SN74154N Equivalent & Substitute Parts

Part Overview

The SN74154N is a Decoder/Demultiplexer IC with 1 x 4:16 circuit configuration, manufactured by Texas Instruments in the 7400 series. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The SN74154N operates as a single-supply logic decoder suitable for applications requiring address decoding and demultiplexing functions in legacy systems.

Substiute Parts

SN74154N

Texas InstrumentsIn Stock: 5400SN74154N Datasheet

Current PartRFQ

CD74HCT154M96

Texas InstrumentsIn Stock: 2284CD74HCT154M96 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74154N is determined by the following critical parameters:

• Functional Equivalence: Decoder/Demultiplexer type with 1 x 4:16 circuit configuration and single independent circuit
• Electrical Compatibility: Single supply voltage operation with overlapping or extended voltage supply range
• Logic Family Compatibility: The substitute must maintain compatible logic levels and switching characteristics
• Package Consideration: The original through-hole 24-DIP package may be substituted with surface-mount alternatives (24-SOIC) when board redesign is feasible
• Compliance Requirements: RoHS3 compliance and unlimited MSL rating maintained across substitutes

The CD74HCT154M96 qualifies as a manufacturer-recommended substitute based on identical circuit configuration (1 x 4:16 decoder/demultiplexer), compatible voltage supply range (4.5V ~ 5.5V encompasses the original 4.75V ~ 5.25V specification), and equivalent functional performance within the 74HCT logic family.

Parameter Comparison

Engineering Selection Recommendations

The CD74HCT154M96 is the manufacturer-recommended substitute for the obsolete SN74154N. Both components maintain ROHS3 compliance and unlimited moisture sensitivity ratings, ensuring regulatory and environmental compatibility.

The primary distinction between these parts is the package format: the SN74154N uses through-hole 24-DIP mounting, while the CD74HCT154M96 employs surface-mount 24-SOIC packaging. Selection between these options depends on board design requirements. Through-hole mounting may be retained by sourcing alternative through-hole decoder/demultiplexer options if surface-mount conversion is not feasible. The CD74HCT154M96 offers extended operating temperature range (-55°C ~ 125°C) compared to the original specification (0°C ~ 70°C), providing broader application flexibility.

Both components are manufactured by Texas Instruments and maintain identical functional specifications for the 1 x 4:16 decoder/demultiplexer circuit configuration, ensuring direct functional replacement capability.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT154M96 directly replace the SN74154N in existing designs?

A: Functional replacement is possible. The CD74HCT154M96 provides identical decoder/demultiplexer functionality with the same 1 x 4:16 circuit configuration. However, the package format differs: SN74154N uses through-hole 24-DIP mounting while CD74HCT154M96 uses surface-mount 24-SOIC. Board redesign is required for surface-mount conversion.

Q: What are the key electrical differences between these parts?

A: The voltage supply range for CD74HCT154M96 (4.5V ~ 5.5V) is broader than the SN74154N (4.75V ~ 5.25V), providing greater supply tolerance. The CD74HCT154M96 supports extended operating temperature range (-55°C ~ 125°C) versus the original 0°C ~ 70°C specification.

Q: Are both parts RoHS compliant?

A: Yes, both the SN74154N and CD74HCT154M96 are ROHS3 compliant with unlimited MSL ratings, meeting current environmental and regulatory requirements.

Q: Why is the SN74154N classified as obsolete?

A: The SN74154N belongs to the legacy 7400 series logic family. Obsolescence reflects the industry transition toward modern logic families and surface-mount packaging technologies. The CD74HCT154M96 represents the active equivalent within the 74HCT series.

Q: What mounting considerations apply when selecting a substitute?

A: The SN74154N requires through-hole PCB design with DIP sockets or direct soldering. The CD74HCT154M96 requires surface-mount PCB layout with SOIC footprints. Package selection depends on existing board design capabilities and manufacturing processes.