74AC139MTC Decoder/Demultiplexer Equivalent & Substitute Parts

Part Overview

The 74AC139MTC is a logic decoder/demultiplexer IC featuring a 1 x 2:4 circuit configuration in a 16-TSSOP surface mount package. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. Substitute parts must maintain identical electrical performance, pin configuration, and mechanical compatibility to ensure direct replacement capability.

Substiute Parts

74AC139MTC

onsemiIn Stock: 94774AC139MTC Datasheet

Current PartRFQ

74AC139MTCX

onsemiIn Stock: 445674AC139MTCX Datasheet

DirectRFQ

MC74AC139DTR2G

onsemiIn Stock: 1241MC74AC139DTR2G Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74AC139MTC are qualified based on the following critical parameters that determine functional and mechanical compatibility:

• Circuit Configuration: 1 x 2:4 decoder/demultiplexer topology
• Independent Circuits: 2 circuits per package
• Output Current Ratings: 24mA high, 24mA low
• Voltage Supply Range: 2V ~ 6V single supply operation
• Operating Temperature Range: -40°C ~ 85°C
• Package Type: 16-TSSOP surface mount
• Pin Configuration: Identical 16-pin TSSOP footprint

All substitute parts listed maintain these electrical and mechanical parameters, enabling direct replacement without circuit redesign or PCB modification.

Parameter Comparison

Engineering Selection Recommendations

74AC139MTCX is the primary substitute for 74AC139MTC. Both parts share identical electrical specifications and 16-TSSOP packaging. The 74AC139MTCX maintains active product status and carries ROHS3 compliance certification, making it suitable for new designs and production environments requiring regulatory adherence. Packaging format is Tape & Reel (TR), standard for automated assembly operations.

MC74AC139DTR2G provides an alternative substitute with equivalent electrical and mechanical characteristics. This part also maintains active product status and ROHS3 compliance. The MC74AC139DTR2G designation reflects onsemi's alternative part numbering scheme while preserving full functional compatibility with the original 74AC139MTC.

Both substitute parts are manufactured by onsemi, the original equipment manufacturer, ensuring consistency in design, quality, and performance characteristics. Selection between 74AC139MTCX and MC74AC139DTR2G should be based on supply chain availability, packaging preferences, and inventory management requirements.

Frequently Asked Questions (FAQ)

Q: Can 74AC139MTCX directly replace 74AC139MTC without PCB modification?

A: Yes. The 74AC139MTCX maintains identical pin configuration, electrical specifications, and 16-TSSOP package dimensions. Direct substitution on existing PCBs is supported without circuit redesign.

Q: What is the difference between 74AC139MTCX and MC74AC139DTR2G?

A: Both parts are functionally equivalent with identical electrical performance and 16-TSSOP packaging. The difference lies in onsemi's part numbering convention. Selection depends on supply availability and packaging format preference (both are Tape & Reel).

Q: Why is the original 74AC139MTC marked as obsolete?

A: Product obsolescence reflects onsemi's lifecycle management. Active substitutes 74AC139MTCX and MC74AC139DTR2G provide continued support for this decoder/demultiplexer function.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both 74AC139MTCX and MC74AC139DTR2G carry ROHS3 compliance certification, meeting environmental and regulatory requirements for modern manufacturing.

Q: What packaging format is used for production quantities?

A: Both substitute parts are supplied in Tape & Reel (TR) format, standard for automated pick-and-place assembly operations.

Q: Do the substitute parts operate across the same temperature range?

A: Yes. All parts, including the original 74AC139MTC and substitutes 74AC139MTCX and MC74AC139DTR2G, operate across -40°C to 85°C.