Texas Instruments SN74AUC2G126DCTR

Overview

SN74AUC2G126DCTR from Texas Instruments is a dual 3-state bus buffer gate optimized for 1.65–1.95 V operation, delivering ±8 mA output drive at 1.8 V, sub-1-V operability, 1.9 ns max propagation delay, and Ioff support for partial-power-down mode. It serves as a level-translating bidirectional interface in low-voltage portable logic systems.

For engineers reviewing the SN74AUC2G126DCTR datasheet, SN74AUC2G126DCTR pinout, SN74AUC2G126DCTR application, or SN74AUC2G126DCTR equivalent, key selection criteria include 1.8-V tpd performance, 3-state control timing (ten/tdis), Ioff-enabled power sequencing, and SSOP-8 package compatibility with space-constrained PCB layouts.

Technical Context

This device implements two independent noninverting buffers, each with dedicated 3-state output-enable (OE) control. Each channel operates across 0.8–2.7 V supply range but is characterized and optimized for 1.65–1.95 V VCC, enabling mixed-mode interfacing between 1.8-V logic domains and higher-voltage peripherals.

Its Ioff circuitry actively disables outputs during power-down to prevent backflow current, while ESD protection exceeds JESD22-A114 (2000-V HBM), JESD22-A115 (200-V MM), and JESD22-C101 (1000-V CDM). Latch-up immunity exceeds 100 mA per JESD78 Class II.

Key Specifications

Pinout & Package

SN74AUC2G126DCTR uses an 8-pin SSOP (DCT) package, 3.0 mm × 3.0 mm body, 1.3 mm max height, 0.65 mm lead pitch, with gull-wing leads and Pin 1 marked by a beveled corner.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual 3-state buffer applications.

Compared with SN74LVC2G126DCTR and SN74AUP2G126DCTR, the SN74AUC2G126DCTR uniquely balances 1.9 ns speed, ±8 mA drive, and sub-1-V operation - making it optimal for 1.8-V high-throughput interfaces where timing closure and power efficiency are jointly constrained.

Availability

SN74AUC2G126DCTR is available at Aetrix Electronics and suitable for mobile baseband interfaces, wearable sensor hubs, industrial PLC I/O modules, automotive body control units, and battery-powered instrumentation requiring stable component supply across production lifecycles.

Supply support for SN74AUC2G126DCTR 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 decades of innovation in low-voltage logic families and advanced packaging technologies.

The SN74AUC2G126DCTR belongs to TI's AUC Sub-1-V Little Logic portfolio, designed specifically for high-speed, ultra-low-power signal routing in space- and energy-constrained portable and embedded systems.

FAQ

What is the maximum operating frequency supported by SN74AUC2G126DCTR?

The SN74AUC2G126DCTR does not specify a maximum clock frequency in its datasheet. Instead, its 1.9 ns max propagation delay at 1.8 V implies reliable operation up to approximately 250 MHz for single-edge data paths under typical 15–30 pF load conditions. System-level timing must account for board trace delays and setup/hold margins. The SN74AUC2G126DCTR is intended for general-purpose bus buffering-not synchronous clock distribution-so jitter and skew are not characterized.

Can SN74AUC2G126DCTR be used with a 3.3-V microcontroller I/O?

Yes, the SN74AUC2G126DCTR supports 3.6-V I/O tolerance, meaning its inputs accept 0–3.6 V signals and its outputs swing from GND to VCC + 0.5 V. When powered at 1.8 V, it safely receives 3.3-V logic-high inputs without damage or level-shifter circuitry. However, its outputs will only reach ~2.3 V (1.8 V + 0.5 V), so downstream 3.3-V receivers must recognize 2.3 V as a valid high level - verified by checking VIH thresholds in those devices' datasheets.

Does SN74AUC2G126DCTR require external pull-up or pull-down resistors on OE pins?

TI recommends tying OE pins to GND via a pulldown resistor during power-up/power-down to guarantee high-impedance outputs before VCC stabilizes. The minimum resistor value depends on the driving source's current-sinking capability; for most CMOS drivers, 10 kΩ is sufficient. The SN74AUC2G126DCTR itself does not integrate internal pull resistors, so external biasing is required for fail-safe 3-state behavior in systems with uncontrolled OE states during reset sequences.

How does the Ioff feature of SN74AUC2G126DCTR protect the system during partial power-down?

The Ioff circuitry in SN74AUC2G126DCTR disables all output buffers and isolates input/output terminals when VCC = 0 V, limiting current flow to ±10 µA even if external signals remain active at 2.7 V. This prevents damaging backfeed current from powered peripherals into a de-energized domain - critical in multi-rail systems like wearables with separate battery-backed RTC and main application processors. No external diodes or MOSFET switches are needed to implement this protection.

Is SN74AUC2G126DCTR RoHS compliant and lead-free?

Yes, SN74AUC2G126DCTR is RoHS compliant and features NiPdAu (NIPDAU) lead finish with Sn (tin) ball composition. Its MSL rating is Level-1 at 260°C peak reflow, and it ships in tape-and-reel packaging (3000 units per reel) with Q3 pin-1 quadrant orientation. Full compliance documentation, including material declarations and test reports, is available through TI's Quality & Environmental page using the orderable part number SN74AUC2G126DCTR.