SJ Semi

SJ Semi operates as a specialized intermediary and service provider within the secondary market for semiconductor manufacturing equipment and components. The firm, led by CEO Johnny Choi, focuses on sourcing and supplying used semiconductor equipment, providing a cost-effective alternative for its clients compared to purchasing new machinery. This market is substantial, valued at over $4.4 billion in 2025 and projected to grow significantly, driven by high capital costs for new equipment and the need for legacy system support.

The company's business model is centered on leveraging deep industry expertise to facilitate the buying and selling of pre-owned equipment. This includes skillful handling of the entire process, from disassembly and shipping to packaging and export logistics. By monitoring market trends, SJ Semi provides clients with current information, enabling them to procure equipment at reasonable prices. The firm maintains an inventory of equipment and parts, and its services are designed to support clients in the electronics, automotive, and telecommunications industries who rely on semiconductor devices.

SJ Semi's clientele consists of companies within the semiconductor ecosystem that are looking to manage capital expenditures or source parts for older manufacturing lines. The value proposition lies in providing access to a global market of used equipment with professional handling and market intelligence. The company operates an eBay store and a direct business-to-business service, offering parts and equipment from various manufacturers. Based in Gyeonggi-do, South Korea, SJ Semi positions itself as a trusted partner that grows alongside its clients by navigating the dynamic and advanced semiconductor market.

Keywords: used semiconductor equipment, pre-owned semiconductor parts, secondary equipment market, semiconductor manufacturing, equipment sourcing, electronics manufacturing, fab equipment, wafer fabrication tools, semiconductor logistics, equipment refurbishment, semiconductor auction, industrial machinery, capital equipment, test and assembly equipment, clean room equipment, die prep tools, wafer testing, equipment brokerage, asset management, electronics components