FC-13532.7680KA-K3 is a kHz-range crystal unit manufactured by Seiko Epson for precision frequency control in compact electronic devices. The unit operates at a nominal frequency of 32.768 kHz with a frequency tolerance of ±20 × 10?6 at +25°C and a load capacitance of 12.5 pF. It features a motional resistance (ESR) of 70 kO maximum, motional capacitance of 3.4 fF typical, and shunt capacitance of 1.0 pF typical, with a frequency aging rate of ±3 × 10?6 per year maximum. The crystal operates over a temperature range of -40°C to +85°C with a storage temperature range of -55°C to +125°C, and exhibits a parabolic temperature coefficient of -0.04 × 10?6 / °C maximum. This fundamental-mode crystal is ideal for real-time clock applications, wearable devices, and small communications equipment where compact size and reliable frequency stability are essential.