Texas Instruments 74AUC1G125DBVRE4

Overview

74AUC1G125DBVRE4 from Texas Instruments is a single 3-state bus buffer gate optimized for 1.8-V operation, delivering ±8-mA output drive, 2.5-ns max propagation delay at 1.8 V/30 pF, 0.8–2.7-V supply range, and over-voltage tolerant I/Os up to 3.6 V. It serves as a high-speed signal redriver in compact digital interfaces such as memory expansion buses and low-voltage FPGA I/O conditioning.

For engineers reviewing the 74AUC1G125DBVRE4 datasheet, 74AUC1G125DBVRE4 pinout, 74AUC1G125DBVRE4 application, or 74AUC1G125DBVRE4 equivalent, key selection criteria include its NanoFree™-compatible SOT-23 package, Ioff-enabled partial power-down capability, ULTTL output structure for 50–65-Ω transmission line driving, and guaranteed operation down to 0.8 V for ultra-low-power systems.

Technical Context

The 74AUC1G125DBVRE4 implements a noninverting 3-state buffer with active-low output enable (OE), where Y follows A when OE is low and enters high-impedance state when OE is high. Its ULTTL output architecture provides matched source/sink strength and dynamic impedance control during transitions to suppress ringing on short (<15 cm) controlled-impedance lines.

It supports true partial power-down via Ioff circuitry that disables outputs and limits back-drive current when VCC = 0 V, while standard CMOS inputs require termination to VCC or GND to prevent floating-induced oscillation or excess power draw. The device operates across –40°C to +85°C and meets JESD78 Class II latch-up immunity (>100 mA).

Key Specifications

Pinout & Package

SOT-23-5 (DBV) package: 2.90 mm × 1.60 mm body, 5-pin surface-mount, lead-free (NIPDAU), moisture sensitivity level 1 (260°C reflow unlimited).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar bus buffer applications.

Compared with SN74LVC1G125DBVR and 74AUP1G125GW,125, the 74AUC1G125DBVRE4 uniquely delivers sub-1-V operation, 3.6-V I/O tolerance, and ULTTL signal integrity-making it the only choice for ultra-low-voltage, mixed-rail, and high-speed trace-driven applications.

Availability

74AUC1G125DBVRE4 is available at Aetrix Electronics and suitable for high-speed memory interfaces, FPGA I/O conditioning, USB 2.0 signal routing, and industrial sensor bus gating requiring stable component supply across automotive, industrial, and consumer production programs.

Supply support for 74AUC1G125DBVRE4 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 high-performance, low-power IC design.

The SN74AUC1G125 belongs to TI's AUC (Advanced Ultra-low-voltage CMOS) logic family, engineered specifically for speed and signal integrity in sub-2-V digital systems - targeting portable, battery-powered, and high-density interconnect applications.

FAQ

What is the maximum operating frequency supported by the 74AUC1G125DBVRE4?

The 74AUC1G125DBVRE4 supports data rates up to 500 Mbps under optimal conditions (1.8 V, 15-pF load), corresponding to a maximum toggle frequency near 250 MHz. This is enabled by its 2.5-ns max propagation delay at 1.8 V/30 pF and ULTTL output structure designed for clean edge transitions on controlled-impedance lines.

Does the 74AUC1G125DBVRE4 require external pull-up or pull-down resistors on unused inputs?

Yes - all unused inputs of the 74AUC1G125DBVRE4 must be terminated to either VCC or GND to prevent floating, which can cause excessive power consumption or oscillation. A 10-kΩ resistor is recommended per TI's layout guidelines, especially for OE or A when not actively driven.

Can the 74AUC1G125DBVRE4 safely interface with 3.3-V logic signals?

Yes - the 74AUC1G125DBVRE4 features over-voltage tolerant I/Os rated to 3.6 V independent of VCC, allowing direct connection to 3.3-V peripherals without level shifters or clamping diodes, provided VCC remains within 0.8–2.7 V and absolute maximum ratings are observed.

What is the thermal resistance (RθJA) of the 74AUC1G125DBVRE4 in its SOT-23 package?

The 74AUC1G125DBVRE4 in DBV (SOT-23-5) package has a junction-to-ambient thermal resistance (RθJA) of 220.7°C/W, measured under standard JEDEC test conditions. This value assumes a two-layer board with 1-in² copper pour; actual thermal performance improves with enhanced PCB copper area or thermal vias.

How does the Ioff feature of the 74AUC1G125DBVRE4 protect downstream circuitry during power-down?

The Ioff feature in the 74AUC1G125DBVRE4 disables all outputs and limits leakage current to ±10 µA when VCC = 0 V, preventing damaging back-drive current from powered sections into unpowered logic. This ensures safe multi-rail power sequencing and protects connected devices during hot-swap or partial shutdown events.