Texas Instruments SN74LVC2G240YEAR

Overview

SN74LVC2G240YEAR from Texas Instruments is a dual 1-bit noninverting buffer/driver with independent 3-state outputs, designed for 1.65-V to 5.5-V VCC operation. It supports 5-V tolerant inputs (up to 5.5 V), delivers ±24-mA output drive at 3.3 V, achieves 4.6-ns max propagation delay at 3.3 V, and features Ioff for live insertion and partial-power-down protection - used in memory address buffering, clock distribution, and bus interface applications.

For engineers reviewing the SN74LVC2G240YEAR datasheet, SN74LVC2G240YEAR pinout, SN74LVC2G240YEAR application, or SN74LVC2G240YEAR equivalent, key selection criteria include voltage translation capability (5.5-V input → VCC-level output), low ground bounce (<0.8 V at 3.3 V), high-impedance state control via separate OE pins, and NanoFree™ package compatibility for ultra-dense PCB layouts.

Technical Context

This device implements two independent noninverting buffer channels, each with dedicated output-enable (OE) control logic. Each channel passes A→Y when OE is low and enters high-impedance when OE is high - no internal inversion or latching occurs. The Ioff circuitry actively disables outputs during power-down, blocking back-drive current even when VCC = 0 V.

It operates across 1.65–5.5 V supply range with rail-to-rail input tolerance (VI up to 5.5 V), enabling down-translation from higher-voltage domains. Output drive strength scales with VCC: ±24 mA at 3.3 V, ±32 mA at 4.5 V, and maintains <0.55-V VOL at 24-mA sink under 3-V conditions.

Key Specifications

Pinout & Package

SN74LVC2G240YEAR is available in DCT (SSOP-8), DCU (VSSOP-8), and YZP (DSBGA-8) packages. All variants share identical 8-pin functional mapping and pin-compatible layout per TI mechanical drawings SCES208I.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC2G240YEAR, SN74LVC2G125YEAR reduces control flexibility but lowers BOM cost, while 74LVC2G241DCUR preserves timing and drive performance but mandates redesign for inverted logic flow - neither offers pin-for-pin replacement without schematic or firmware adjustment.

Availability

SN74LVC2G240YEAR is available at Aetrix Electronics and suitable for memory address buffering, clock distribution, and bus interface applications requiring stable component supply across automotive, industrial, and communications end markets.

Supply support for SN74LVC2G240YEAR 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, embedded processing, and connectivity technologies, with over 90 years of innovation in high-reliability silicon design.

The SN74LVC2G240YEAR belongs to TI's LVC logic family - engineered for low-voltage operation, mixed-signal interoperability, and robustness in space-constrained, thermally demanding embedded systems.

FAQ

What is the maximum input voltage rating for SN74LVC2G240YEAR?

The SN74LVC2G240YEAR supports input voltages up to 5.5 V regardless of VCC level, enabling direct interfacing with 5-V logic sources while operating from as low as 1.65 V. This specification is guaranteed per Absolute Maximum Ratings table in SCES208I, with VI ≤ 5.5 V defined as safe under all operating conditions including power-down states.

Does SN74LVC2G240YEAR support independent 3-state control for each buffer channel?

Yes, SN74LVC2G240YEAR provides fully independent 3-state control via dedicated 1OE and 2OE inputs. When 1OE is low, 1Y follows 1A; when high, 1Y enters high-impedance. Same applies separately to 2A/2Y/2OE. This is confirmed in the Function Table and Logic Diagram of the official datasheet SCES208I.

Can SN74LVC2G240YEAR be used for voltage level translation?

Yes, SN74LVC2G240YEAR functions as a down-translator: inputs tolerate up to 5.5 V while outputs swing between 0 and VCC (1.65–5.5 V). For example, a 5-V input signal produces a clean 3.3-V output when VCC = 3.3 V - explicitly stated in the FEATURES section of SCES208I as "Can Be Used as a Down Translator."

What thermal performance can be expected from SN74LVC2G240YEAR in the DCU package?

In the DCU (VSSOP-8) package, SN74LVC2G240YEAR has a θJA of 227°C/W per JEDEC JESD51-7. At 24-mA output load and 3.3-V VCC, typical power dissipation is ~17 mW per buffer, resulting in <4°C junction rise above ambient - verified in Operating Characteristics table on page 5 of SCES208I.

Is SN74LVC2G240YEAR compatible with lead-free reflow processes?

Yes, SN74LVC2G240YEAR variants carry MSL Level-1 rating with peak reflow temperature of 260°C, compliant with IPC/JEDEC J-STD-020. All listed packages (DCT, DCU, YZP) use lead-free terminations - NIPDAU/SN or SNAGCU - and are qualified for standard Pb-free soldering profiles without preconditioning.