Texas Instruments SN74LVC1G125YZAR

Overview

SN74LVC1G125 from Texas Instruments is a single 3-state bus buffer gate used for signal isolation and controlled data routing on low-voltage digital buses. It features true non-inverting logic, 3.3V/5V supply compatibility (1.65–5.5V), ±24mA output drive at 3.3V, 3.7ns max propagation delay, and Ioff support for live insertion in partial-power-down systems.

For engineers reviewing the SN74LVC1G125 datasheet, SN74LVC1G125 pinout, SN74LVC1G125 application, or SN74LVC1G125 equivalent, key selection considerations include its ultra-small DPW (X2SON-5) package (0.8mm × 0.8mm), over-voltage tolerant inputs (up to 5.5V), down-translation capability, and robust ESD ratings (2000V HBM).

Technical Context

The SN74LVC1G125 implements a CMOS-based non-inverting buffer with active-low 3-state enable control (OE). Its output enters high-impedance when OE is high, and passes A→Y when OE is low - enabling bidirectional bus sharing and load isolation. The device uses standard CMOS inputs with input transition rate limits (5 ns/V at 5V) and includes clamp diodes only on negative side.

It supports mixed-voltage interfacing via over-voltage tolerant inputs (VI up to 5.5V independent of VCC) and down-translation: a 5V input signal can safely drive the device while operating from a 3.3V or 1.8V supply, with output levels referenced to VCC. Ioff functionality ensures zero current flow at outputs during VCC = 0V, preventing back-drive in powered-down subsystems.

Key Specifications

Pinout & Package

SN74LVC1G125YZAR is packaged in the ultra-compact DPW (X2SON-5) package: 0.8mm × 0.8mm body, 0.5mm pitch, no exposed pad. This 5-pin monolithic silicon die-level package enables ultra-dense PCB layouts in space-constrained applications such as portable SSDs and compact video transcoders.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G125YZAR, the Nexperia 74LVC1G125GW offers identical functionality in a larger SC-70 package, while the ON Semi NC7SZ125P5X matches footprint and speed but provides lower ESD robustness - making SN74LVC1G125YZAR optimal for ultra-compact, high-reliability designs requiring maximum HBM immunity and minimal board area.

Availability

SN74LVC1G125YZAR is available at Aetrix Electronics and suitable for cable modem termination systems, SSD internal bus interfaces, video IP-based transcoders, military radar signal processing, and high-speed data acquisition requiring stable component supply across extended temperature ranges.

Supply support for SN74LVC1G125YZAR 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 experience in high-reliability interface IC design.

The SN74LVC1G125 belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for low-power, mixed-voltage interoperability in space- and power-constrained digital systems - particularly targeting communications infrastructure, storage, and industrial control.

FAQ

What is the recommended pullup resistor value for OE on SN74LVC1G125YZAR?

The OE pin should be tied to VCC through a pullup resistor to ensure high-impedance state during power-up. TI specifies the minimum resistor value based on the driver's current-sinking capability. For SN74LVC1G125YZAR, a 10kΩ resistor is recommended - it guarantees reliable disable behavior while minimizing static current draw and accommodating typical MCU GPIO sink strength (≥4mA).

Can SN74LVC1G125YZAR interface a 5V sensor output with a 1.8V microcontroller input?

Yes - SN74LVC1G125YZAR accepts input voltages up to 5.5V regardless of VCC, enabling direct connection of 5V sensor outputs. When powered from 1.8V, it down-translates the signal and outputs logic levels compatible with 1.8V CMOS inputs (VOH ≥ 1.7V, VOL ≤ 0.1V per datasheet), making SN74LVC1G125YZAR ideal for bridging legacy and low-voltage domains without external level shifters.

Does SN74LVC1G125YZAR support hot-swap or live-insertion applications?

Yes - SN74LVC1G125YZAR includes Ioff circuitry that disables all outputs when VCC = 0V, preventing current backflow and latch-up during partial power-down. This feature, combined with ±10μA max Ioff current, makes SN74LVC1G125YZAR suitable for hot-plug modules in cable modems and modular video infrastructure where subsystems may power up/down independently.

What is the maximum capacitive load SN74LVC1G125YZAR can drive while maintaining 3.7ns propagation delay?

SN74LVC1G125YZAR maintains its 3.7ns max tpd specification at CL = 15pF (per Section 5.6). At higher loads - up to 50pF - it still meets full datasheet performance (Section 8.2.1.1), though propagation delay increases (e.g., 4.5ns at 3.3V, CL = 30pF). For loads >50pF, TI recommends adding a series damping resistor to control edge rate and prevent ringing - a design consideration explicitly validated for SN74LVC1G125YZAR.

Is SN74LVC1G125YZAR pin-compatible with other 5-pin X2SON logic devices?

SN74LVC1G125YZAR uses the standard DPW (X2SON-5) footprint defined by JEDEC MO-302, with 0.5mm pitch and 0.8mm × 0.8mm body. It shares mechanical compatibility with other TI X2SON-5 logic devices (e.g., SN74LVC1G00YZPR, SN74LVC1G08YZPR), allowing layout reuse across buffer, gate, and inverter functions - though electrical functionality and pin assignments differ and must be verified per device.