MM74HC139N Equivalent & Substitute Parts

Part Overview

The MM74HC139N is a dual 2-line to 4-line decoder/demultiplexer logic IC manufactured by onsemi in 16-DIP packaging. This component functions as a decoder/demultiplexer with 1 x 2:4 circuit configuration and 2 independent circuits. The MM74HC139N is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

MM74HC139N

onsemiIn Stock: 2351MM74HC139N Datasheet

Current PartRFQ

CD74HC139E

Harris CorporationIn Stock: 2321CD74HC139E Datasheet

SimilarRFQ

SN74HC139AN

Texas InstrumentsIn Stock: 1244SN74HC139AN Datasheet

Parametric EquivalentRFQ

SN74HC139N

Texas InstrumentsIn Stock: 9861SN74HC139N Datasheet

Parametric EquivalentRFQ

SN74HC139NE4

Texas InstrumentsIn Stock: 903SN74HC139NE4 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MM74HC139N are qualified based on the following critical parameters:

• Functional Equivalence: Decoder/Demultiplexer type with 1 x 2:4 circuit configuration and 2 independent circuits
• Electrical Compatibility: Output current specifications of 5.2mA (high and low), single supply voltage source, and 2V ~ 6V supply range
• Package Compatibility: 16-DIP (0.300", 7.62mm) through-hole mounting
• Series Compatibility: 74HC logic family

All substitute parts listed maintain these core parameters, ensuring direct functional replacement in applications designed for the MM74HC139N.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Product Status)

The SN74HC139N, SN74HC139AN, and SN74HC139NE4 from Texas Instruments are active products with full parametric equivalence to the MM74HC139N. These parts maintain identical electrical specifications, package configuration, and operating temperature range. All three Texas Instruments variants are ROHS3 compliant, meeting modern environmental and regulatory requirements.

Secondary Substitute (Extended Temperature Range)

The CD74HC139E from Harris Corporation provides parametric equivalence with an extended operating temperature range of -55°C ~ 125°C compared to the MM74HC139N's -40°C ~ 85°C. However, this part is classified as obsolete and RoHS non-compliant. Selection of this part is appropriate only when extended temperature performance is required and regulatory compliance is not a constraint.

Recommended Selection Path

For new designs and ongoing procurement, select from the active Texas Instruments variants (SN74HC139N, SN74HC139AN, or SN74HC139NE4). These parts ensure long-term availability, regulatory compliance, and manufacturer support. The choice among these three variants depends on packaging preference and inventory availability, as all three are electrically and mechanically identical.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC139N directly replace the MM74HC139N in existing designs?

A: Yes. The SN74HC139N is a parametric equivalent with identical electrical specifications (output current, supply voltage range, operating temperature), circuit configuration (1 x 2:4 decoder/demultiplexer with 2 independent circuits), and 16-DIP package. Direct pin-for-pin substitution is supported.

Q: What is the difference between SN74HC139N, SN74HC139AN, and SN74HC139NE4?

A: All three parts are functionally and electrically identical. The differences are in packaging designation and inventory availability. SN74HC139N and SN74HC139AN are both supplied in tube packaging, while SN74HC139NE4 is also tube-packaged. Selection among these variants should be based on procurement availability and internal part numbering requirements.

Q: Is the CD74HC139E suitable as a replacement?

A: The CD74HC139E is parametrically equivalent but is obsolete and RoHS non-compliant. It is suitable only for applications where extended operating temperature range (-55°C ~ 125°C) is required and regulatory compliance is not mandated. For standard applications, active Texas Instruments variants are preferred.

Q: Are all substitute parts in the same 16-DIP package?

A: Yes. All substitute parts listed use the 16-DIP (0.300", 7.62mm) through-hole package, ensuring mechanical compatibility with existing PCB layouts designed for the MM74HC139N.

Q: What compliance certifications apply to the substitute parts?

A: The Texas Instruments variants (SN74HC139N, SN74HC139AN, SN74HC139NE4) are ROHS3 compliant and REACH unaffected. The CD74HC139E is RoHS non-compliant. For applications requiring environmental compliance, select from the Texas Instruments product line.