What are Space Qualified Quartz Crystals?

Space Qualified Quartz Crystals are precision frequency control components that utilize the piezoelectric properties of quartz to generate stable oscillations when subjected to an electric field. The crystal is cut and oriented to support a specific vibrational mode, and when incorporated into an oscillator circuit, it defines the output frequency based on its mechanical resonance. In space-qualified designs, material purity, cut geometry, electrode deposition, and mounting structures are tightly controlled to ensure consistent electromechanical coupling and minimal susceptibility to environmental disturbances.

These devices are fundamental to timing, synchronization, and frequency reference functions in spacecraft subsystems, including communication, navigation, and signal processing units. Their performance is governed by intrinsic crystal properties and external loading conditions, with parameters such as capacitance, resistance, and mechanical stability influencing oscillation behavior. Space qualification requires that these characteristics remain stable under thermal cycling, vacuum conditions, mechanical stress, and long-duration operation, ensuring predictable frequency output and minimal drift throughout the mission lifecycle.

Key specifications of space qualified quartz crystal:

• Mode of oscillation: This parameter defines the specific vibrational mode in which the quartz crystal operates, determined by its cut and geometry. It is critical because the oscillation mode directly influences frequency stability, temperature behavior, and energy trapping characteristics, which in turn affect how reliably the crystal maintains its resonance under varying environmental conditions.
• Frequency range: This parameter specifies the span of frequencies over which the crystal is designed to operate. It is important for selection because the achievable frequency depends on the crystal’s physical dimensions and mode of oscillation, and it determines compatibility with the intended oscillator circuit and system timing requirements.
• Frequency tolerance: This parameter represents the allowable deviation of the crystal’s nominal frequency under specified conditions. It matters because it defines the initial accuracy of the frequency reference, influencing synchronization precision, channel spacing, and overall system performance in applications where timing and frequency alignment are critical.
• Aging: This parameter describes the long-term change in the crystal’s resonant frequency over time. It is a key consideration for space applications because gradual drift can accumulate and impact system timing accuracy, making it essential to select crystals with stable material and structural characteristics that minimize long-term frequency variation.
• Equivalent Series Resistance (ESR): This parameter quantifies the effective resistive component of the crystal at resonance. It is significant because ESR influences the startup conditions of the oscillator, energy dissipation, and drive level requirements, and higher resistance can degrade oscillation stability and increase power consumption in the associated circuitry.
• Shunt capacitance: This parameter represents the parasitic capacitance between the crystal electrodes when no mechanical motion occurs. It affects the overall impedance characteristics of the device and plays a role in determining the resonant and anti-resonant frequencies, impacting how the crystal interacts with the external oscillator network.
• Load Capacitance: This parameter defines the external capacitance required for the crystal to oscillate at its specified nominal frequency. It is crucial because deviations in load capacitance alter the effective frequency of operation, making it necessary to match the crystal with the oscillator circuit to achieve accurate and stable frequency output.
• Package type: This parameter describes the physical enclosure and mounting configuration of the quartz crystal. It influences mechanical stability, environmental sealing, thermal behavior, and parasitic effects, all of which affect the crystal’s reliability and performance in space-qualified assemblies.

The Largest Database of Space Qualified Quartz Crystals

SatNow has listed Space Qualified Quartz Crystals from the leading manufacturers and made them searchable by specification. You can enter the key parameters and the search tool will scan catalogs from the leading manufacturers to identify products that meet your spec. Once you find Space Qualified Quartz Crystals that meet your requirement, you can view product information, download datasheets or request quotations. Quotation requests will be routed to the manufacturer of the product who will get back to you directly. The quotation will also be routed to distributors of the product in your region.