FA-118T Crystal Units Epson Timing FA-118T Crystal Units offer a 24MHz to 54MHz frequency range and up to 200Ω motional resistance. These units feature a fundamental overtone, external dimensions of 1.6mm x 1.2mm x 0.35mm, and a -40°C to +85°C operating temperature range. Epson Timing FA-118T Crystal Units are ideal for mobile phones, BLUETOOTH®, and W-LAN ISM band radios.