XD74LS181 – 4-Bit Arithmetic Logic Unit (ALU) / Function Generator – Xinluda

The Xinluda XD74LS181 is a 4-bit Arithmetic Logic Unit (ALU) and function generator in a DIP-24 package, performing 16 logic and 16 arithmetic operations on two 4-bit words with full look-ahead carry. Available for RFQ at Pacific Component Xchange.

The XD74LS181 from Xinluda is a 4-bit Arithmetic Logic Unit (ALU) and function generator, a Low-Power Schottky (74LS) TTL implementation of the classic 74181 architecture. It performs a comprehensive set of arithmetic and logic operations on two 4-bit operands, selected by four function-select lines, making it a foundational building block for processors, controllers, and digital computation circuits. The device supports full internal look-ahead carry generation for high-speed operation on longer words when multiple units are cascaded.

Key Features

• 4-bit Arithmetic Logic Unit (ALU) and function generator
• Performs 16 logic operations on two variables (including AND, NAND, OR, NOR, XOR, XNOR)
• Performs 16 arithmetic operations (including add, subtract, compare, and shift/double)
• Four function-select lines (S0, S1, S2, S3) plus mode control
• Full internal look-ahead carry for high-speed operation on long words (cascadable)
• Low-Power Schottky (74LS) TTL technology
• Operating supply voltage range: 4.75 V to 5.25 V (5 V nominal)
• DIP-24 through-hole package
• RoHS compliant

Applications

• CPU and ALU sections of discrete-logic processors and microcoded designs
• Educational and hobbyist TTL computer builds
• Legacy industrial and instrumentation control boards
• Digital arithmetic and comparison circuits
• Repair and maintenance of vintage / legacy equipment
• FPGA-to-discrete-logic prototyping reference designs

Why Source XD74LS181 from Pacific Component Xchange

The XD74LS181 is a niche 74LS-series logic IC with limited authorized-distributor availability, which makes consistent supply a challenge for repair shops, legacy-equipment manufacturers, and educational programs. Pacific Component Xchange specializes in hard-to-find and obsolete logic and power-management components, helping engineers and buyers secure parts that mainline channels no longer stock in volume.

Every order is backed by our commitment to authenticity and quality, with sourcing diligence and inspection to protect your build against counterfeit or substandard parts. We support global shipping and flexible quantities for both prototype and production needs.

Request a quote (RFQ) for the XD74LS181 today and our sourcing team will respond with current availability, lead time, and pricing. Contact Pacific Component Xchange to lock in supply of this and other hard-to-find logic ICs.