CD74ACT139ME4 Equivalent & Substitute Parts

Part Overview

The CD74ACT139ME4 is a decoder/demultiplexer logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This device implements a 1 x 2:4 decoder/demultiplexer function with dual independent circuits, operating from a single 4.5V to 5.5V supply. The part is designated as Last Time Buy status, indicating limited future availability. Identifying equivalent and substitute parts is necessary to ensure design continuity and supply chain reliability for applications requiring this decoder/demultiplexer functionality.

Substiute Parts

CD74ACT139ME4

Texas InstrumentsIn Stock: 1172CD74ACT139ME4 Datasheet

Current PartRFQ

CD74ACT139M

Harris CorporationIn Stock: 7082CD74ACT139M Datasheet

MFR RecommendedRFQ

CD74ACT139M96

Texas InstrumentsIn Stock: 31774CD74ACT139M96 Datasheet

MFR RecommendedRFQ

74ACT139SCX

Fairchild SemiconductorIn Stock: 1858074ACT139SCX Datasheet

MFR RecommendedRFQ

MC74ACT139DG

onsemiIn Stock: 2067MC74ACT139DG Datasheet

MFR RecommendedRFQ

MC74ACT139DR2G

onsemiIn Stock: 2269MC74ACT139DR2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74ACT139ME4 is determined by strict equivalence in the following parameters:

• Circuit configuration: 1 x 2:4 decoder/demultiplexer with 2 independent circuits
• Output current capability: 24mA high and low
• Supply voltage: 4.5V ~ 5.5V single supply
• Package: 16-SOIC surface mount form factor
• Series compatibility: 74ACT logic family

All identified substitute parts maintain these core electrical and mechanical specifications. Variations in product status, compliance certifications, and operating temperature ranges are noted but do not affect functional interchangeability within the specified parameter envelope.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: CD74ACT139M96

The CD74ACT139M96 from Texas Instruments is the preferred substitute. It maintains identical electrical specifications to the CD74ACT139ME4, operates across the full temperature range (-55°C to 125°C), carries Active product status ensuring continued availability, and meets ROHS3 compliance requirements. The primary difference is packaging format: CD74ACT139M96 is supplied in Cut Tape (CT) & Digi-Reel format rather than Tube.

Secondary Recommendations: MC74ACT139DG and MC74ACT139DR2G

Both onsemi parts (MC74ACT139DG and MC74ACT139DR2G) provide functional equivalence with Active product status and ROHS3 compliance. These parts operate within a narrower temperature range (-40°C to 85°C), which is acceptable for applications not requiring the extended low-temperature performance of the original part. MC74ACT139DG is supplied in Tube packaging; MC74ACT139DR2G is supplied in Cut Tape format.

Alternative: 74ACT139SCX

The Fairchild Semiconductor 74ACT139SCX maintains electrical equivalence and Active status but is supplied in Bulk packaging and operates within the -40°C to 85°C temperature range. RoHS compliance status is not specified for this part.

Not Recommended: CD74ACT139M

The CD74ACT139M from Harris Corporation, while electrically equivalent, carries Obsolete product status and is RoHS non-compliant, making it unsuitable for new designs or long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can I use CD74ACT139M96 as a direct replacement for CD74ACT139ME4?

A: Yes. Both parts are electrically identical with matching circuit configuration, output current, supply voltage, and operating temperature range. The difference is packaging format: CD74ACT139M96 uses Cut Tape & Digi-Reel packaging instead of Tube. Verify your assembly process accommodates the packaging format before implementation.

Q: What is the impact of using MC74ACT139DG instead of CD74ACT139ME4?

A: The MC74ACT139DG is functionally equivalent for all electrical parameters. The operating temperature range is narrower (-40°C to 85°C versus -55°C to 125°C). Use this part only if your application operates within the -40°C to 85°C range. Product status is Active, ensuring supply availability.

Q: Why is CD74ACT139M not recommended despite electrical equivalence?

A: The CD74ACT139M carries Obsolete product status and does not meet ROHS3 compliance. These factors indicate limited future availability and potential regulatory restrictions in certain markets. Active, compliant alternatives are available.

Q: Does packaging format affect electrical performance?

A: No. Tube, Cut Tape, and Bulk packaging formats contain identical die and electrical characteristics. Packaging selection is determined by assembly equipment compatibility and supply chain requirements, not electrical function.

Q: Are all substitute parts pin-compatible with the CD74ACT139ME4?

A: Yes. All listed substitutes use the 16-SOIC package with identical pinout and functional assignment. PCB layout and footprint remain unchanged.

Q: Which substitute has the best long-term availability?

A: CD74ACT139M96 from Texas Instruments carries Active product status and is the original manufacturer of the CD74ACT139ME4, providing the strongest supply continuity. onsemi parts (MC74ACT139DG and MC74ACT139DR2G) also carry Active status.