Sterling Semiconductor, Inc. is a leading developer and manufacturer of silicon carbide (SiC) substrates based in Danbury, Connecticut, USA. Founded in 2003, the company focuses on advanced wide-bandgap materials for power electronics and RF/microwave devices. Its primary products are 4H and 6H polytype SiC wafers, available in n-type and semi-insulating grades with diameters up to 150 mm. Sterling is known for its proprietary crystal growth and polishing technologies that achieve low defect densities and high surface quality. These SiC substrates enable high-efficiency, high-temperature power modules and high-frequency GaN-on-SiC amplifiers. The company serves applications in electric vehicles, renewable energy systems, 5G infrastructure, and industrial motor drives. In 2018, Sterling was acquired by II-VI Incorporated (now Coherent Corp.), leveraging synergies with II-VI's global manufacturing and optical materials expertise. Despite the acquisition, the Sterling brand remains recognized for quality SiC substrates, contributing to the growing SiC ecosystem. Its products address the increasing demand for energy-efficient semiconductors in a carbon-conscious world.