SC-cut crystals represent the pinnacle of precision timing, offering exceptional frequency stability and aging performance as low as 0.1 ppm/year. However, their higher Equivalent Series Resistance (ESR) introduces specific design hurdles that engineers must address. This overview examines the impac... read more

Internal contamination remains a critical threat to the long-term aging performance of SC-cut crystals in Oven Controlled Crystal Oscillators (OCXOs). Despite their inherent stress-compensated design, impurities from outgassing materials, moisture ingress, or manufacturing residues can accelerate fr... read more

SC-cut crystals deliver dramatically better aging performance than AT-cut crystals in OCXOs, making them the top choice for high-precision frequency control. Their stress-compensated design reduces sensitivity to mechanical and thermal stress, while lower mounting and plating stresses minimize long-... read more

This article compares SC-cut and AT-cut crystal aging performance for OCXOs. SC-cut crystals deliver a superior aging rate of ~0.1 ppm/year—ten times better than AT-cut at ~1 ppm/year. Over five years, SC-cut drifts only ~0.5 ppm versus ~5 ppm for AT-cut. Thanks to stress compensation, SC-cut minimi... read more