AKER - aker-usa.com 11-3 Chien-Kuo Rd T.E.P.Z. 4027 Taiwan ROC C6S-20.000-12-3030-X Manual

The document describes a 6 x 3.5 mm SMD quartz crystal unit with a nominal frequency of 20.000 MHz, fundamental mode of oscillation, ±30 PPM frequency tolerance, operating temperature range of -40 to +85 º C, 12 pF load capacitance, 50 Ohms equivalent series resistance, and other characteristics.