This SMD Crystal Resonator with the C27000J017 identifier is a 27MHz ±20 ppm HC-49SMD Crystal Resonator manufactured by East Crystal. It is made specifically for Surface Mount Applications, making it ideal for use in very tight-spaced designs. It is a RoHS compliant part, making it strongly compliant with the European Union's Restriction of Hazardous Substances Directive, and is designed to ensure a RoHS-compliant, safe product that is free from material that could be hazardous to health.