Meaning
Hermetic sealing performance represents the primary method for protecting sensitive electronic components from environmental degradation. The internal cavity pressure within a sealed oscillator housing determines the level of atmospheric damping acting on the resonating element.
Atmospheric Control
Gas composition and density must be tightly controlled during the final packaging phase. High internal cavity pressure increases the collisions between gas molecules and the vibrating crystal, which degrades the quality factor of the resonator. To prevent this degradation, high-vacuum or inert gas backfilling is performed prior to the final weld or solder seal.
The presence of a vacuum ensures that the crystal vibrates with minimal energy loss.
Hermetic Reliability
Seal degradation over time allows atmospheric gases to leak into the package, raising the pressure. This leak rate is monitored using helium leak detection and residual gas analysis to ensure long-term stability. An increase in the internal cavity pressure can lead to frequency drift and premature component failure.
This makes hermetic integrity a central metric for components used in high-reliability industrial and aerospace applications.
Distribution Agreement
Supplier warranties in distribution contracts must specify the allowable leak rate and pressure limits. If a shipment of resonators exhibits a rising internal cavity pressure during quality audits, the distributor is entitled to reject the batch. The agreement defines the specific testing standards and the sample sizes to be used for these audits.
These testing protocols ensure that any vacuum degradation is detected before the components are integrated into larger sub-assemblies, protecting both the distributor and the end customer from costly recalls.
