SN74LS181N Equivalent & Substitute Parts

Part Overview

The SN74LS181N is an Arithmetic Logic Unit (ALU) IC manufactured by Texas Instruments in 24-DIP packaging. This component is classified as obsolete, indicating it is no longer in active production. The SN74LS181N performs arithmetic and logic operations as a fundamental building block in digital systems. Due to its obsolete status, identifying functionally equivalent substitute parts is essential for system redesign, legacy equipment repair, and production continuity.

Substiute Parts

SN74LS181N

Texas InstrumentsIn Stock: 3504SN74LS181N Datasheet

Current PartRFQ

SN54LS181J

Texas InstrumentsIn Stock: 755SN54LS181J Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS181N is determined by the following critical parameters:

• Functional Equivalence: Both parts must perform identical Arithmetic Logic Unit operations
• Package Compatibility: Physical form factor must accommodate 24-DIP through-hole mounting
• Electrical Specifications: Supply voltage range and operating temperature must support the application requirements
• Logic Family: Both parts belong to the 74LS logic family, ensuring TTL-compatible signal levels and timing characteristics
• Compliance Standards: RoHS3 compliance and REACH unaffected status must be maintained

The SN54LS181J qualifies as a manufacturer-recommended substitute based on these criteria. Both parts share identical functional architecture as Arithmetic Logic Units with 24-pin DIP packaging and through-hole mounting. The primary differences lie in operating temperature range and supply voltage specifications, which reflect different qualification standards rather than functional capability differences.

Parameter Comparison

Engineering Selection Recommendations

The SN54LS181J is the manufacturer-recommended substitute for the obsolete SN74LS181N. Both components maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for new designs and production environments.

The SN54LS181J offers extended operating temperature range (-55°C to 125°C) compared to the SN74LS181N (0°C to 70°C), providing broader environmental capability. The SN54LS181J also features a wider supply voltage tolerance (4.5V to 5.5V) versus the SN74LS181N (4.75V to 5.25V), allowing operation across a broader power supply range.

The active product status of the SN54LS181J ensures ongoing availability and manufacturing support, eliminating supply chain risk associated with the obsolete SN74LS181N. Both parts share identical 24-pin DIP through-hole packaging, enabling direct physical substitution without PCB redesign.

Frequently Asked Questions (FAQ)

Q: Can the SN54LS181J directly replace the SN74LS181N in existing designs?

A: Yes. Both parts are 24-pin DIP through-hole Arithmetic Logic Units with identical functional architecture. Physical substitution requires no PCB modifications. Verify that your application's operating temperature and supply voltage requirements fall within the SN54LS181J specifications.

Q: What is the difference between 24-DIP and 24-CDIP packaging?

A: Both designations refer to 24-pin Dual Inline Package with 0.600" (15.24mm) body width suitable for through-hole mounting. The CDIP variant indicates ceramic material composition. Both are mechanically and electrically compatible for board-level substitution.

Q: Why is the SN74LS181N classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Texas Instruments. The SN54LS181J represents the active production alternative, offering equivalent functionality with extended environmental specifications and ongoing supply availability.

Q: Are there compliance differences between the two parts?

A: No. Both the SN74LS181N and SN54LS181J maintain ROHS3 compliance and REACH unaffected status. Regulatory requirements are satisfied by either component in new designs and manufacturing environments.

Q: What operating conditions favor the SN54LS181J over the SN74LS181N?

A: Applications requiring extended temperature operation (-55°C to 125°C) or broader supply voltage tolerance (4.5V to 5.5V) benefit from the SN54LS181J specifications. The SN74LS181N is limited to 0°C to 70°C operation and 4.75V to 5.25V supply range.