74F139SC Equivalent & Substitute Parts

Part Overview

The 74F139SC is a Decoder/Demultiplexer integrated circuit manufactured by onsemi, featuring a 1 x 2:4 decoder configuration in a 16-SOIC surface mount package. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations. The 74F139SC operates as a single-supply logic device with specified output current capabilities and a standard operating temperature range suitable for industrial applications.

Substiute Parts

74F139SC

onsemiIn Stock: 243874F139SC Datasheet

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MC74AC139DR2G

onsemiIn Stock: 3782MC74AC139DR2G Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74F139SC is determined by strict equivalence in the following critical parameters:

• Functional Configuration: Decoder/Demultiplexer with 1 x 2:4 circuit topology and 2 independent circuits
• Package Compatibility: 16-SOIC surface mount package with identical physical dimensions (0.154", 3.90mm Width)
• Electrical Interface: Single supply voltage operation with compatible logic levels
• Output Characteristics: Current drive capability sufficient for the application
• Temperature Range: Operating temperature specifications meeting or exceeding the original specification

The MC74AC139DR2G qualifies as a direct substitute based on matching functional configuration, identical package type, and compatible electrical characteristics within the allowed parameter ranges for this product category.

Parameter Comparison

Engineering Selection Recommendations

The MC74AC139DR2G is the qualified substitute for the obsolete 74F139SC based on the following engineering criteria:

Functional Equivalence: Both devices implement identical 1 x 2:4 decoder/demultiplexer logic with 2 independent circuits in the same 16-SOIC package footprint, ensuring direct pin-for-pin compatibility.

Electrical Compatibility: The MC74AC139DR2G operates across a wider supply voltage range (2V ~ 6V) that encompasses the original 74F139SC specification (4.5V ~ 5.5V). Output current specifications of the substitute (24mA, 24mA) exceed the original device (1mA, 20mA), providing enhanced drive capability without functional degradation.

Environmental Specifications: The MC74AC139DR2G supports an extended operating temperature range (-40°C ~ 85°C) that fully covers the original specification (0°C ~ 70°C), enabling use in broader thermal environments.

Product Status and Compliance: The MC74AC139DR2G maintains active product status with ROHS3 compliance and identical moisture sensitivity classification (MSL 1), ensuring long-term availability and regulatory alignment.

Packaging and Supply: The substitute is available in Tape & Reel packaging with confirmed inventory, supporting both prototype and production-volume requirements.

Frequently Asked Questions (FAQ)

Q: Can the MC74AC139DR2G directly replace the 74F139SC without circuit modifications?

A: Yes. Both devices share identical functional configuration (1 x 2:4 decoder/demultiplexer), package type (16-SOIC), and pin assignments. The substitute operates across a wider voltage range and temperature range, making it functionally compatible in all applications where the original device was specified.

Q: What are the key differences between the 74F139SC and MC74AC139DR2G?

A: The primary differences are product status (obsolete vs. active), supply voltage range (4.5V ~ 5.5V vs. 2V ~ 6V), output current capability (1mA/20mA vs. 24mA/24mA), and operating temperature range (0°C ~ 70°C vs. -40°C ~ 85°C). The MC74AC139DR2G provides enhanced electrical performance and wider environmental specifications.

Q: Are there any package or mounting considerations when substituting these parts?

A: No. Both devices use identical 16-SOIC surface mount packages with matching physical dimensions (0.154", 3.90mm Width). PCB footprints and assembly processes remain unchanged.

Q: What is the moisture sensitivity level for both devices?

A: Both the 74F139SC and MC74AC139DR2G are classified as MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage or handling.

Q: Is the MC74AC139DR2G RoHS compliant?

A: Yes. The MC74AC139DR2G is ROHS3 compliant, meeting current environmental and regulatory requirements for electronic components.

Q: Can the MC74AC139DR2G be used in systems originally designed for the 74F139SC?

A: Yes. The substitute meets or exceeds all electrical and environmental specifications of the original device. The wider supply voltage range and extended temperature rating make it suitable for the same applications and additional operating conditions.