DM74LS139N Equivalent & Substitute Parts

Part Overview

The DM74LS139N is a dual 2-line to 4-line decoder/demultiplexer logic integrated circuit manufactured by onsemi in 16-DIP packaging. This component functions as a decoder with 1 x 2:4 circuit configuration and 2 independent circuits, designed for digital signal routing and selection applications in TTL logic systems.

The DM74LS139N is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production or repair requirements for systems utilizing this decoder/demultiplexer.

Substiute Parts

DM74LS139N

onsemiIn Stock: 1944DM74LS139N Datasheet

Current PartRFQ

SN74LS139AN

Texas InstrumentsIn Stock: 2375SN74LS139AN Datasheet

Parametric EquivalentRFQ

SN74LS139ANE4

Texas InstrumentsIn Stock: 987SN74LS139ANE4 Datasheet

Parametric EquivalentRFQ

SN74LS155AN

Texas InstrumentsIn Stock: 1997SN74LS155AN Datasheet

Parametric EquivalentRFQ

SN74S139AN

Texas InstrumentsIn Stock: 965SN74S139AN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74LS139N is determined by strict equivalence across the following parameters:

• Circuit Type & Configuration: Decoder/Demultiplexer with 1 x 2:4 circuit and 2 independent circuits
• Electrical Characteristics: Output current specifications (400µA high, 8mA low), single supply voltage operation (4.75V ~ 5.25V)
• Operating Temperature Range: 0°C ~ 70°C
• Physical Package: 16-DIP (0.300", 7.62mm) through-hole mounting
• Logic Series Compatibility: 74LS and 74S series logic families

All substitute parts listed maintain identical functional specifications and package dimensions, ensuring direct replacement capability in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (74LS Series)

SN74LS139AN and SN74LS139ANE4 are direct parametric equivalents manufactured by Texas Instruments. Both parts maintain identical electrical and mechanical specifications to the DM74LS139N. These components are in active production status and comply with ROHS3 requirements, making them suitable for new designs and legacy system replacements where RoHS compliance is required.

Alternative Substitute (74LS Series - Different Base Number)

SN74LS155AN is functionally equivalent with identical circuit configuration, electrical characteristics, and package specifications. This part operates under a different base product number (74LS155 versus 74LS139) but maintains full compatibility with the DM74LS139N in decoder/demultiplexer applications. Active production status and ROHS3 compliance are confirmed.

Higher-Speed Alternative (74S Series)

SN74S139AN represents a faster logic family variant (74S versus 74LS) while maintaining identical functional specifications and package form factor. The 74S series provides improved switching speed characteristics compared to 74LS logic. This part is actively produced and ROHS3 compliant, suitable for applications requiring enhanced speed performance within the same package envelope.

Frequently Asked Questions (FAQ)

Q: Can SN74LS139AN directly replace DM74LS139N in existing circuit boards?

A: Yes. SN74LS139AN is a parametric equivalent with identical circuit configuration (1 x 2:4 decoder/demultiplexer), electrical specifications (400µA/8mA output current, 4.75V–5.25V supply), operating temperature range (0°C–70°C), and 16-DIP package dimensions. Direct pin-for-pin substitution is supported.

Q: What is the difference between SN74LS139AN and SN74LS155AN?

A: Both parts are functionally equivalent decoders with identical electrical and mechanical specifications. The primary difference is the base product number designation (74LS139 versus 74LS155). Both maintain the same 1 x 2:4 circuit configuration, output current ratings, supply voltage range, and 16-DIP packaging. Selection between these parts depends on design documentation requirements or supplier availability.

Q: Why is SN74S139AN listed as an alternative if it uses a different logic series?

A: SN74S139AN maintains identical functional specifications and package form factor to the DM74LS139N. The 74S logic family operates at faster switching speeds than 74LS logic while preserving the same voltage supply range (4.75V–5.25V), output current characteristics (400µA/8mA), and operating temperature range (0°C–70°C). This part is suitable for applications where improved speed performance is beneficial within the same physical package.

Q: Are all substitute parts RoHS compliant?

A: All Texas Instruments substitute parts (SN74LS139AN, SN74LS139ANE4, SN74LS155AN, SN74S139AN) are ROHS3 compliant. The original DM74LS139N is RoHS non-compliant. For applications requiring RoHS compliance, any of the listed Texas Instruments substitutes are appropriate selections.

Q: What is the difference between SN74LS139AN and SN74LS139ANE4 packaging?

A: Both parts are electrically and functionally identical. SN74LS139AN is supplied in tube packaging, while SN74LS139ANE4 is also supplied in tube packaging. Both maintain the 16-PDIP package specification. Selection between these variants depends on supplier availability and quantity requirements.

Q: Can these parts be used in new product designs?

A: Yes. All Texas Instruments substitute parts are in active production status. SN74LS139AN, SN74LS139ANE4, SN74LS155AN, and SN74S139AN are suitable for new designs. ROHS3 compliance of these parts supports integration into products subject to environmental and regulatory requirements.