The X1G004171001900 is an SMD Oscillators (XO) 12.288MHz SMD-2520_4P RoHS manufactured by Epson. It is a type of clock oscillator module designed for surface mount technology (SMT) applications. The module is made up of 4 pins, with a RoHS (Restriction of Hazardous Substances) certification, which makes it compliant with European environmental regulations. It has a frequency of 12.288MHz, making it suitable for timing applications such as clock and frequency systems based on timing, as well as other high-frequency applications. Besides, it has an operating temperature range of -40°C to +85°C, making it suitable for automated mounting in high temperature environments.