TDG. 

TDG Holding Co., Ltd., together with its subsidiaries, engages in the research and development, manufacture, and sale of electronic materials, digital devices, and smart equipment in China and internationally. The company offers electronic materials, such as ferrite sheets for NFC antennas; soft ferrite cores for wireless chargers and LED power supplies; soft magnetic cores for automotive electronics, EV wireless charging products, and new energy; cores for EMI suppression and consumer electronics; stress-insensitive, high bias, low core loss, EMI-suppression, and thermal shock resistance NiZn ferrites; metal powder cores; sapphire crystal products; and piezo-electric crystal materials. It also provides high-frequency magnetic components and modules, microwave components and modules, molding choke inductors, and electronic manufacturing services; and powder materials equipment, and crystal material growth and process equipment. TDG Holding Co., Ltd. was founded in 1984 and is headquartered in Haining, China.