Thermal Stress Dynamics in Hermetic Quartz Resonator Packaging
Hermetic quartz packaging performance depends on matching substrate thermal expansion and controlling conductive epoxy shear strain to prevent frequency drift.
AT Cut Resonator
Meaning
A thickness shear mode quartz crystal plate sliced at a specific angle relative to the optical axis of the crystal provides a highly stable reference frequency. The AT cut resonator represents the most widely utilized crystal cut in modern electronics due to its excellent performance over commercial temperature ranges. Its frequency vs temperature curve follows a third-order polynomial, allowing predictable behavior across broad thermal bands.
Thermal Stability
Zero temperature coefficient points are achieved near room temperature and at elevated operational thresholds through precise control of the manufacturing angle. Small deviations in the cutting angle shift these turn points, altering the flat region of the frequency curve. Production batches are sorted by their angle precision to satisfy distinct industrial grades.
Packaging Assembly
Mounting the quartz plate in a ceramic package demands careful isolation from mechanical mounting stresses. Flexible silver epoxy bonds the plate to the conductive terminals to absorb vibrations while maintaining electrical contact. This mechanical isolation protects the frequency of the device from external physical strains during circuit board assembly.
Distributors verify that packaged parts comply with shock standards before shipment.
Supply Pricing
Standard frequencies command low unit prices due to high production volumes. Custom frequencies require longer test times and carry higher acquisition costs.