- Yamaha video ICs, datacom ICs, audio ICs
- YAMAR Electronics Ltd communications on battery power lines
- Yangtze Memory Technologies Co., Ltd. [YMTC] DRAMs
- YEN-RICH TECHNOLOGY CORPORATION mini LEDs
• a subsidiary of EPISTAR Corporation
- Yiguang China Company LEDs, phototransistors
- Yingli Solar photovoltaics, Monocrystalline Silicon
- Ying Feng Optoelectronics [Shenzhen Ying Feng Optoelectronics Co., Ltd. ] LEDs including Infrared & Ultraviolet diodes
- Yiow Chie Industrial Co., Ltd. LED lamp displays, SMD, dot matrix, Arrays, cluster, DIODE, thermal cutoffs and connectors
- YMTC [Yangtze Memory Technologies Co., Ltd. ] DRAMs
- Ynvisible Interactive Inc. flexible displays
- Young Fast Optoelectronics Co., Ltd. Touch Panels
- Young Tek [YTEC] GPS modules
- Yozan Japan integrated circuits
- YTEC [Young Tek] GPS modules
- Yugo Systems FPGA debugging
- Yunnan Crystaland LEDs
• acquired by HC Semitek Corporation
- Yunnan OLiGHTEK Opto-Electronic Technology Co., Ltd. OLED displays & drivers
- Yunnan Semiconductor photovoltaics, Monocrystalline Silicon
- Yunsun [China Yunsun LED Lighting Co., Ltd. ] LED lighting
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