SN74LS673N Equivalent & Substitute Parts

Part Overview

The SN74LS673N is a 16-bit serial-in shift register manufactured by Texas Instruments, housed in a 24-DIP through-hole package. This component converts serial input data to parallel output format using tri-state logic. The part is classified as obsolete, making equivalent substitute parts necessary for new designs or when through-hole mounting is not required. The SN74LS673DW provides functional equivalence in a surface-mount configuration.

Substiute Parts

SN74LS673N

Texas InstrumentsIn Stock: 1004SN74LS673N Datasheet

Current PartRFQ

SN74LS673DW

Texas InstrumentsIn Stock: 940SN74LS673DW Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The SN74LS673DW qualifies as a direct functional substitute for the SN74LS673N based on the following criteria:

Electrical Equivalence: Both parts maintain identical logic specifications including 16-bit serial-to-parallel shift register function, tri-state output configuration, single element design, and supply voltage range of 4.75V to 5.25V.

Thermal Compatibility: Operating temperature range remains 0°C to 70°C across both variants.

Compliance Alignment: Both parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity classification (MSL 1).

Series Consistency: Both components belong to the 74LS logic family with the same base product number (74LS673).

Packaging Difference: The primary distinction is mounting type—SN74LS673N uses through-hole 24-DIP packaging, while SN74LS673DW uses surface-mount 24-SOIC packaging. This difference does not affect electrical function but impacts PCB layout and assembly methodology.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS673DW is the direct functional equivalent of the SN74LS673N. Selection between these parts depends on PCB assembly requirements:

Choose SN74LS673N when through-hole mounting is mandated by existing PCB design or assembly infrastructure.

Choose SN74LS673DW for new designs, surface-mount assembly processes, or space-constrained applications. The active product status of the SN74LS673DW ensures ongoing availability and supply chain stability compared to the obsolete SN74LS673N.

Both parts meet ROHS3 compliance and carry identical electrical specifications, ensuring functional interchangeability within the specified voltage and temperature operating ranges.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS673DW directly replace the SN74LS673N in an existing circuit?

A: Yes, electrically. Both parts provide identical 16-bit serial-to-parallel shift register functionality with tri-state outputs and matching supply voltage requirements. PCB layout modification is required due to different package types (24-DIP versus 24-SOIC).

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

A: The SN74LS673N uses through-hole 24-DIP packaging for manual or wave soldering assembly. The SN74LS673DW uses surface-mount 24-SOIC packaging for automated pick-and-place assembly. All electrical parameters remain identical.

Q: Why is the SN74LS673N listed as obsolete?

A: The SN74LS673N has reached end-of-life status. The SN74LS673DW remains in active production, making it the recommended choice for new designs and long-term supply availability.

Q: Are there any compliance differences between these parts?

A: No. Both parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity classification (MSL 1).

Q: What are the pin-count and voltage specifications?

A: Both parts feature 24 pins and operate within a 4.75V to 5.25V supply voltage range across an operating temperature of 0°C to 70°C.