SN74LS181NG4 Equivalent & Substitute Parts

Part Overview

The SN74LS181NG4 is an Arithmetic Logic Unit (ALU) IC manufactured by Texas Instruments, designed for 24-pin DIP through-hole applications. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing system maintenance and new design implementations. The part operates within a 4.75V to 5.25V supply voltage range and supports industrial temperature specifications from 0°C to 70°C.

Substiute Parts

SN74LS181NG4

Texas InstrumentsIn Stock: 792SN74LS181NG4 Datasheet

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SN54LS181J

Texas InstrumentsIn Stock: 755SN54LS181J Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS181NG4 is determined by the following critical parameters:

• Logic Function: Both parts must implement Arithmetic Logic Unit functionality
• Package Type: Physical compatibility requires 24-pin DIP configuration with 0.600" (15.24mm) spacing
• Mounting Technology: Through-hole mounting compatibility
• Supply Voltage Range: Operating voltage specifications must accommodate system requirements
• Temperature Rating: Operating temperature range must meet application demands
• Compliance Standards: RoHS3 and REACH compliance status

The SN54LS181J qualifies as a substitute based on identical logic function, compatible 24-pin DIP package configuration, and through-hole mounting. Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment.

Parameter Comparison

Engineering Selection Recommendations

The SN54LS181J serves as a direct substitute for the obsolete SN74LS181NG4 based on functional equivalence and regulatory compliance. The substitute part maintains active product status with Texas Instruments, ensuring long-term availability and supply chain continuity. Both components satisfy ROHS3 and REACH compliance requirements, supporting regulatory obligations in manufacturing and distribution.

The SN54LS181J provides an extended operating temperature range (-55°C to 125°C) compared to the original part (0°C to 70°C), and a broader supply voltage tolerance (4.5V to 5.5V versus 4.75V to 5.25V). These expanded specifications offer enhanced flexibility for applications requiring wider environmental operating conditions.

Frequently Asked Questions (FAQ)

Q: Can the SN54LS181J directly replace the SN74LS181NG4 in existing designs?

A: Yes. Both parts implement identical Arithmetic Logic Unit functionality within compatible 24-pin DIP through-hole packages. Electrical and mechanical compatibility is established through matching logic type, package configuration, and pin spacing.

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

A: Both designations refer to 24-pin Dual Inline Package configurations with 0.600" (15.24mm) spacing suitable for through-hole mounting. The packaging difference does not affect functional or electrical compatibility for this application.

Q: Does the extended temperature range of the SN54LS181J affect compatibility?

A: No. The SN54LS181J operating range (-55°C to 125°C) encompasses the original part's range (0°C to 70°C). Extended specifications provide additional operational flexibility without compromising compatibility with existing system requirements.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the SN74LS181NG4 and SN54LS181J maintain ROHS3 compliance and REACH unaffected status, satisfying current regulatory requirements for electronic component manufacturing and distribution.

Q: Why is the original SN74LS181NG4 marked as obsolete?

A: Obsolete status indicates the manufacturer has discontinued active production. The SN54LS181J, maintained in active production status, provides continuity for applications requiring Arithmetic Logic Unit functionality in 24-pin DIP configuration.