JJK 5MHz-14MM-Dual-Anchor Silver Electrode Crystal Sensor
Part No：SC5AD14
The SC5AD14 is a 5MHz pure silver electrode crystal sensor designed specifically for heavy-duty industrial applications and thick-film deposition monitoring. Its standard 13.97mm diameter perfectly fits Inficon, Leybold, and other major 14mm probe systems worldwide. This product combines the exceptional physical strength of the 5MHz quartz substrate with the superior conductivity of **high-purity silver (Pure Silver)** electrodes, achieving an ultra-low starting resistance of ≤15Ω. Tailored for thick-film processes, the SC5AD14 provides broader frequency tuning range and enhanced stress tolerance, making it a critical consumable for ensuring process continuity and measurement linearity in large optical coatings, high-stress metallization, and long-cycle vacuum deposition tasks.
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SC5AD14 14mm Industrial Heavy-Duty Sensor: A Highly Reliable Choice for Thick-Film Monitoring
In large-scale industrial coating equipment, the 14mm specification is the most widely adopted standard. The SC5AD14, designed with a 5.000MHz fundamental frequency, features a thicker quartz substrate compared to 6MHz crystals, enabling it to withstand greater film stress and higher mass loads. The precision 13.97mm substrate, combined with AT-CUT thermal compensation processing, ensures exceptionally stable frequency output even under the high temperatures generated during high-power evaporation. The scientifically preselected 4.96MHz center frequency reserves ample 'lower-limit headroom' for thick-film deposition, significantly extending the effective monitoring time of each crystal before reaching its failure point.
Pure Silver Electrode with Dual-Anchor Structure: Injecting Ultimate Sensitivity into Low-Frequency Large-Format Crystals
The SC5AD14 features electrodes formed by high-purity silver vacuum sputtering. Leveraging silver's excellent electrical properties, it excites an exceptionally high Q-factor even at the lower vibration frequency of 5MHz. The ≤15Ω resonant resistance ensures rapid oscillation start-up and robust signal integrity. The unique symmetrical 'dual-anchor (2-Anchor)' electrode design provides more balanced mechanical support across the larger 14mm diameter, effectively mitigating interference from sensor spring contacts on the crystal's central vibration zone. This structure not only enhances contact reliability but also creates dual-signal path redundancy, significantly reducing the risk of frequency jumping and noise caused by contact resistance fluctuations in high-volume production.
Deep Compatibility with Global Mainstream Systems, Enhancing Yield in High-Stress Thin-Film Deposition
The SC5AD14 strictly adheres to the international tolerance of 13.97mm (±0.03mm), compatible with various monitoring systems including Inficon, Balzers, and major domestic 14mm sensors. Its AT-CUT angle is specially optimized to effectively compensate for thermal frequency drift within the 25°C to 75°C temperature range. For processes prone to mechanical stress, such as depositing fluorides, sulfides, or thick metal layers, the 5MHz substrate demonstrates superior crack resistance. Combined with the excellent film adhesion of pure silver electrodes, the SC5AD14 maintains precise rate feedback under extreme load conditions, making it an ideal solution for processes targeting 'long life and high precision.'
SC5AD14 Technical Specifications
| Part No | SC5AD14 |
| Nominal Frequency | 5.000MHz |
| Center Frequency | 4.96MHz |
| Frequency Tolerance | ±7KHz@25°C |
| Wafer Diameter | 13.97mm ± 0.03mm |
| Resonance Resistance | ≤15Ω |
| Crystal Cutting | AT-CUT |
| Electrode Material | Silver |
| Operating Temperature | 25°C ~ 75°C |
| Electrode Appearance | Dual-Anchor Electrode 2 anchors |
| Storage Temperature | -20°C ~ +85°C |
| Storage Humidity | Relative Humidity 30~50% |
| Storage Life | 6 months |
applications of the quartz monitor crystal
Find answers to the most frequently asked questions .
13.97mm (standard 14mm) is an international standard. The SC5AD14 is perfectly compatible with most 14mm sensors from brands such as Inficon, Leybold, Balzers, and Ulvac, serving as a standard consumable for industrial-grade evaporation equipment.
This is a 'frequency shift reserve' specifically designed for thick-film and heavy-load processes. The pure silver electrode itself is relatively heavy, causing the initial frequency to drop; setting the center frequency near 4.96MHz allows the crystal to operate in an optimal resonant state after installation, while reserving extended linear lifespan headroom for subsequent heavy film deposition, preventing the crystal from reaching its failure limit prematurely.
5MHz crystals have higher vibration energy. The ultra-low impedance (≤15Ω) of pure silver electrodes reduces internal loss (damping), resulting in a higher signal-to-noise ratio. In the mid-to-late coating stages, as film thickness increases and crystal impedance rises, the pure silver electrode, with its extremely low starting resistance, can sustain oscillation longer than alloy electrodes before reaching the oscillation threshold, thus extending service life.
The 14mm crystal has a larger force-bearing area. The dual-anchor design distributes the mechanical pressure from the probe spring contacts, preventing stress concentration at the quartz center that could lead to fracture. Simultaneously, it provides two symmetrical conductive paths, ensuring stable electrical signal transmission even when the probe experiences slight deformation or contamination from long-term use.
Due to silver's chemical properties, it does tarnish when exposed to sulfur-containing air. Therefore, we use anti-sulfur vacuum packaging and recommend storage in a dry environment with relative humidity of 30-50%. As long as used within the 6-month storage period, slight surface discoloration typically does not affect its excellent oscillation sensitivity and measurement accuracy.
The 5MHz crystal corresponds to a thicker quartz substrate with greater mechanical stress tolerance. Additionally, the 5MHz frequency offers moderate sensitivity to mass changes, which means that during thick-film deposition (such as optical infrared layers or heavy metal layers), it does not fail as quickly as 6MHz crystals due to rapid frequency decline, offering superior stability.