74ACT138

Product Overview

74ACT138 is commonly associated with 74ACT138 series high-speed CMOS 3-to-8 line decoders / demultiplexers, available from multiple manufacturers such as Texas Instruments, Nexperia, onsemi, STMicroelectronics and other logic IC suppliers. The device accepts three binary address inputs and provides eight mutually exclusive active-low outputs, with additional enable inputs for flexible decoding, cascading and demultiplexing applications. With 5V class ACT logic operation, TTL-compatible inputs, high-speed performance and common DIP, SOIC, TSSOP and related package options depending on the full ordering code, it is suitable for address decoding, memory selection, data routing, chip select generation, microprocessor systems, industrial control boards and legacy digital logic replacement projects.

Key Features

• Manufacturer: Multiple manufacturers / 74ACT logic family suppliers

• Marking / Short Part Number: 74ACT138

• Full / Related Part Number: SN74ACT138, 74ACT138, MC74ACT138, M74ACT138 and related variants

• Device Type: 3-to-8 line decoder / demultiplexer

• Product Category: Logic IC / decoder and demultiplexer

• Logic Family: 74ACT high-speed CMOS logic with TTL-compatible inputs

• Function: Decodes 3 binary inputs into 8 active-low outputs

• Number of Inputs: 3 address inputs plus enable inputs

• Number of Outputs: 8 decoded outputs

• Output Type: Active-low outputs

• Enable Inputs: Multiple enable inputs for cascading and flexible system decoding

• Supply Voltage: 5V class operation depending on manufacturer datasheet

• Input Compatibility: TTL-compatible inputs depending on exact ACT logic version

• Switching Feature: High-speed propagation delay for digital decoding applications

• Package Options: DIP, SOIC, TSSOP, SSOP and related package variants depending on full ordering code

• Mounting Type: Through-hole or surface mount depending on package version

• Key Features: 3-to-8 decoding, active-low outputs, enable control, TTL-compatible inputs, high-speed CMOS operation and easy cascading support

• Typical Use: Address decoding, memory chip selection, data routing, demultiplexing, microprocessor interfaces, control logic and digital system design

• Replacement Note: 74ACT138 is a common logic family part number used by multiple manufacturers; package, pinout, logic family, temperature grade and electrical characteristics should be checked before substitution

• Ordering / Packaging Note: Buyers should verify the full manufacturer part number, package suffix, temperature grade, top marking, packing format, logic family variant and datasheet revision before production or repair use.

Applications

74ACT138 can be used in electronic systems that require high-speed 3-to-8 line decoding or demultiplexing. Typical applications include microprocessor address decoding, memory selection, chip select generation, data routing, control signal distribution, digital logic boards, industrial control systems, communication equipment, consumer electronics, embedded controllers, maintenance projects and legacy system replacement. It is also suitable for BOM review where a 74ACT family 3-to-8 decoder / demultiplexer logic IC is required.

Quality & Sourcing

Antrex Electronics can support 74ACT138 sourcing with stock availability checks, RFQ quotation, package confirmation, date code review and shipment arrangement. For project-based purchasing, buyers can provide quantity, target price, required date code, packaging requirements and application information for faster quotation support.

For quality control, Antrex Electronics can help arrange product photos, label review, visual inspection and third-party testing support when required. OEMs, EMS providers, repair centers and electronic component buyers are welcome to send BOM lists or hard-to-find part requests for sourcing assistance.