FC-13532.7680KA-AG5 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 electrical characteristics include a motional resistance (ESR) of 70 kO maximum, motional capacitance of 3.4 fF typical, shunt capacitance of 1.0 pF typical, and frequency tolerance of ±20 × 10?6 at +25°C with a drive level of 0.1 µW. 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 high stability and miniaturization.