X49UD45MSD2SC is an electronic part manufactured by Yangxing, a leading supplier of high-precision, high-stability quartz crystals and crystal oscillators. This part is a 49U 4.5MHz ±20ppm HC-49U RoHS quartz crystal with a built-in integrated circuit, a metal case and a ceramic package, making it ideal for use in a variety of electronic technologies, including radio frequency (RF) systems, clock oscillators, microprocessors, and more. The high stability of the crystal combined with its RoHS certification makes this a reliable and safe component for many applications.