Texas Instruments SN74AUC1G125YZPR

Overview

SN74AUC1G125YZPR 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 operating range, and over-voltage tolerant I/Os up to 3.6 V - used to enable/disable or redrive high-speed digital signals in compact portable electronics.

For engineers reviewing the SN74AUC1G125YZPR datasheet, SN74AUC1G125YZPR pinout, SN74AUC1G125YZPR application, or SN74AUC1G125YZPR equivalent, key selection considerations include its NanoFree™ DSBGA-5 package (1.39 mm × 0.89 mm), Ioff partial-power-down support, ULTTL output structure for 50–65-Ω transmission line driving, and guaranteed 2.5-ns timing at 1.8 V.

Technical Context

The SN74AUC1G125YZPR implements a positive-logic noninverting buffer with active-low 3-state control (OE). Its ULTTL output driver dynamically adjusts impedance during signal transitions to minimize ringing and reflections on controlled-impedance lines ≤15 cm.

It supports 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 states and excessive power draw.

Key Specifications

Pinout & Package

SN74AUC1G125YZPR uses the Texas Instruments NanoFree™ DSBGA-5 (YZP) package - a 1.39 mm × 0.89 mm die-scale ball grid array where the silicon die serves as the mechanical package. This eliminates wirebonds and mold compound, reducing parasitic inductance and enabling ultra-thin (<0.5 mm) board-level integration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AUC1G125YZPR, SN74AUP1G125YZPR trades speed for nanoampere quiescent current, while 74LVC1G125GW,125 offers higher drive at 3.3 V but lacks 1.8-V timing optimization and NanoFree™ size - making SN74AUC1G125YZPR the only option meeting simultaneous requirements of sub-3-ns delay, 1.8-V operation, and 1.39-mm × 0.89-mm footprint.

Availability

SN74AUC1G125YZPR is available at Aetrix Electronics and suitable for mobile baseband interfaces, high-speed sensor data buses, USB Type-C sideband use (SBU), and low-power FPGA configuration interfaces requiring stable component supply and long-term production continuity.

Supply support for SN74AUC1G125YZPR 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 decades of innovation in high-speed logic and advanced packaging.

The SN74AUC1G125YZPR belongs to TI's AUC sub-1-V logic family - engineered specifically for speed and signal integrity in 1.8-V mobile and portable systems, leveraging ULTTL outputs and NanoFree™ packaging to eliminate traditional package parasitics.

FAQ

What is the maximum operating frequency supported by the SN74AUC1G125YZPR?

The SN74AUC1G125YZPR supports data rates exceeding 250 MHz under optimal conditions: 1.8-V supply, 15-pF load, and proper PCB layout. Its 2.5-ns max propagation delay at 1.8 V/30 pF enables reliable operation in 100–200 Mbps digital links, such as MIPI RFFE or high-speed sensor interfaces. Actual frequency depends on load capacitance, trace impedance, and signal integrity margins.

Does the SN74AUC1G125YZPR require external pull-up or pull-down resistors on its inputs?

Yes - all unused inputs of the SN74AUC1G125YZPR, including A and OE, must be terminated to either VCC or GND to prevent floating states. For OE, TI recommends tying to VCC via a pull-up resistor to ensure the output remains in high-impedance during power-up; the resistor value depends on system drive strength but 10 kΩ is commonly used and validated in TI application notes.

Can the SN74AUC1G125YZPR safely interface with 3.3-V logic signals?

Yes - the SN74AUC1G125YZPR features over-voltage tolerant I/Os rated to 3.6 V independent of VCC, allowing direct connection to 3.3-V peripherals even when powered from 1.8 V. This eliminates level shifters in mixed-voltage systems, provided output loading remains within ±8-mA drive capability at the target VCC.

What is the thermal resistance (RθJA) of the SN74AUC1G125YZPR in its YZP package?

The SN74AUC1G125YZPR in the NanoFree™ DSBGA-5 (YZP) package has a junction-to-ambient thermal resistance (RθJA) of 144.5°C/W, significantly lower than SOT-23 (220.7°C/W) and SC70 (262.5°C/W) variants. This improved thermal performance results from direct die-to-PCB conduction through solder balls and enables higher sustained drive capability in thermally constrained layouts.

How does the Ioff feature of the SN74AUC1G125YZPR protect downstream components during power-down?

The Ioff feature in the SN74AUC1G125YZPR disables all outputs and limits leakage current to ±10 µA when VCC = 0 V, preventing back-driving of powered circuits connected to Y or A/OE pins. This protects sensitive downstream ICs - such as powered FPGAs or microcontrollers - from unintended current injection during partial power-down sequences or hot-swap events.