Miniature Atomic Clock (MAC – SA5X) is only 2 x 2″

https://www.electronics-lab.com/miniature-atomic-clock-mac-sa5x-2-x-2/

Miniature Atomic Clock (MAC – SA5X) Rubidium Oscillator, re-designed for improved stability and new features. The MAC-SA5X is designed for applications that require long-term atomic oscillator stability, but are constrained by size and low power requirements. Versatile Microchip’s next-generation MAC-SA5X miniaturized rubidium atomic clock produces a stable time and frequency reference that maintains a high […]