FC1610AN32.7680KA-AC3 is a 32.768 kHz crystal unit designed for small communications devices and low-power timing applications. It operates at a nominal frequency of 32.768 kHz with a frequency tolerance of ±20 × 10?6 at +25°C and a drive level of 0.1 µW typical (0.5 µW maximum). The unit features an extremely compact form factor of 1.65 × 1.05 × 0.5 mm with a fundamental overtone order, making it ideal for space-constrained applications. It operates reliably across a temperature range of -40°C to +85°C with a storage range of -55°C to +125°C, and exhibits excellent frequency stability with an aging rate of ±3 × 10?6 per year. This crystal is widely used in real-time clock circuits, wearable devices, and portable communication equipment where low power consumption and miniaturization are critical requirements.