74AC139SJ Equivalent & Substitute Parts

Part Overview

The 74AC139SJ is a Decoder/Demultiplexer logic IC manufactured by onsemi, featuring a 1 x 2:4 circuit configuration in a 16-SOP surface mount package. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The 74AC139 series decoder/demultiplexer is widely used in digital logic applications requiring address decoding and signal routing functions.

Substiute Parts

74AC139SJ

onsemiIn Stock: 89174AC139SJ Datasheet

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CD74AC139M

Harris CorporationIn Stock: 3704CD74AC139M Datasheet

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CD74AC139M96

Harris CorporationIn Stock: 2125CD74AC139M96 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74AC139SJ are identified based on the following critical parameters that determine functional equivalence:

• Circuit Configuration: 1 x 2:4 decoder/demultiplexer topology
• Independent Circuits: 2 circuits per package
• Output Current Capability: 24mA high and low output current
• Voltage Supply Source: Single supply operation
• Mounting Type: Surface mount technology
• Package Type: 16-pin SOIC variant
• Series Compatibility: 74AC logic family

The substitute parts CD74AC139M and CD74AC139M96, both manufactured by Harris Corporation, maintain identical circuit configurations, output current specifications, and mounting characteristics. Both are classified as obsolete components within the same 74AC series family.

Parameter Comparison

Engineering Selection Recommendations

Both CD74AC139M and CD74AC139M96 provide functional equivalence to the 74AC139SJ based on identical decoder/demultiplexer circuit topology, output current specifications, and 74AC series compatibility. The Harris Corporation substitutes operate across an extended voltage supply range (1.5V ~ 5.5V versus 2V ~ 6V) and extended operating temperature range (-55°C ~ 125°C versus -40°C ~ 85°C), providing broader environmental operating margins.

Package dimensions differ between the onsemi 74AC139SJ (0.209" width) and Harris substitutes (0.154" width), both in 16-SOIC configuration. This dimensional difference requires PCB layout verification for mechanical compatibility.

CD74AC139M is supplied in tube packaging, while CD74AC139M96 is supplied in bulk packaging. Both Harris parts are classified as RoHS non-compliant, consistent with their obsolete status and manufacturing era.

Frequently Asked Questions (FAQ)

Q: Are CD74AC139M and CD74AC139M96 functionally identical to 74AC139SJ?

A: Both Harris Corporation parts maintain identical decoder/demultiplexer circuit configuration (1 x 2:4), independent circuit count (2), and output current specifications (24mA high/low). All three parts operate as single-supply decoders within the 74AC logic family.

Q: What is the significance of the different voltage supply ranges?

A: The 74AC139SJ operates from 2V ~ 6V, while CD74AC139M and CD74AC139M96 operate from 1.5V ~ 5.5V. The Harris substitutes support lower minimum voltage operation but have a lower maximum voltage ceiling. System voltage requirements must be verified for compatibility.

Q: Do the package dimension differences affect substitution?

A: The 74AC139SJ uses a 16-SOIC package with 0.209" width, while the Harris substitutes use 16-SOIC with 0.154" width. Both are 16-pin SOIC packages with identical pin configurations, but the physical footprint differs. PCB layout and component placement must be evaluated for mechanical fit.

Q: What is the difference between CD74AC139M and CD74AC139M96?

A: Both parts are electrically and functionally identical. The primary difference is packaging: CD74AC139M is supplied in tube packaging, while CD74AC139M96 is supplied in bulk packaging. Selection depends on procurement and handling requirements.

Q: Are these parts suitable for new designs?

A: All three parts are classified as obsolete. Component selection for new designs should consider current-production alternatives within the 74AC or compatible logic families to ensure long-term supply availability and manufacturing support.