DM74S139N Equivalent & Substitute Parts

Part Overview

The DM74S139N is a Decoder/Demultiplexer logic IC with a 1 x 2:4 circuit configuration, manufactured by onsemi in a 16-PDIP package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing system support. The part operates on single supply voltage and is suitable for applications requiring decoding or demultiplexing functions in digital logic circuits.

Substiute Parts

DM74S139N

onsemiIn Stock: 1136DM74S139N Datasheet

Current PartRFQ

SN74S139AN

Texas InstrumentsIn Stock: 965SN74S139AN Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the DM74S139N is determined by the following critical parameters:

• Circuit Configuration: Must be 1 x 2:4 decoder/demultiplexer
• Independent Circuits: Must be 2
• Package Type: Must be 16-DIP (0.300", 7.62mm) for mechanical and electrical compatibility
• Voltage Supply Range: Must operate within 4.75V ~ 5.25V
• Operating Temperature Range: Must support 0°C ~ 70°C
• Mounting Type: Must be Through Hole
• Series Compatibility: 74S logic family

The SN74S139AN from Texas Instruments meets all these substitution criteria. While output current specifications differ (400µA/8mA versus 1mA/20mA), both parts operate within the same voltage and temperature ranges and share identical circuit configuration and package specifications, making them functionally interchangeable for standard decoder/demultiplexer applications.

Parameter Comparison

Engineering Selection Recommendations

The SN74S139AN is the primary substitute for the DM74S139N. Selection should be based on the following factors:

Product Status: The DM74S139N is obsolete, while the SN74S139AN is active. For new designs and long-term availability, the SN74S139AN is the recommended choice.

Compliance and Certifications: The SN74S139AN carries ROHS3 compliance, providing environmental and regulatory advantages over the obsolete onsemi part. Both parts maintain REACH Unaffected status and EAR99 classification.

Electrical Compatibility: Both parts operate within identical voltage supply ranges (4.75V ~ 5.25V) and temperature ranges (0°C ~ 70°C). The output current differences (400µA/8mA for SN74S139AN versus 1mA/20mA for DM74S139N) are within acceptable tolerances for standard TTL logic applications and do not affect functional substitution.

Package and Mounting: Both parts use identical 16-DIP through-hole packaging, ensuring direct pin-compatible replacement without PCB modifications.

Frequently Asked Questions (FAQ)

Q: Can the SN74S139AN directly replace the DM74S139N?

A: Yes. Both parts share identical circuit configuration (1 x 2:4), package type (16-DIP), voltage supply range (4.75V ~ 5.25V), and operating temperature range (0°C ~ 70°C). Pin compatibility is guaranteed, allowing direct substitution without circuit redesign.

Q: Why do the output current specifications differ between these parts?

A: Output current specifications reflect manufacturing differences between onsemi and Texas Instruments implementations of the 74S logic family. Both specifications are within acceptable TTL logic operating ranges and do not affect functional compatibility in standard decoder/demultiplexer applications.

Q: Is the SN74S139AN suitable for new designs?

A: Yes. The SN74S139AN is active product status with ROHS3 compliance, making it the appropriate choice for new designs requiring a 1 x 2:4 decoder/demultiplexer in 16-DIP through-hole packaging.

Q: What are the key parameters that determine substitution eligibility?

A: Circuit configuration (1 x 2:4), independent circuits count (2), package type (16-DIP), voltage supply range (4.75V ~ 5.25V), operating temperature range (0°C ~ 70°C), and mounting type (Through Hole) are the critical parameters for substitution compatibility.

Q: Are there any compliance differences between these parts?

A: The SN74S139AN includes ROHS3 compliance certification, while the obsolete DM74S139N does not carry this designation. Both maintain REACH Unaffected status and EAR99 classification.