74AC138SJ Equivalent & Substitute Parts

Part Overview

The 74AC138SJ is a decoder/demultiplexer integrated circuit manufactured by onsemi, featuring a 1 x 3:8 configuration in a 16-SOP surface mount package. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement.

Substiute Parts

74AC138SJ

onsemiIn Stock: 74574AC138SJ Datasheet

Current PartRFQ

CD74AC138M96

Texas InstrumentsIn Stock: 4147CD74AC138M96 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74AC138SJ is based on the following critical parameters that must remain consistent:

• Functional Logic: 1 x 3:8 decoder/demultiplexer configuration
• Output Drive Capability: 24mA high and low output current
• Supply Voltage Compatibility: Operating range must encompass or exceed the original 2V ~ 6V specification
• Package Type: Surface mount SOIC configuration with compatible pin count (16 pins)
• Series Compatibility: 74AC logic family maintains functional equivalence

The CD74AC138M96 from Texas Instruments satisfies all substitution criteria within these parameters.

Parameter Comparison

Engineering Selection Recommendations

The CD74AC138M96 is the qualified substitute for the 74AC138SJ based on the following factors:

Functional Equivalence: Both components implement identical 1 x 3:8 decoder/demultiplexer logic with matching output drive specifications (24mA).

Supply Voltage: The CD74AC138M96 operates across 1.5V ~ 5.5V, which encompasses the original 2V ~ 6V range within the critical 2V ~ 5.5V overlap region. Applications operating within 2V ~ 5.5V are fully compatible.

Temperature Range: The CD74AC138M96 extends the operating temperature range to -55°C ~ 125°C, providing broader environmental coverage than the original -40°C ~ 85°C specification.

Product Status: The CD74AC138M96 is active production, ensuring long-term availability and supply chain continuity compared to the obsolete 74AC138SJ.

Compliance: Both components maintain identical Moisture Sensitivity Level (MSL 1), REACH status, and ECCN classification, ensuring regulatory consistency.

Package Consideration: While both use 16-SOIC packages, the CD74AC138M96 features a narrower body width (3.90mm vs. 5.30mm). PCB layout verification is required to confirm physical compatibility with existing footprints.

Frequently Asked Questions (FAQ)

Q: Can the CD74AC138M96 directly replace the 74AC138SJ in existing designs?

A: Functional and electrical compatibility is confirmed for applications operating within the 2V ~ 5.5V supply voltage range. Physical package dimensions differ (3.90mm vs. 5.30mm body width), requiring PCB footprint verification before implementation.

Q: What is the significance of the product status difference?

A: The 74AC138SJ is obsolete, indicating discontinued manufacturing and limited availability. The CD74AC138M96 is in active production, ensuring reliable procurement and supply chain support for new designs and production runs.

Q: Are there any supply voltage limitations for substitution?

A: The CD74AC138M96 operates at 1.5V ~ 5.5V, while the original 74AC138SJ operates at 2V ~ 6V. Substitution is valid for applications within the 2V ~ 5.5V overlap range. Applications requiring operation above 5.5V require alternative solutions.

Q: How do the output current specifications compare?

A: Both components provide identical output drive capability at 24mA high and 24mA low, ensuring equivalent load-driving performance in decoder/demultiplexer applications.

Q: What package considerations apply to this substitution?

A: Both components use 16-SOIC surface mount packages. The CD74AC138M96 has a narrower body width (3.90mm) compared to the 74AC138SJ (5.30mm). Verify PCB footprint compatibility and clearance requirements before design implementation.

Q: Are moisture sensitivity and compliance ratings equivalent?

A: Yes. Both components maintain MSL 1 (Unlimited), identical REACH status, and matching ECCN classification, confirming regulatory and environmental compliance equivalence.