74ACT139PC Equivalent & Substitute Parts

Part Overview

The 74ACT139PC is a decoder/demultiplexer integrated circuit manufactured by onsemi, featuring a 1 x 2:4 logic configuration in a 16-pin DIP package. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and component procurement. The decoder/demultiplexer function requires direct substitution with parts maintaining identical electrical specifications and mechanical compatibility to ensure reliable circuit operation.

Substiute Parts

74ACT139PC

onsemiIn Stock: 210374ACT139PC Datasheet

Current PartRFQ

CD74ACT139E

Harris CorporationIn Stock: 31969CD74ACT139E Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACT139PC is determined by strict equivalence across the following critical parameters:

• Decoder Circuit Configuration: 1 x 2:4 topology with 2 independent circuits
• Output Drive Capability: 24mA high and low output current
• Supply Voltage Compatibility: 4.5V to 5.5V single supply operation
• Package Mechanical Compatibility: 16-pin DIP form factor with 0.300" (7.62mm) pitch
• Through-Hole Mounting: PCB integration method

The CD74ACT139E manufactured by Harris Corporation satisfies all substitution criteria, maintaining functional and mechanical equivalence with the 74ACT139PC across these defined parameters.

Parameter Comparison

Engineering Selection Recommendations

Both the 74ACT139PC and CD74ACT139E are classified as obsolete products. The CD74ACT139E provides functional substitution with identical electrical performance and mechanical compatibility. The CD74ACT139E operates across an extended temperature range (-55°C ~ 125°C) compared to the 74ACT139PC (-40°C ~ 85°C), offering broader environmental tolerance for applications requiring operation outside standard industrial temperature limits. The CD74ACT139E is RoHS non-compliant, consistent with the obsolete classification of both components. Selection between these parts should be based on application temperature requirements and component availability.

Frequently Asked Questions (FAQ)

Q: Can the CD74ACT139E directly replace the 74ACT139PC in existing circuits?

A: Yes. Both parts maintain identical decoder configuration (1 x 2:4), output current specifications (24mA), supply voltage range (4.5V ~ 5.5V), and 16-pin DIP package geometry. Direct pin-for-pin substitution is supported.

Q: What is the primary difference between these two parts?

A: The CD74ACT139E operates across an extended temperature range (-55°C ~ 125°C) versus the 74ACT139PC (-40°C ~ 85°C). Both parts are obsolete and RoHS non-compliant.

Q: Are there any package or mounting differences?

A: No. Both components use identical 16-pin DIP packaging with 0.300" (7.62mm) pitch and through-hole mounting configuration, ensuring mechanical compatibility on existing PCBs.

Q: What does the obsolete product status mean for procurement?

A: Obsolete status indicates these components are no longer in active production. Availability is limited to existing inventory from authorized distributors. Long-term sourcing should evaluate next-generation logic decoder alternatives.

Q: Are compliance certifications identical between these parts?

A: Both parts share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications. Both are RoHS non-compliant and carry MSL 1 (Unlimited) moisture sensitivity ratings.