Texas Instruments SN74LVC2G125DCUT

Overview

SN74LVC2G125DCUT from Texas Instruments is a dual non-inverting bus buffer gate with 3-state outputs, designed for 1.65-V to 5.5-V V_CC operation. It features two independent channels (1A→1Y, 2A→2Y), each controlled by its own active-low output-enable input (1OE, 2OE), delivering ±24-mA drive at 3.3 V, 4.3-ns max propagation delay, and I_off support for live insertion in partial-power-down systems - used in high-speed data acquisition and SSD interconnects.

For engineers reviewing the SN74LVC2G125DCUT datasheet, SN74LVC2G125DCUT pinout, SN74LVC2G125DCUT application, or SN74LVC2G125DCUT equivalent, key selection considerations include 3-state bus isolation capability, overvoltage-tolerant inputs up to 5.5 V, nanosecond-level timing performance across 1.65–5.5 V supply range, and NanoFree™ package compatibility with space-constrained PCB layouts.

Technical Context

The SN74LVC2G125DCUT implements two independent CMOS non-inverting buffers, each with active-low 3-state control logic. Its I_off circuitry ensures outputs enter high-impedance state during power-down, blocking back-drive current even when V_CC = 0 V. Inputs tolerate voltages up to 5.5 V regardless of V_CC, enabling level translation from higher-voltage domains down to the local supply rail.

It uses balanced push-pull output stages capable of sourcing and sinking equal current (±24 mA at 3.3 V), supporting fast edge rates (≤10 ns/V input transition) and low ground bounce (<0.8 V typical VOLP). The device operates across –40°C to +125°C and meets JESD 78 Class II latch-up immunity (>100 mA).

Key Specifications

Pinout & Package

SN74LVC2G125DCUT is packaged in an 8-pin VSSOP (DCU) package measuring 2.30 mm × 2.00 mm, with exposed pad not present and lead finish NIPDAU. This ultra-small outline package supports fine-pitch routing and automated assembly in compact embedded systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2G125DCUT, SN74LVC2G126DCUR offers identical timing and drive but inverted logic, while 74LVC2G125GW,125 matches functionality but demands thermal redesign due to 46% higher junction-to-ambient resistance - making SN74LVC2G125DCUT optimal for thermally constrained, high-reliability VSSOP layouts.

Availability

SN74LVC2G125DCUT is available at Aetrix Electronics and suitable for high-speed data acquisition, SSD interconnects, and video broadcasting infrastructure requiring stable component supply, extended temperature operation, and consistent NanoFree™ packaging.

Supply support for SN74LVC2G125DCUT 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 specializing in analog and embedded processing technologies, with leadership in precision analog, power management, and high-speed logic solutions.

The SN74LVC2G125DCUT belongs to TI's LVC (Low-Voltage CMOS) logic family, engineered for low-voltage, high-speed, and robust interface applications in industrial, communications, and computing systems.

FAQ

What is the maximum operating temperature for the SN74LVC2G125DCUT?

The SN74LVC2G125DCUT is fully specified from –40°C to +125°C ambient temperature. Its electrical characteristics, including propagation delay, output drive, and I_off, are guaranteed across this full industrial temperature range - making it suitable for under-hood automotive modules and industrial motor drives where thermal margins are critical. The device's R_θJA of 217.8°C/W (VSSOP) must be considered in thermal design.

Does the SN74LVC2G125DCUT support level translation between different voltage domains?

Yes, the SN74LVC2G125DCUT supports down-translation: its inputs accept voltages up to 5.5 V regardless of V_CC, allowing 5-V signals to safely drive the device while operating at 1.8 V or 3.3 V. However, it does not perform up-translation - outputs swing only between GND and the applied V_CC. This makes SN74LVC2G125DCUT ideal for interfacing legacy 5-V peripherals to modern low-voltage controllers.

How should the OE pins be handled during power-up to ensure reliable 3-state behavior?

To guarantee high-impedance outputs during power-up or power-down, each OE pin (1OE and 2OE) must be tied to V_CC via an external pull-up resistor. TI specifies no minimum resistance value, but the resistor must be sized to stay within the current-sinking capability of the driving source - typically ≤10 kΩ for microcontroller GPIOs. Leaving OE floating risks undefined output states and potential bus contention.

Can the SN74LVC2G125DCUT be used in hot-swap applications?

Yes - the SN74LVC2G125DCUT supports live insertion via its I_off feature. When V_CC = 0 V, leakage current into or out of any I/O pin is limited to ±10 µA, preventing damaging back-current from powered backplanes or neighboring circuits. This enables safe insertion into live systems such as modular SSD carriers or field-replaceable telecom line cards - provided OE is held inactive (HIGH) before power application.

What is the recommended bypass capacitor for the V_CC pin of the SN74LVC2G125DCUT?

Texas Instruments recommends a 0.1-µF ceramic bypass capacitor placed as close as possible to the V_CC pin of the SN74LVC2G125DCUT. For systems with multiple V_CC pins or high-frequency noise, paralleling a 1-µF capacitor improves low-frequency decoupling. The capacitor must be X7R or better dielectric, rated ≥6.3 V, and mounted with minimal trace length to maintain low ESL and suppress supply transients caused by fast output switching.