74ACT138PC Equivalent & Substitute Parts

Part Overview

The 74ACT138PC is a decoder/demultiplexer integrated circuit manufactured by onsemi, designed for 1 x 3:8 logic decoding applications. This component features a 16-pin DIP package and operates on a single 5V supply. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

74ACT138PC

onsemiIn Stock: 143174ACT138PC Datasheet

Current PartRFQ

CD74ACT138E

Harris CorporationIn Stock: 2426CD74ACT138E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACT138PC is determined by the following critical parameters:

• Circuit Configuration: Must be 1 x 3:8 decoder/demultiplexer topology
• Output Current Capability: Minimum 24mA high and low output current
• Supply Voltage Compatibility: 4.5V ~ 5.5V single supply operation
• Package Format: 16-DIP through-hole mounting
• Logic Family: 74ACT series compatibility

The CD74ACT138E qualifies as a direct substitute based on matching all core electrical specifications and package requirements, despite differences in operating temperature range and manufacturer origin.

Parameter Comparison

Engineering Selection Recommendations

The CD74ACT138E serves as a functional equivalent to the 74ACT138PC for applications requiring 1 x 3:8 decoder/demultiplexer functionality. Both components share identical electrical specifications for output current, supply voltage, and logic family classification.

The CD74ACT138E provides an extended operating temperature range (-55°C ~ 125°C) compared to the 74ACT138PC (-40°C ~ 85°C), making it suitable for applications requiring broader thermal performance. However, the CD74ACT138E is classified as RoHS non-compliant, whereas the 74ACT138PC carries REACH Unaffected status. Component selection should account for applicable regulatory requirements and environmental compliance mandates for the target application.

Both components are classified as obsolete products. Procurement decisions should consider current inventory availability and long-term supply chain implications.

Frequently Asked Questions (FAQ)

Q: Can the CD74ACT138E directly replace the 74ACT138PC in existing designs?

A: Yes, the CD74ACT138E is electrically and mechanically compatible. Both components feature identical output current ratings (24mA), supply voltage range (4.5V ~ 5.5V), circuit configuration (1 x 3:8), and 16-DIP package format. Pin-to-pin compatibility is maintained.

Q: What is the primary difference between these two parts?

A: The CD74ACT138E operates across a wider temperature range (-55°C ~ 125°C) versus the 74ACT138PC (-40°C ~ 85°C). Additionally, the CD74ACT138E is RoHS non-compliant while the 74ACT138PC is REACH Unaffected. Regulatory compliance requirements should guide selection.

Q: Are there any packaging differences?

A: Both components use identical 16-DIP (0.300", 7.62mm) through-hole packages. No PCB layout modifications are required for substitution.

Q: Which part should be selected for new designs?

A: Selection should be based on temperature operating requirements and regulatory compliance mandates. The CD74ACT138E is preferable for extended temperature applications. For RoHS-compliant designs, verify alternative sources or newer logic family options.

Q: What is the significance of the 74ACT series designation?

A: The 74ACT designation indicates advanced CMOS technology with TTL-compatible logic levels. Both parts maintain this classification, ensuring consistent logic behavior and interface compatibility with TTL and CMOS systems.