FA-20H16.0000MF12Z-AC0 is a MHz-range crystal unit designed for RF reference and clock applications across the 12–54 MHz frequency range. The device features a compact surface-mount package with external dimensions of 2.5 × 2.0 × 0.55 mm and operates on fundamental overtone principles. It supports RF reference applications with a maximum drive level of 100 µW, frequency tolerance of ±10 × 10?6 at +25°C, and motional resistance (ESR) specifications ranging from 150 O (12–16 MHz) to 40 O (35–54 MHz). The crystal operates reliably across a temperature range of -40°C to +85°C (with extended operation to +105°C available), with frequency stability maintained within ±10 × 10?6 across -20°C to +75°C. This unit is ideal for mobile phones, Bluetooth modules, W-LAN systems, ISM band radios, and microprocessor clock applications, offering Pb-free and RoHS-compliant construction for modern electronic designs.