The 49SAC20480202040 is a HC-49S RoHS-compliant (Restriction of Hazardous Substances) DIP crystal resonator made by JGHC. It has a 4.0 x 2.0 mm package size with an 80.000MHz center frequency, a fundamental mode, and a 20pF-40pF load capacitance. It is typically used for frequency control, timekeeping, and signal generation in the fields of telecommunications, automotive, industrial, medical, and audio applications.