74ACT139SC Equivalent & Substitute Parts

Part Overview

The 74ACT139SC is a Decoder/Demultiplexer logic IC with 1 x 2:4 circuit configuration in a 16-SOIC surface mount package. Manufactured by onsemi, this component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates on single supply voltage and delivers 24mA output current capability in both high and low states.

Substiute Parts

74ACT139SC

onsemiIn Stock: 212474ACT139SC Datasheet

Current PartRFQ

MC74ACT139DR2G

onsemiIn Stock: 2269MC74ACT139DR2G Datasheet

DirectRFQ

MC74ACT139DG

onsemiIn Stock: 2067MC74ACT139DG Datasheet

Parametric EquivalentRFQ

CD74ACT139M

Harris CorporationIn Stock: 7082CD74ACT139M Datasheet

DirectRFQ

CD74ACT139M96

Texas InstrumentsIn Stock: 31774CD74ACT139M96 Datasheet

SimilarRFQ

74ACT11139D

Texas InstrumentsIn Stock: 134474ACT11139D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACT139SC is determined by the following critical parameters:

• Circuit Configuration: 1 x 2:4 decoder/demultiplexer function
• Independent Circuits: 2 circuits per package
• Package Type: 16-SOIC surface mount form factor
• Voltage Supply Range: 4.5V ~ 5.5V single supply operation
• Output Current Capability: 24mA high and low output current
• Mounting Type: Surface mount compatibility

Substitute parts are grouped into three categories:

Direct Manufacturer Substitutes (onsemi): Parts with identical electrical specifications and active product status, differing only in packaging format (Cut Tape vs. Tube).

Parametric Equivalents: Parts from alternative manufacturers (Harris Corporation, Texas Instruments) that maintain identical functional specifications and package dimensions, with variations in product status and temperature operating range.

Similar Equivalents: Parts with matching circuit function and package but extended temperature operating range (-55°C ~ 125°C vs. -40°C ~ 85°C).

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended)

MC74ACT139DR2G and MC74ACT139DG from onsemi are direct functional equivalents with active product status. Both maintain identical electrical specifications, voltage supply range, output current capability, and operating temperature range as the 74ACT139SC. Both are ROHS3 compliant. Selection between these two depends on packaging preference: MC74ACT139DR2G is supplied in Cut Tape format, while MC74ACT139DG is supplied in Tube format.

Secondary Substitutes (Extended Temperature Range)

CD74ACT139M96 from Texas Instruments provides an active product alternative with extended operating temperature range (-55°C ~ 125°C). This part is ROHS3 compliant and maintains all other electrical specifications. Use this part when extended temperature operation is required. CD74ACT139M from Harris Corporation offers identical extended temperature capability but is obsolete and RoHS non-compliant, making it unsuitable for new designs.

Tertiary Substitute (Matched Temperature Range)

74ACT11139D from Texas Instruments is an active product with matching operating temperature range (-40°C ~ 85°C) and ROHS3 compliance. This part provides functional equivalence with the same thermal specifications as the original 74ACT139SC.

Frequently Asked Questions (FAQ)

Q: Can MC74ACT139DR2G directly replace 74ACT139SC in existing designs?

A: Yes. MC74ACT139DR2G is a direct functional equivalent with identical voltage supply range (4.5V ~ 5.5V), output current capability (24mA high/low), operating temperature range (-40°C ~ 85°C), and 16-SOIC package configuration. The primary difference is packaging format (Cut Tape vs. original format) and active product status.

Q: What is the difference between MC74ACT139DR2G and MC74ACT139DG?

A: Both parts are functionally identical onsemi products with active status. The difference is packaging: MC74ACT139DR2G is supplied in Cut Tape (CT) format, while MC74ACT139DG is supplied in Tube format. Selection depends on procurement and assembly requirements.

Q: When should CD74ACT139M96 be selected over MC74ACT139DR2G?

A: CD74ACT139M96 should be selected when the application requires extended operating temperature range (-55°C ~ 125°C). Both parts are ROHS3 compliant and maintain identical voltage and output current specifications. MC74ACT139DR2G is limited to -40°C ~ 85°C operation.

Q: Is CD74ACT139M suitable for new designs?

A: No. CD74ACT139M is obsolete and RoHS non-compliant. While it offers extended temperature range (-55°C ~ 125°C), active alternatives with equivalent specifications are available.

Q: Are all substitute parts pin-compatible with 74ACT139SC?

A: Yes. All listed substitute parts use the 16-SOIC package with identical pin configuration and function. Direct PCB substitution is possible without layout modification.

Q: What compliance certifications apply to substitute parts?

A: MC74ACT139DR2G, MC74ACT139DG, CD74ACT139M96, and 74ACT11139D are all ROHS3 compliant. CD74ACT139M is RoHS non-compliant and should not be used in applications requiring RoHS compliance.