Texas Instruments SN74LVC2G125YZAR

Overview

SN74LVC2G125YZAR from Texas Instruments is a dual 3-state bus buffer gate operating from 1.65 V to 5.5 V, featuring ±24-mA output drive at 3.3 V, 4.3 ns max propagation delay, and Ioff support for partial-power-down mode. It enables bidirectional data isolation in low-voltage digital interfaces such as I²C level-shifting, memory address buffering, and FPGA I/O expansion.

For engineers reviewing the SN74LVC2G125YZAR datasheet, SN74LVC2G125YZAR pinout, SN74LVC2G125YZAR application, or SN74LVC2G125YZAR equivalent, key selection criteria include its NanoFree™ WCSP package (YZA), 3.3-V/5-V tolerant inputs, rail-to-rail output swing, and guaranteed high-impedance state during power sequencing.

Technical Context

This device implements two independent noninverting buffers, each with an active-low output-enable (OE) control. When OE is high, the output enters high-impedance (Hi-Z) state; when low, the output follows the input (A → Y). The logic diagram confirms positive-logic operation with no inversion.

It supports mixed-voltage system interfacing: inputs accept up to 5.5 V regardless of VCC, enabling safe connection to 5-V buses while powered from 1.8-V or 3.3-V rails. The Ioff circuitry blocks current flow when VCC = 0 V, preventing backdrive damage during hot insertion or partial power-down.

Key Specifications

Pinout & Package

NanoFree™ WCSP (YZA) package: 8-bump, 0.4-mm pitch, 1.3-mm × 0.9-mm footprint, Pb-free solder bumps, bottom-side marked "YZA" with pin-1 indicator (• = Pb-free).

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2G125YZAR, SN74LVC2G126YZAR offers functional equivalence with inverted logic, while SN74AUP2G125DSFR trades speed for extreme low-power operation - neither is pin-compatible nor drop-in; both require logic review and layout verification.

Availability

SN74LVC2G125YZAR is available at Aetrix Electronics and suitable for memory address buffering, I²C level translation, FPGA I/O expansion, and hot-swappable module interfaces requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for SN74LVC2G125YZAR 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 company delivering analog and embedded processing solutions, with leadership in logic, power management, and interface technologies since 1930.

The SN74LVC2G125YZAR belongs to TI's LVC logic family - designed for low-voltage, high-speed, mixed-signal interfacing in portable, industrial, and communications equipment where space, power, and voltage flexibility are critical.

FAQ

What is the maximum operating voltage for SN74LVC2G125YZAR?

The SN74LVC2G125YZAR supports a supply voltage range of 1.65 V to 5.5 V. Its absolute maximum rating is 6.5 V on VCC, but operation above 5.5 V is not guaranteed. Inputs tolerate up to 5.5 V regardless of VCC level, enabling robust mixed-voltage interfacing in systems with 5-V peripherals and sub-3.3-V controllers.

Does SN74LVC2G125YZAR support partial-power-down operation?

Yes, SN74LVC2G125YZAR includes Ioff circuitry that disables outputs and limits current to ±10 µA when VCC = 0 V. This prevents back-current flow from live inputs into an unpowered device - essential for hot-swap, multi-rail, or battery-backed systems where power domains sequence independently.

What package type is used for SN74LVC2G125YZAR?

SN74LVC2G125YZAR uses the NanoFree™ WCSP (Wafer Chip Scale Package) with YZA marking: an 8-bump, 0.4-mm pitch, 1.3-mm × 0.9-mm footprint. It features Pb-free solder bumps and a bottom-side pin-1 indicator (•), meeting IPC/JEDEC J-STD-020 moisture sensitivity Level-1.

Can SN74LVC2G125YZAR be used for level translation between 1.8-V and 3.3-V systems?

Yes, SN74LVC2G125YZAR is ideal for unidirectional level translation. Its 5.5-V-tolerant inputs allow 3.3-V signals to drive it while powered from 1.8 V, and its rail-to-rail outputs (VOH ≥ VCC – 0.1 V, VOL ≤ 0.1 V) deliver clean 1.8-V logic levels - eliminating external resistors or dedicated translators in many cases.

What is the propagation delay of SN74LVC2G125YZAR at 3.3 V?

At VCC = 3.3 V and TA = 25°C, SN74LVC2G125YZAR has a maximum propagation delay (tpd) of 4.3 ns. Typical values range from 1.4 ns to 4.3 ns depending on load and transition, supporting reliable operation in digital paths up to ~100 MHz with appropriate timing margins.