Texas Instruments SN74LVC1G125YEAR

Overview

SN74LVC1G125YEAR from Texas Instruments is a single-channel 3-state bus buffer gate with true (non-inverting) logic, designed for voltage-level translation and bus isolation in space-constrained digital systems. It operates from 1.65V to 5.5V VCC, accepts inputs up to 5.5V, delivers ±24mA output drive at 3.3V, and achieves 3.7ns max propagation delay at 3.3V - enabling use in high-speed data acquisition and SSD interconnects.

For engineers reviewing the SN74LVC1G125YEAR datasheet, SN74LVC1G125YEAR pinout, SN74LVC1G125YEAR application, or SN74LVC1G125YEAR equivalent, key selection criteria include its Ioff-enabled live insertion capability, over-voltage tolerant inputs, ultra-small X2SON-5 (DPW) package footprint (0.8mm × 0.8mm), and guaranteed 3-state behavior during power sequencing.

Technical Context

The SN74LVC1G125YEAR implements a CMOS-based non-inverting buffer with active-low 3-state control (OE). Its functional mode is strictly defined by OE: low enables A→Y pass-through; high forces Y into high-impedance. The device uses standard CMOS inputs with input transition rate limits (5 ns/V at 5V) and features balanced push-pull outputs capable of sourcing/sinking equal current.

It integrates partial-power-down protection (Ioff) that disables all outputs when VCC = 0V, limiting leakage to ±10μA. Input clamping diodes are present only on the negative side, and over-voltage tolerance (up to 5.5V) is achieved without positive clamp diodes - critical for mixed-voltage interfacing where 3.3V logic drives 5V-bus systems.

Key Specifications

Pinout & Package

SN74LVC1G125YEAR is packaged in the ultra-compact X2SON-5 (DPW) package: 0.8mm × 0.8mm body, 0.5mm pitch, no exposed pad. This 5-pin monolithic layout minimizes PCB area while maintaining thermal performance (RθJA = 340°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC1G125YEAR, SN74LVC1G125DBVR offers superior thermal management in sustained-output scenarios, while NC7SZ125P5X provides marginally faster timing in a slightly larger but more widely supported package - neither is pin-compatible, requiring PCB redesign for substitution.

Availability

SN74LVC1G125YEAR is available at Aetrix Electronics and suitable for high-speed data acquisition, SSD internal interconnects, and video broadcasting infrastructure requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for SN74LVC1G125YEAR 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 heritage in high-reliability industrial and automotive-grade components.

The SN74LVC1G125YEAR belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for low-power, mixed-voltage interfacing in space-constrained, thermally demanding applications such as communications infrastructure and storage systems.

FAQ

What is the recommended pull-up resistor value for OE on SN74LVC1G125YEAR?

The OE pin of SN74LVC1G125YEAR should be pulled up to VCC to ensure high-impedance state during power-up. A 10kΩ resistor is recommended - it balances reliable pull-up strength against minimal current draw (≤0.5mA at 5V) and avoids compromising rise time. Lower values (e.g., 4.7kΩ) may be used if fast OE deassertion is required, provided the driver can sink the resulting current.

Can SN74LVC1G125YEAR interface a 3.3V microcontroller with a 5V peripheral bus?

Yes. SN74LVC1G125YEAR supports 5.5V-tolerant inputs regardless of VCC, so a 3.3V-powered SN74LVC1G125YEAR can safely accept 5V signals from peripherals. When VCC = 3.3V, its outputs swing rail-to-rail (0V to 3.3V), making it ideal for unidirectional 5V→3.3V level translation - just ensure OE is controlled by the 3.3V domain.

Does SN74LVC1G125YEAR require external decoupling capacitors?

Yes. A 0.1μF ceramic capacitor must be placed between VCC and GND, located as close as possible to the SN74LVC1G125YEAR pins. This suppresses high-frequency noise and transient current spikes during switching. For enhanced noise immunity, add a 1μF capacitor in parallel - both must use short, wide traces to minimize inductance.

What is the maximum capacitive load SN74LVC1G125YEAR can drive while meeting datasheet timing specs?

SN74LVC1G125YEAR guarantees switching characteristics (e.g., 3.7ns tpd) up to 15pF load capacitance. For 30–50pF loads, timing remains functional but degrades (e.g., 4.5ns max tpd at 3.3V, CL = 30pF). Loads >50pF require series damping resistors to prevent ringing - TI recommends limiting total load to ≤50pF for full spec compliance.

Is SN74LVC1G125YEAR suitable for automotive applications?

SN74LVC1G125YEAR is rated for –40°C to +125°C operation and meets JESD78 Class II latch-up immunity (>100mA), making it suitable for under-hood and infotainment applications. However, it is not AEC-Q200 qualified. For automotive production, verify qualification status with TI and consider AEC-Q200 variants like SN74LVC1G125QDBVRQ1 if required.