Texas Instruments SN74LVC2G125YEPR

Overview

SN74LVC2G125YEPR from Texas Instruments is a dual 3-state bus buffer gate operating from 1.65 V to 5.5 V, featuring two independent noninverting buffers with active-low output-enable (OE) inputs, ±24-mA drive strength at 3.3 V, 4.3 ns max propagation delay, and Ioff partial-power-down support - used in voltage-level-translating data buses between mixed-supply subsystems in portable and space-constrained electronics.

For engineers reviewing the SN74LVC2G125YEPR datasheet, SN74LVC2G125YEPR pinout, SN74LVC2G125YEPR application, or SN74LVC2G125YEPR equivalent, key selection criteria include 3-state bus isolation capability, 5.5-V-tolerant inputs, ultra-small WCSP package footprint, low ICC (10 µA max), and compatibility with 1.8-V/2.5-V/3.3-V/5-V logic domains.

Technical Context

This device implements two identical noninverting buffer channels, each controlled by a dedicated active-low OE input that forces the corresponding Y output into high-impedance when asserted. The Ioff circuitry ensures no current backflow during partial power-down, enabling safe hot-insertion in multi-rail systems.

All inputs tolerate up to 5.5 V regardless of VCC, supporting bidirectional level translation without external biasing. Output drive strength scales with supply voltage: ±24 mA at 3.3 V, ±32 mA at 4.5 V, with VOL ≤ 0.55 V and VOH ≥ VCC – 0.1 V under full load.

Key Specifications

Pinout & Package

SN74LVC2G125YEPR uses an 8-pin NanoFree™ WCSP (YEP) package - 0.23-mm large solder bump, bottom-side ball layout, 1.2 mm × 1.2 mm footprint, 0.5-mm pitch - optimized for ultra-dense PCB layouts and minimal parasitic inductance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2G125YEPR, SN74LVC2G126YEPR provides identical performance with inverted outputs - useful for complementary signaling - while SN74LVC1G125DCKR offers single-channel flexibility in a less space-efficient package, making it suitable for simpler enable-gating tasks rather than dual-bus management.

Availability

SN74LVC2G125YEPR is available at Aetrix Electronics and suitable for mobile baseband interfaces, industrial sensor hubs, USB-C power delivery negotiation, and automotive infotainment debug ports requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant sourcing.

Supply support for SN74LVC2G125YEPR 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 over 90 years of innovation in high-reliability silicon design.

SN74LVC2G125YEPR belongs to TI's LVC logic family - engineered for low-voltage, high-speed, mixed-supply interoperability in portable, industrial, and automotive electronics where space, power, and signal integrity are critical.

FAQ

What is the function of the OE pins on SN74LVC2G125YEPR?

The SN74LVC2G125YEPR features two active-low output-enable (OE) inputs - 1OE and 2OE - each controlling the 3-state output of its respective buffer channel. When OE is low, the corresponding Y output follows the A input; when OE is high, the output enters high-impedance mode. This enables dynamic bus sharing and prevents signal contention in multi-driver systems. The SN74LVC2G125YEPR datasheet specifies that OE should be pulled up to VCC during power-up to guarantee Hi-Z initialization.

Does SN74LVC2G125YEPR support 5-V logic inputs while powered from 1.8 V?

Yes, SN74LVC2G125YEPR supports input voltages up to 5.5 V regardless of VCC level - including operation at 1.8 V supply. This allows direct interfacing with 5-V peripherals without external level shifters. The SN74LVC2G125YEPR input structure includes clamping diodes and is rated for VI = –0.5 V to 6.5 V, making it ideal for mixed-voltage domain bridging in battery-powered devices.

What is the thermal resistance (θJA) of SN74LVC2G125YEPR in its YEP package?

The SN74LVC2G125YEPR in the YEP NanoFree™ WCSP package has a junction-to-ambient thermal resistance (θJA) of 102°C/W, per TI's SCES204L datasheet. This value is measured under JEDEC JESD 51-7 conditions and reflects the package's superior heat dissipation relative to DCT (220°C/W) and DCU (227°C/W) variants - critical for thermal management in sealed or high-density portable enclosures where the SN74LVC2G125YEPR is commonly deployed.

Can SN74LVC2G125YEPR be used in partial-power-down applications?

Yes, SN74LVC2G125YEPR includes Ioff circuitry that disables all outputs and blocks current backflow when VCC = 0 V, meeting JESD 78 Class II latch-up requirements. This feature makes the SN74LVC2G125YEPR suitable for hot-swap, battery-backup, and multi-rail systems where subsystems power up/down independently - such as FPGA configuration buses or modular sensor nodes where the SN74LVC2G125YEPR isolates powered and unpowered sections.

What is the maximum output drive strength of SN74LVC2G125YEPR at 3.3 V?

At VCC = 3.3 V, SN74LVC2G125YEPR delivers ±24 mA output drive strength - specifically –24 mA for IOH (high-level source current) and +24 mA for IOL (low-level sink current). This is verified in the Electrical Characteristics table of the SN74LVC2G125YEPR datasheet and enables direct driving of multiple 74LVC inputs or short PCB traces without external buffering, supporting robust signal integrity in compact designs.