74ACT138SJX Equivalent & Substitute Parts

Part Overview

The 74ACT138SJX is a decoder/demultiplexer integrated circuit featuring a 1 x 3:8 configuration in a 16-SOP surface mount package. Manufactured by onsemi, this logic component is currently classified as obsolete. Due to its discontinued status, identifying functionally equivalent substitute parts is essential for design continuity, procurement flexibility, and long-term project viability.

Substiute Parts

74ACT138SJX

onsemiIn Stock: 204274ACT138SJX Datasheet

Current PartRFQ

74ACT138SCX

Fairchild SemiconductorIn Stock: 395274ACT138SCX Datasheet

SimilarRFQ

CD74ACT138M

Harris CorporationIn Stock: 33931CD74ACT138M Datasheet

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CD74ACT138M96

Texas InstrumentsIn Stock: 1805CD74ACT138M96 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACT138SJX are qualified based on the following criteria:

Functional Equivalence: All substitute parts share the identical base product number (74ACT138) and circuit configuration (1 x 3:8 decoder/demultiplexer).

Electrical Compatibility: Substitute parts maintain matching output current specifications (24mA high/low), voltage supply range (4.5V ~ 5.5V), and logic family classification (74ACT series).

Package Compatibility: Substitute parts utilize 16-SOIC or 16-SOP surface mount packages, ensuring mechanical and electrical pin compatibility with the original design.

Operating Conditions: Substitute parts operate within the specified temperature range or extended ranges, maintaining functional performance across the required thermal envelope.

Parameter Comparison

Engineering Selection Recommendations

For Active Product Status: The 74ACT138SCX (Fairchild Semiconductor) and CD74ACT138M96 (Texas Instruments) are both active products, providing long-term availability and supply chain stability. These parts are preferred for new designs and ongoing production requirements.

For Extended Temperature Range: The CD74ACT138M (Harris Corporation) and CD74ACT138M96 (Texas Instruments) support an extended operating temperature range of -55°C ~ 125°C, compared to the standard -40°C ~ 85°C range. Selection depends on thermal environment requirements.

For Regulatory Compliance: The CD74ACT138M96 (Texas Instruments) carries ROHS3 compliance certification, meeting modern environmental and regulatory standards. The CD74ACT138M (Harris Corporation) is RoHS non-compliant and should be evaluated against project compliance requirements.

For Package Considerations: The 74ACT138SJX uses a wider 16-SOIC package (0.209", 5.30mm width), while substitute parts 74ACT138SCX, CD74ACT138M, and CD74ACT138M96 use a narrower 16-SOIC package (0.154", 3.90mm width). PCB layout and footprint compatibility must be verified during design transition.

Frequently Asked Questions (FAQ)

Q: Are all listed substitute parts pin-compatible with the 74ACT138SJX?

A: All substitute parts share the same 16-pin SOIC/SOP configuration and identical pin assignments for the 1 x 3:8 decoder/demultiplexer function. However, physical package dimensions differ between the original part (0.209" width) and substitutes (0.154" width), requiring PCB footprint verification.

Q: What is the primary reason for substitution?

A: The 74ACT138SJX is classified as obsolete. Substitute parts with active product status (74ACT138SCX and CD74ACT138M96) ensure continued availability and supply chain reliability.

Q: Can I use a substitute part with an extended temperature range in place of the original?

A: Yes. Parts with extended temperature ranges (-55°C ~ 125°C) are functionally compatible with applications requiring the standard range (-40°C ~ 85°C). Extended range parts provide additional thermal margin without compromising electrical performance.

Q: What packaging formats are available for the substitute parts?

A: 74ACT138SCX is supplied in bulk format; CD74ACT138M is supplied in tubes; CD74ACT138M96 is supplied in tape and reel format. Selection depends on procurement volume and assembly process requirements.

Q: Are there RoHS compliance differences between substitute options?

A: Yes. CD74ACT138M96 (Texas Instruments) is ROHS3 compliant. CD74ACT138M (Harris Corporation) is RoHS non-compliant. The 74ACT138SCX compliance status is not specified in available data. Verify compliance requirements against project specifications.

Q: Which substitute part offers the best long-term availability?

A: CD74ACT138M96 (Texas Instruments) combines active product status with ROHS3 compliance and extended temperature range support, making it suitable for long-term production and new design implementations.