Temperature Compensated Crystal Oscillators (TCXOs) are expected to remain the most sought-after type, accounting for a share of 38% in 2026, because of their superior frequency stability and widespread use in telecom infrastructure, smartphones, and GPS devices. In the high-speed operation of 5G base stations and AI data centers, optical modules serve as information transmission hubs, and behind them lies an "invisible key component" - the quartz crystal oscillator (quartz crystal oscillator). A-Crystal Technology has been deeply engaged in this field. Although quartz crystal oscillators account for only a small proportion (1%–5%) in optical modules, they are critical components that ensure the stable operation of high-speed optical communication systems. 2 billion in 2026 and reach USD 4. 1% CAGR during the study period. By frequency type, the MHz range segment registers 52. In terms of mounting type, the surface mount technology. Crystal Oscillator Market, By Type (Temperature Compensated Crystal Oscillator (TCXO), Simple Packaged Crystal Oscillator (SPXO), Voltage-controlled Crystal Oscillator (VCXO), Frequency-controlled Crystal Oscillator (FCXO), Oven-controlled Crystal Oscillator (OCXO), Other Types), By Mounting Type. Global MEMS & Crystal Oscillators Market size was valued at USD 4400.