The FC-13532.7680KA-K0 is a kHz-range crystal unit manufactured by Seiko Epson Corporation for precision timing applications. It operates at a nominal frequency of 32.768 kHz with fundamental overtone order and features external dimensions of 3.2 × 1.5 × 0.9 mm, making it suitable for compact device integration. The unit exhibits a frequency tolerance of ±20 × 10?6 at +25 °C with a drive level of 0.5 µW (1.0 µW maximum), and supports load capacitance options of 7 pF, 9 pF, or 12.5 pF. Operating temperature range extends from -40 °C to +85 °C with storage capability from -55 °C to +125 °C, while frequency aging remains within ±3 × 10?6 per year. This crystal unit is ideal for small communications devices, real-time clocks, and portable electronics requiring stable, low-power timing references.