- X-Celeprint Inc. Micro-Transfer Printing (µTP)
- X-Display a subsidiary of X-Celeprint Inc. micro-LED displays
- X-FAB Semiconductor Foundries AG mixed-signal wafer foundry
- X-REL [X-REL Semiconductor SAS] high temperature integrated circuits (ICs)
- X-REL Semiconductor SAS [X-REL] high temperature integrated circuits (ICs)
- Xan3D hybrid ICs
- Xanadu Quantum Technologies photonic quantum chips
- Xanic Limited MMICs operating in the frequency band 50GHz-500GHz
- Xanoptix, Inc. now Xan3D
- XaQti Corp. networking processors
• acquired by Vitesse Semiconductor Corp. • Vitesse Semiconductor Corp. acquired by Microsemi Corp.
• Microsemi Corporation acquired by Microchip Technology Inc.
- Xceive Corporation TV tuner ICs
• acquired by Cresta Technologies Corporation
- Xceler Systems Inc. processors
- XCOM advanced wireless technologies
- Xecom telecontrollers, modem modules
- Xelerated Inc. network processors
• acquired by Marvell Technology Group Ltd.
- XenICs infrared detectors
- Xemics SA microcontrollers, DSP, receivers/transceivers
• acquired by Semtech Corporation
- Xemod Inc. RF power products for wireless networks
• acquired by Sirenza Microdevices
- Xentec semiconductor cores
• acquired by inSilicon
- XeThru by Novelda radar sensors
- Xi'an LONGi Silicon Materials Corp.
• now known as LONGi Green Energy Technology Co. Ltd
- Xiamen Changelight Co., Ltd. LEDs, epitaxial wafers and chips, gallium arsenide solar cells
- Xiamen IMSEMI Technology Co., Ltd. [imSemi] civil millimeter wave radar MMICs
- Xiamen Ocular LCD Devices Co., Ltd. LCD display
- Xiamen Powerway Advanced Material Co., Ltd. [PAM-XIAMEN] epitaxial wafers
- Xiamen Sanan Integrated Circuit Co., Ltd. [SAIC] microwave radio frequency, high power electronics, MOCVD
- Xicor Inc. EEPROMS, flash, NOVRAMs, microperipherals
• acquired by Intersil Corp.
- Xignal Technologies AG communications
- Xilient Inc. digital media
- Xilinx Inc. FPGA, CPLD
• acquired by Advanced Micro Devices [AMD]
- XinaBox modular electronics
- Xinguang Silicon
- Xintec Inc. 3D Wafer Level Chip Scale Packaging
- XINYI Technology Ltd. CMOS based NB-IoT SoCs
- Xinyuan Semiconductor Co. Ltd. [>Wuhan Xinyuan Semiconductor Co. Ltd.] computing-in-memory chips, MCUs, RF semiconductors
- Xirrus Inc. wireless communications
- XMC [Wuhan Xinxin Semiconductor Manufacturing Corporation] wafers
• a member of Tsinghua Unigroup Ltd.
- xMEMS Labs MEMS microspeaker
- XMOS Semiconductor Ltd. processors
- XNOR AI Inc. AI platforms
• acquired by Apple Inc.
- Xperi Corporation audio & imaging
- Xpliant Inc.
• acquired by Cavium Inc.
- Xponent Photonics Inc [a Hoya Company] surface mount photonics
- XSEMI Corporation [Guochuang Semiconductor] regulators, converters, chargers, drivers
- Xsens Technologies B.V. motion trackers, sensor modules
• acquired by Fairchild Semiconductor International Inc.
• Fairchild Semiconductor International Inc. acquired by ON Semiconductor
• Xsens Technologies B.V. acquired by mCube Inc. owned by MediaTek Incorporation
- Xsight Labs chipset designs
- Xsilon Ltd. in-home connectivity
- Xtek Semicon wafer reclaim
- XtremeSpectrum Inc. communications
- Xunlight Corporation thin-film silicon based solar cells & PV modules
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