Nexperia USA Inc. 74LVC244AD,118

Overview

74LVC244AD,118 from Nexperia is an octal 3-state buffer/line driver in SO20 (SOT163-1) package, designed for bidirectional bus interfacing and level translation between 1.2 V–3.6 V logic domains. It features dual independent output enables (1OE, 2OE), Schmitt-trigger inputs for noise immunity, IOFF partial power-down protection, and overvoltage-tolerant inputs up to 5.5 V-enabling reliable operation in mixed-voltage systems such as industrial I/O expansion and FPGA peripheral buffering.

For engineers reviewing the 74LVC244AD,118 datasheet, 74LVC244AD,118 pinout, 74LVC244AD,118 application, or 74LVC244AD,118 equivalent, key selection criteria include its 1.2 V–3.6 V supply range, 24 mA drive strength at 3.0 V, 5.9 ns max propagation delay, -40 °C to +125 °C temperature rating, and compatibility with TTL-level inputs in 3.3 V systems.

Technical Context

This device implements two independent 4-bit non-inverting buffers, each controlled by a dedicated active-low output enable (1OE for Y0–Y3, 2OE for Y0'–Y3'). Its CMOS architecture ensures low static current (≤40 μA at 3.6 V), while IOFF circuitry disables outputs during power-down to prevent backflow current. The Schmitt-trigger inputs provide hysteresis (typically 0.3 V at VCC = 3.3 V), enabling robust operation with slow-rising signals from microcontrollers or legacy peripherals.

It complies with JEDEC standards JESD8-7A (1.65–1.95 V), JESD8-5A (2.3–2.7 V), and JESD8-C/JESD36 (2.7–3.6 V), and supports dynamic loading up to 30 pF with ≤2.5 ns input rise/fall times across its full voltage range. Bus hold is absent in the 74LVC244A variant (present only in 74LVCH244A), confirming this part relies on external termination or system-level pull resistors.

Key Specifications

Pinout & Package

74LVC244AD,118 uses the SO20 plastic small outline package (SOT163-1), 20-pin, 7.5 mm body width, with standard 1.27 mm pitch and gull-wing leads. Pin 1 is marked by a notch or dot; the package is RoHS-compliant and halogen-free.

Key Features

Applications

Equivalent & Alternatives

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

Compared with 74LVC244APW,118, the SO20 package offers easier manual soldering and higher creepage clearance; compared with SN74LVC244APWR, the Nexperia part guarantees IOFF activation at VCC = 0 V, making it safer for uncontrolled power-down scenarios.

Availability

74LVC244AD,118 is available at Aetrix Electronics and suitable for industrial I/O expansion, FPGA peripheral interfacing, and automotive body control modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 74LVC244AD,118 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 focused on essential efficiency technologies, delivering high-performance logic, analog, and MOSFET solutions optimized for reliability and energy efficiency in industrial, automotive, and computing applications.

The 74LVC series targets low-voltage, high-speed digital interfacing where power efficiency, noise immunity, and mixed-voltage compatibility are critical - especially in space- and thermal-constrained embedded systems.

FAQ

Can 74LVC244AD,118 interface directly with 5 V TTL outputs?

Yes - its inputs tolerate up to 5.5 V regardless of VCC, allowing direct connection to 5 V TTL outputs without external level shifters. However, output voltage swing is limited to VCC (max 3.6 V), so driving 5 V TTL inputs requires external pull-up resistors or a dedicated level translator.

What is the minimum VCC required for guaranteed 3.3 V logic compatibility?

The device is fully specified down to 1.2 V, but for reliable 3.3 V system interoperability, VCC must be ≥2.7 V per JEDEC JESD8-C compliance. At VCC = 2.7 V, VOH ≥2.2 V and VOL ≤0.55 V under 24 mA load - meeting 3.3 V LVTTL thresholds with margin.

Does 74LVC244AD,118 include bus hold circuitry?

No - bus hold is exclusive to the 74LVCH244A variant. The 74LVC244A lacks internal data-input bus hold, meaning unused inputs must be externally terminated to VCC or GND to prevent floating states and potential shoot-through current.

How does IOFF protection behave during partial power-down?

When VCC drops below ~0.8 V, the IOFF circuit forces all outputs into high-impedance state regardless of OE pin state, blocking reverse current flow from powered downstream circuits into the unpowered IC - critical for hot-swap and battery-backup applications.