The C25000J365 with SMD Crystal Resonators 25MHz ±20ppm HC-49SMD RoHS is a small, surface-mount crystal resonator manufactured by East Crystal. It is specifically designed to oscillate at a frequency of 25MHz, with a tolerance of ±20ppm (parts per million). This component is RoHS-compliant (Restriction of Hazardous Substances), meaning it does not contain any hazardous substances like lead, mercury, cadmium, or other potentially dangerous substances. It is suitable for a range of applications, particularly those that require precise frequency control.