Summary of MINIATURE ATOMIC CLOCK (MAC – SA5X) IS ONLY 2 X 2″
The MAC-SA5X is a next-generation miniature rubidium atomic clock designed for applications requiring high stability within strict size and power limits. It offers improved thermal performance, fast warm-up times, and sub-microsecond holdover during GNSS outages. Measuring just 2x2 inches, it is five times smaller than traditional lamp-based oscillators while maintaining synchronization despite g-forces or temperature fluctuations.
Parts used in the Miniature Atomic Clock (MAC – SA5X):
- Miniature Atomic Clock (MAC – SA5X) Rubidium Oscillator
- PCBA (Printed Circuit Board Assembly)
- GNSS-derived signal reference
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 degree of synchronization to a reference clock, such as a GNSS-derived signal, despite static g-forces or other factors. Its combination of low monthly drift rate, short-term stability and stability during temperature changes allow the device to maintain precise frequency and timing requirements during extended periods of holdover during GNSS outages or for applications where large rack-mount clocks are not possible.
Compact Design
Sharing an identical form factor with the Legacy MAC, measuring only 2 inch by 2 inch and standing less than an inch – it is five times smaller than traditional lamp-based rubidium oscillators. Its pins allow it to be mounted to PCBA’s.
Improved Operation
It has been designed for fast warm-up times in a variety of thermal environments, wider operational temperature range and improved stability performance.
Low Temperature Sensitivity
With a max frequency deviation of <5E-11 during large temperature changes, along with improved long-term drift rates, the MAC-SA5X is capable of sub-microsecond holdover for many days in variable environments.
Read more: MINIATURE ATOMIC CLOCK (MAC – SA5X) IS ONLY 2 X 2″
- What is the primary application of the MAC-SA5X?
It is designed for applications requiring long-term atomic oscillator stability with constraints on size and low power. - How does the device handle static g-forces?
It maintains a high degree of synchronization to a reference clock despite static g-forces or other factors. - What are the physical dimensions of the MAC-SA5X?
It measures only 2 inch by 2 inch and stands less than an inch. - Can the MAC-SA5X be mounted directly to a board?
Yes, its pins allow it to be mounted to PCBA's. - How does the frequency deviation perform during large temperature changes?
The max frequency deviation is less than 5E-11 during large temperature changes. - What is the holdover capability in variable environments?
The device is capable of sub-microsecond holdover for many days in variable environments. - Does the MAC-SA5X have a faster warm-up time?
Yes, it has been designed for fast warm-up times in a variety of thermal environments. - Is the MAC-SA5X smaller than traditional rubidium oscillators?
Yes, it is five times smaller than traditional lamp-based rubidium oscillators.
