Texas Instruments 74LVC2G125DCUTE4

Overview

74LVC2G125DCUTE4 from Texas Instruments is a dual 3-state bus buffer gate IC designed for 1.65-V to 5.5-V operation, featuring two independent noninverting buffers with active-low output-enable controls (1OE, 2OE), ±24-mA output drive at 3.3 V, 4.3-ns max propagation delay at 3.3 V, and Ioff support for live insertion in partial-power-down systems. It enables bidirectional signal isolation in high-speed data acquisition and SSD interconnects.

For engineers reviewing the 74LVC2G125DCUTE4 datasheet, 74LVC2G125DCUTE4 pinout, 74LVC2G125DCUTE4 application, or 74LVC2G125DCUTE4 equivalent, key selection criteria include 3-state output timing control, overvoltage-tolerant inputs up to 5.5 V, thermal performance in VSSOP packaging, and compatibility with 1.8-V/2.5-V/3.3-V/5-V mixed-voltage logic interfaces.

Technical Context

The 74LVC2G125DCUTE4 implements dual independent noninverting buffer functions (Y = A) with separate active-low 3-state enable controls per channel. Its CMOS input structure supports overvoltage tolerance (VI ≤ 5.5 V), while balanced push-pull outputs deliver symmetrical sourcing/sinking capability up to ±24 mA at 3.3 V.

Designed for partial-power-down operation, the device integrates Ioff circuitry that disables outputs and limits leakage to ±10 µA when VCC = 0 V, preventing back-drive current. Input transition rate requirements (Δt/Δv ≤ 10 ns/V at 3.3 V) ensure reliable switching without oscillation in high-speed routing environments.

Key Specifications

Pinout & Package

VSSOP-8 (DCU) package: 2.30 mm × 2.00 mm body, 0.5-mm lead pitch, exposed pad optional, RoHS-compliant, moisture sensitivity level (MSL) 1 (unlimited reflow).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2G126DCUR, 74LVC2G125DCUTE4 avoids unintended signal inversion in timing-critical paths; compared with 74LVC2G125DCTR, it delivers superior thermal performance and smaller footprint in space-constrained SSD and radar modules.

Availability

74LVC2G125DCUTE4 is available at Aetrix Electronics and suitable for cable modem termination systems, SSD internal interconnects, and military radar signal processing requiring stable component supply, long-term lifecycle assurance, and traceable RoHS-compliant sourcing.

Supply support for 74LVC2G125DCUTE4 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 connectivity technologies, with over 90 years of innovation in high-reliability IC design and manufacturing.

The SN74LVC2G125 family delivers ultra-small-footprint, high-drive 3-state logic for voltage translation and bus isolation in space-constrained, high-speed digital systems - targeting SSDs, communications infrastructure, and industrial control.

FAQ

What is the maximum operating temperature for the 74LVC2G125DCUTE4?

The 74LVC2G125DCUTE4 is rated for continuous operation from –40°C to +125°C ambient temperature. This extended range is validated per JEDEC JESD22-A108 and supports deployment in under-hood automotive, industrial motor drives, and outdoor telecom equipment where thermal margins are critical. The VSSOP-8 package's RθJA of 217.8°C/W enables reliable performance within this envelope when proper PCB copper area and airflow are maintained.

Does the 74LVC2G125DCUTE4 support level translation between different supply voltages?

Yes, the 74LVC2G125DCUTE4 supports down-translation: its inputs tolerate up to 5.5 V regardless of VCC setting, allowing 5-V signals to safely drive the device while VCC operates at 1.8 V, 2.5 V, or 3.3 V. However, it does not perform up-translation - output swing is limited to VCC, so driving a 5-V bus requires VCC = 5 V. This makes 74LVC2G125DCUTE4 ideal for interfacing legacy 5-V peripherals to modern low-voltage controllers.

How should unused inputs be handled on the 74LVC2G125DCUTE4?

All unused inputs on the 74LVC2G125DCUTE4 - including 1A, 2A, 1OE, and 2OE - must be actively terminated to either VCC or GND using resistors (typically 10 kΩ pull-up/pull-down). Floating CMOS inputs cause undefined logic states, increased ICC, and potential oscillation due to noise coupling. TI's SCBA004 application note confirms that uncontrolled input bias violates recommended operating conditions and risks functional failure in production systems using the 74LVC2G125DCUTE4.

What is the purpose of the Ioff feature in the 74LVC2G125DCUTE4?

The Ioff feature in the 74LVC2G125DCUTE4 disables all outputs and limits input/output leakage to ±10 µA when VCC = 0 V, preventing damaging back-current flow during hot-plug or partial-power-down events. This is essential in modular systems like CMTS line cards or SSD expansion modules, where 74LVC2G125DCUTE4 may remain connected to live backplanes while its local supply is off - protecting both the buffer and upstream logic from latch-up or overstress.

Can the 74LVC2G125DCUTE4 drive standard LED loads directly?

The 74LVC2G125DCUTE4 can drive low-current indicator LEDs (≤10 mA) in sink or source configuration at 3.3 V, leveraging its ±24-mA output capability. However, it is not optimized for sustained high-current LED biasing: continuous DC loading exceeds recommended operating limits, and thermal dissipation in the VSSOP-8 package becomes limiting above ~15 mA per output. For dedicated LED driving, TI recommends pairing 74LVC2G125DCUTE4 with discrete FETs or using purpose-built LED drivers instead.