The XD74LS181 is a type of integrated circuit that is part of the 74 Series logic family. It is a 24-pin dual 4-bit arithmetic logic unit (ALU)—an electronic component that performs arithmetic and logic operations on binary numbers—and is made with Discrete Input-Output (DIP) packaging. It has been manufactured by XINLUDA according to the Restriction of Hazardous Substances (RoHS) standards, which signify that the product is free from hazardous waste and heavy metals such as lead, cadmium and mercury. The XD74LS181 features basic arithmetic functions such as addition, subtraction, and comparison, as well as logic operations such as OR, AND, NOT, NAND, and NOR. It is designed to work with as low as 3.3VBAC supply voltage, making it suitable for both TTL and CMOS ICs. The XD74LS181 is widely used in industrial control, communication, and other digital logic applications in fields such as automotive electronics and medical applications.