The X49SM6MSD2SC is a SMD (Surface Mount Device) crystal resonator manufactured by Yangxing. This component provides very precise frequency stability and performance in a small size. The resonator operates at a frequency of 6 MHz (megahertz) and has an accuracy of ± 20 ppm (parts per million). The package type is HC-49 SMD and it is RoHS compliant, meaning that it does not contain restricted substances, such as lead, mercury, cadmium, hexavalent chromium, PBB, PBDE, and DEHP.