74ACT138SJ Equivalent & Substitute Parts

Part Overview

The 74ACT138SJ is a decoder/demultiplexer logic integrated circuit manufactured by onsemi, featuring a 1 x 3:8 circuit configuration in a 16-SOP surface mount package. This component is classified as obsolete, which necessitates identification of equivalent substitute parts for ongoing design support and procurement continuity. The 74ACT138 series maintains consistent functional specifications across multiple manufacturers, enabling direct substitution based on electrical and mechanical compatibility parameters.

Substiute Parts

74ACT138SJ

onsemiIn Stock: 64274ACT138SJ Datasheet

Current PartRFQ

CD74ACT138M

Harris CorporationIn Stock: 33931CD74ACT138M Datasheet

SimilarRFQ

CD74ACT138M96

Texas InstrumentsIn Stock: 1805CD74ACT138M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACT138SJ is determined by the following critical parameters:

• Circuit configuration (1 x 3:8 decoder/demultiplexer function)
• Output current capability (24mA high and low)
• Supply voltage range (4.5V ~ 5.5V minimum compatibility)
• Mounting type (surface mount)
• Package type (16-SOIC or 16-SOP variants)

The identified substitute parts maintain identical functional specifications and electrical characteristics. Variations in operating temperature range, product status, and compliance certifications do not affect functional substitution but may influence selection based on application requirements and supply chain considerations.

Parameter Comparison

Engineering Selection Recommendations

CD74ACT138M96 (Texas Instruments) is the primary substitute for new designs and procurement. This part maintains active product status, ensuring long-term availability and supply chain stability. The CD74ACT138M96 is ROHS3 compliant and carries REACH unaffected certification, meeting modern environmental and regulatory requirements.

CD74ACT138M (Harris Corporation) provides an alternative substitute with identical electrical specifications. However, this part is classified as obsolete and non-compliant with RoHS standards, limiting its suitability for new applications or regulated environments.

Both substitute parts feature extended operating temperature ranges (-55°C ~ 125°C) compared to the original 74ACT138SJ (-40°C ~ 85°C), providing enhanced thermal performance for demanding applications.

Frequently Asked Questions (FAQ)

Q: Can CD74ACT138M96 directly replace 74ACT138SJ in existing designs?

A: Yes. Both parts maintain identical circuit configuration (1 x 3:8), output current specifications (24mA), and supply voltage range (4.5V ~ 5.5V). The extended operating temperature range of CD74ACT138M96 (-55°C ~ 125°C) is compatible with applications designed for the original part's -40°C ~ 85°C range.

Q: What is the difference between the package dimensions listed for these parts?

A: The 74ACT138SJ uses a 16-SOIC package with 0.209" width (5.30mm), while CD74ACT138M and CD74ACT138M96 use 16-SOIC packages with 0.154" width (3.90mm). Both are surface mount SOIC packages; the dimensional difference reflects manufacturing variations between suppliers. PCB layout compatibility should be verified for the specific package variant.

Q: Why is CD74ACT138M96 recommended over CD74ACT138M?

A: CD74ACT138M96 maintains active product status, ensuring continued availability and manufacturing support. It is ROHS3 compliant and carries REACH unaffected certification, meeting current environmental regulations. CD74ACT138M is obsolete and RoHS non-compliant, presenting supply chain and regulatory risks.

Q: Are there any functional differences between these substitute parts?

A: No. All three parts (74ACT138SJ, CD74ACT138M, CD74ACT138M96) perform identical decoder/demultiplexer functions with matching electrical specifications. Differences in operating temperature range, product status, and compliance certifications do not affect functional operation within the specified supply voltage and output current parameters.

Q: What packaging options are available for these substitutes?

A: The 74ACT138SJ is supplied in standard packaging. CD74ACT138M is available in Tube packaging. CD74ACT138M96 is supplied in Tape & Reel (TR) format, which is standard for high-volume production environments.