FC-13532.7680KA-AC0 is a kHz-range crystal unit manufactured by Seiko Epson for precision timing applications in small communications devices. The unit operates at a nominal frequency of 32.768 kHz with a fundamental overtone order and features an external dimension of 3.2 × 1.5 × 0.9 mm, making it suitable for compact electronic designs. Key technical characteristics include a frequency tolerance of ±20 × 10?6 at +25°C, motional resistance (ESR) of 70 kO maximum, and available load capacitance options of 7 pF, 9 pF, and 12.5 pF. The device operates reliably across a temperature range of -40°C to +85°C with a storage range of -55°C to +125°C, and exhibits frequency aging of ±3 × 10?6 per year maximum. This crystal unit is ideal for real-time clock applications, portable communication devices, and other timing-critical systems requiring low-power, stable frequency references.