Texas Instruments 74AC11240DWRE4

Overview

74AC11240DWRE4 from Texas Instruments is an octal inverting buffer/line driver with dual 4-bit sections, active-low 3-state output-enable inputs, and flow-through pinout architecture. It operates from –40°C to 85°C at VCC = 3–5.5 V, delivers ±24 mA output drive, and features 5.4 ns typical tPHL (VCC = 5 V), enabling high-speed bus interfacing in memory address and clock distribution systems.

For engineers reviewing the 74AC11240DWRE4 datasheet, 74AC11240DWRE4 pinout, 74AC11240DWRE4 application, or 74AC11240DWRE4 equivalent, key selection criteria include symmetrical OE control per section, inverting logic behavior, 3-state noise suppression capability, and DW package thermal performance (1.7 W at TA = 55°C).

Technical Context

This device implements two independent 4-bit inverting buffers, each with dedicated active-low output-enable (OE) inputs-1OE controls Y1–Y4, 2OE controls Y1–Y4 of second section. Outputs enter high-impedance state when respective OE is high, supporting bidirectional bus contention management.

Designed on TI's EPIC 1-µm CMOS process, it achieves latch-up immunity of 500 mA at 125°C and supports fast switching with input transition rates up to 5 ns/V (OE) and 10 ns/V (data), while center-pin VCC/GND placement minimizes simultaneous switching noise in dense PCB layouts.

Key Specifications

Pinout & Package

DW package: 24-pin plastic small-outline (SOIC) with 300-mil width, gull-wing leads, and center-aligned VCC (pin 14) and GND (pins 7, 8, 9, 10) for low-inductance power delivery.

Key Features

Applications

Equivalent & Alternatives

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

Compared with SN74AC240N and 74LVC240APW, the 74AC11240DWRE4 uniquely combines 5 V operation, flow-through SOIC layout, and center VCC/GND-making it optimal for noise-critical, space-constrained 5 V bus systems where layout efficiency and signal integrity outweigh package form-factor flexibility.

Availability

74AC11240DWRE4 is available at Aetrix Electronics and suitable for memory subsystem design, microprocessor bus expansion, and clock distribution networks requiring stable component supply, long-term industrial lifecycle support, and consistent parametric performance across temperature.

Supply support for 74AC11240DWRE4 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 logic solutions, with decades of innovation in high-reliability industrial and automotive-grade components.

The 74AC logic family was engineered for high-speed, low-noise 5 V digital systems-specifically targeting memory addressing, bus driving, and clock distribution where timing precision and noise immunity are critical.

FAQ

What is the operating temperature range for the 74AC11240DWRE4?

The 74AC11240DWRE4 is characterized for operation from –40°C to +85°C ambient temperature. This industrial-grade range ensures reliable functionality in embedded control panels, factory automation equipment, and outdoor communication infrastructure where thermal extremes occur. All electrical specifications-including propagation delay, output drive, and noise margins-are guaranteed across this full range.

Does the 74AC11240DWRE4 support 3.3 V input logic levels?

Yes, the 74AC11240DWRE4 accepts 3.3 V logic inputs reliably when operated at VCC = 5 V. Its VIH threshold is 3.15 V (min) at VCC = 4.5 V, providing 0.15 V margin above 3.3 V logic high, and its input structure is robust against partial-voltage signaling. This makes the 74AC11240DWRE4 suitable for interfacing 3.3 V microcontrollers with 5 V peripheral buses.

How does the flow-through architecture of the 74AC11240DWRE4 improve PCB layout?

The flow-through pinout of the 74AC11240DWRE4 places inputs on one side (pins 1–4, 13, 17–20) and corresponding outputs on the opposite side (pins 11–12, 15–16, 21–24), enabling straight-line trace routing without vias or layer jumps. This reduces parasitic inductance, minimizes crosstalk, and simplifies high-density board design-especially in memory and bus applications where signal integrity is critical.

What is the maximum continuous output current rating for the 74AC11240DWRE4?

The 74AC11240DWRE4 supports ±24 mA per output at VCC = 4.5–5.5 V under steady-state conditions, with absolute maximum ratings of ±50 mA for short-duration pulses. This drive strength allows direct interfacing with standard TTL loads, 50-pF transmission lines, and multiple CMOS inputs without external buffers-reducing BOM count and board area in bus driver implementations.

Is the 74AC11240DWRE4 pin-compatible with other 24-pin octal buffers in the AC family?

No-the 74AC11240DWRE4 has a unique 24-pin DW package pinout optimized for flow-through routing and center VCC/GND, differing from standard 24-pin AC buffers like the 74AC541 or 74AC244. Its pin mapping is specific to dual 4-bit inverting sections with separate OE inputs; substitution requires schematic and layout verification. Always consult the 74AC11240DWRE4 pin diagram before replacement.