Altium Limited, founded in 1985 as Protel Systems, is a global electronic design automation (EDA) company headquartered in Sydney, Australia. It specializes in printed circuit board (PCB) design software that unifies the entire electronics design process. The company's flagship product, Altium Designer, provides a comprehensive environment for schematic capture, PCB layout, simulation, and manufacturing outputs. Altium also offers Altium 365, a cloud-based platform enabling real-time collaboration and component management for distributed design teams. Additional tools include Altium Concord Pro for enterprise component data management and the Altium 365 Viewer for sharing designs. Altium is recognized for pioneering native 3D PCB design, advanced auto-routing, and seamless integration between electrical and mechanical domains. It serves a diverse customer base ranging from large corporations to individual makers, holding a strong position in the PCB design software market alongside Cadence and Siemens EDA. The company went public on the Australian Securities Exchange in 1999 and later expanded through acquisitions of ACCEL Technologies, Metamor, and others. In 2024, Altium was acquired by Renesas Electronics Corporation, forming a combined offering of semiconductor solutions and EDA tools. Altium’s mission is to make electronics design accessible, enabling anyone to turn ideas into intelligent electronic products.