The FC-13532.7680KA-AC5 is a kHz-range crystal unit manufactured by Seiko Epson Corporation, operating at a nominal frequency of 32.768 kHz in fundamental overtone mode. It features compact external dimensions of 3.2 × 1.5 × 0.9 mm with a motional resistance (ESR) of 70 kO maximum, motional capacitance of 3.4 fF typical, and shunt capacitance of 1.0 pF typical. The device operates over a temperature range of -40°C to +85°C with a storage range of -55°C to +125°C, maintaining a frequency tolerance of ±20 × 10?6 at +25°C and a frequency aging rate of ±3 × 10?6 per year maximum. With a drive level of 0.5 µW and available load capacitance options of 7 pF, 9 pF, and 12.5 pF, this crystal unit is ideal for small communications devices, real-time clocks, and portable electronic applications requiring precise timing in a minimal footprint.