Single Crystal Quartz Wafers
AT/ST-cut quartz wafers engineered for frequency control, designed for stability at near-zero temperature coefficient conditions, with Q > 10⁶ for demanding applications.
Overview
Quartz is a piezoelectric α-SiO₂ crystal, and AT-cut wafers deliver near-zero temperature coefficient at 25°C for strong frequency stability. With Q > 10⁶ (> 2 × 10⁶ in vacuum), they support high-performance oscillators and SAW/BAW devices.
We supply 100–150mm quartz wafers in thicknesses from 100μm–500μm, with RMS < 0.5nm, TTV ≤ 3μm, and Bow ≤ 15μm. Finishes such as SSP/DSP, lapped, and CMP are available, and each wafer ships in a vacuum-sealed single-wafer cassette in Class 100 cleanroom conditions.
AT-cut f ≈ 1,670/t(μm) for frequency calculation, with a near-zero temperature coefficient for stable performance around 25°C.
AT-cut vs. ST-cut
Choose the crystal cut that matches your performance targets. Compare key parameters like turnover temperature, frequency behavior, and SAW/TCD characteristics to optimize oscillators, filters, and timing devices.
AT-cut (35°15′)
Frequency-Stable Oscillator Grade
AT-cut offers a near-zero temperature coefficient at ~25°C. f ≈ 1,670 / t (μm); ideal for oscillators and filters.
ST-cut (42°45′)
Zero-TCD SAW Substrate
ST-cut delivers SAW velocity ~3,158 m/s and TCD ~0 ppm/°C at 25°C. Best for SAW filters and delay lines.
Hydrothermal Growth & Synthesis
Synthetic quartz grown hydrothermally in autoclaves at high temperature and pressure
Natural quartz mined and swept; both provide single-crystal α-SiO₂ with low defect density
GINECHIP sources and processes wafers with controlled seed orientation for AT/ST/BT/CT/DT/X/Y/Z cuts
Frequency & Temperature Stability
AT-cut cubic frequency-temperature curve, near-zero at 25°C, stability across -20°C to +70°C
Q > 10⁶, up to 2 × 10⁶ in vacuum; low aging for precision timing
SAW & BAW Devices
SAW: ST-cut surface acoustic wave devices, ~3,158 m/s velocity, TCD ~0 ppm/°C
BAW: bulk acoustic wave resonators on AT-cut, fundamental and overtone modes
Frequency range 1 MHz–2.5 GHz covering oscillators, filters, resonators, sensors
Specifications
| Parameter | Available Range / Values |
|---|---|
| Material | Single-crystal α-SiO₂ (Quartz), synthetic or natural |
| Cut Orientation | AT-cut (35°15′), ST-cut (42°45′), BT-cut, CT-cut, DT-cut, X-cut, Y-cut, Z-cut |
| Diameter | 100mm (4″), 150mm (6″) |
| Thickness | 100μm–500μm, frequency-specific lapping |
| Surface Polish | SSP, DSP, lapped, or CMP-finished |
| Surface Roughness | RMS < 0.5nm for polished wafers |
| TTV | ≤ 3μm |
| Bow / Warp | Bow ≤ 15μm |
| Density | 2.65 g/cm³ |
| Piezoelectric Coupling (k²) | ≈ 0.11% (AT-cut fundamental mode) |
| Q-Factor | > 10⁶ for AT-cut, > 2 × 10⁶ in vacuum |
| Temperature Coefficient | AT-cut: near-zero at 25°C (cubic frequency-temperature curve) |
| Frequency Range | 1 MHz–2.5 GHz via fundamental and harmonic (overtone) modes |
| CTE (perpendicular to Z) | 13.7 × 10⁻⁶/K |
| Refractive Index | nₒ = 1.544, nₑ = 1.553 @ 589nm |
| Packaging | Vacuum-sealed single-wafer cassette, Class 100 cleanroom |
Typical Applications
SAW Filters
ST-cut substrates with ~3,158 m/s SAW velocity and TCD ~0 ppm/°C for band-pass filters and duplexers in mobile and RF front-ends.
Oscillators
AT-cut wafers with near-zero temperature coefficient at 25°C and Q > 10⁶ for high-stability clock and reference oscillators.
BAW Resonators
Bulk acoustic wave resonators on AT-cut in fundamental and overtone modes, 1 MHz–2.5 GHz for timing and filtering.
Sensors
Piezoelectric quartz microbalances and pressure sensors exploiting the stable electromechanical coupling of AT/ST cuts.
Piezo-MEMS
Thin quartz plates for piezoelectric MEMS resonators, gyroscopes, and energy-harvesting devices with low loss.
Timing References
Precision frequency references for telecom, GNSS, and data centers requiring low aging and excellent long-term stability.
Metrology & Quality Control
Every GINECHIP quartz wafer is individually inspected. A full metrology report—covering cut orientation, roughness, geometry, resonance, and purity data—accompanies each shipment.
Request a Quartz Wafer Quote
Send your custom specifications—cut orientation, diameter, thickness, and surface finish—and our team will get back with a fast quote tailored to your oscillator, SAW/BAW, and timing applications.