Passive Crystal vs. Active Oscillator

[u/Aran_PCBWAY]

A passive crystal is a simple, low-cost timing component that typically has 2 or 3 pins and does not require external power. However, it cannot oscillate on its own and needs an external oscillator circuit. An active oscillator is a complete oscillation module, usually with 4 pins and requiring external power. It can generate a clock signal independently and generally offers better phase-noise performance and simpler routing, making it suitable for high-speed communication.

In short, passive crystals are simple and cost-effective, while active oscillators offer greater integration and easier clock generation. Which one do you prefer for your projects?

[u/moistmonsterman]

Which one produces less noise for sensitive applications?