Nexperia USA Inc. 74LVC240AD,112

Overview

74LVC240AD,112 from Nexperia is an octal inverting 3-state buffer/line driver with dual independent output enables (1OE, 2OE), 1.2 V to 3.6 V supply operation, 5.5 V tolerant inputs/outputs, and Schmitt-trigger inputs for noise immunity. It supports mixed-voltage translation between 3.3 V and 5 V systems and is rated for operation from −40 °C to +125 °C in SO20 (SOT163-1) package.

For engineers reviewing the 74LVC240AD,112 datasheet, 74LVC240AD,112 pinout, 74LVC240AD,112 application, or 74LVC240AD,112 equivalent, this device is selected for high-noise industrial bus buffering, level-shifting I/O expansion, and partial-power-down–capable peripheral interfacing where IOFF protection and rail-to-rail input tolerance are required.

Technical Context

The 74LVC240AD implements two independent 4-bit inverting buffer groups, each controlled by its own active-low output enable (1OE for outputs 1Y0–1Y3; 2OE for 2Y0–2Y3). All inputs feature Schmitt-trigger action, enabling robust operation with slow-rising signals and reducing susceptibility to noise-induced switching.

Its IOFF circuitry actively disables outputs when VCC = 0 V, blocking backflow current during partial power-down-critical for hot-swap and power-gated subsystems. Input voltage tolerance up to 5.5 V allows direct connection to 5 V logic without external level shifters, while output drive strength reaches ±24 mA at 3.0 V.

Key Specifications

Pinout & Package

74LVC240AD,112 is supplied in a plastic small outline package (SO20, SOT163-1) with 20 leads and 7.5 mm body width. The package is RoHS-compliant, lead-free, and rated for reflow soldering per JEDEC J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74LVC240APWR and 74LVC240ABQ,115, the 74LVC240AD,112 offers the highest creepage distance and easiest hand-solderability in SO20, making it preferred for prototyping, industrial repair, and applications requiring mechanical robustness over ultra-compact footprint.

Availability

74LVC240AD,112 is available at Aetrix Electronics and suitable for industrial bus buffering, microcontroller I/O expansion, memory address latching, and legacy peripheral interface requiring stable component supply across extended temperature and mixed-voltage environments.

Supply support for 74LVC240AD,112 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

Nexperia is a global semiconductor expert delivering high-performance logic, analog, and MOSFET solutions optimized for efficiency, reliability, and miniaturization in industrial, automotive, and consumer applications.

The 74LVC240A series belongs to Nexperia's advanced LVC logic family, designed specifically for low-voltage, high-noise-immunity digital interfacing in mixed-supply systems where voltage translation, power sequencing safety, and wide ambient operation are critical.

FAQ

Can 74LVC240AD,112 operate with a 1.2 V supply and still accept 5 V inputs?

Yes. The device is fully specified from 1.2 V to 3.6 V supply and features overvoltage-tolerant inputs rated to 5.5 V. At VCC = 1.2 V, inputs can swing from −0.5 V to +5.5 V without damage or functional disruption, enabling safe level translation from 5 V sources into ultra-low-voltage logic domains.

What is the purpose of the Schmitt-trigger inputs on 74LVC240AD,112?

Schmitt-trigger inputs provide hysteresis (≥0.3 V typical) to reject noise and accommodate slow-rising/falling waveforms. This eliminates false triggering on long traces, mechanical switch bounce, or marginal signal integrity-making the device ideal for industrial control, sensor interfaces, and legacy bus termination where edge rates are uncontrolled.

How does the IOFF feature protect the device during partial power-down?

When VCC = 0 V, the IOFF circuitry forces all outputs into high-impedance state and blocks current flow from powered inputs (e.g., 5 V signals) into the unpowered VCC rail. Measured IOFF leakage is ≤±10 μA at 5.5 V, preventing latch-up, thermal overstress, or corruption of other powered subsystems during hot-swap or staged power sequencing.

Is 74LVC240AD,112 pin-compatible with older 74LS240 or 74HC240 devices?

No. While functionally similar (octal inverting 3-state buffer), 74LVC240AD,112 uses a different pinout than 74LS240 (SO20) and 74HC240 (SO20). Specifically, output enables (1OE, 2OE) are on pins 1 and 19, whereas 74HC240 places both OEs on pin 1. Direct replacement requires PCB redesign or adapter routing.