VT+ (0.79–1.16 V) and VT− (0.39–0.62 V) thresholds at 1.65 V V_CC, resulting in 0.37–0.62 V hysteresis. This gap prevents multiple output transitions when input signals cross threshold slowly or contain high-frequency noise-common in motor encoder feedback, pushbutton debouncing, or long PCB traces. Unlike standard buffers, the SN74AUC17RGYRG4 eliminates external RC filters while guaranteeing clean, single-edge outputs even with 100-mV peak-to-peak noise.