JJK 6MHz-12MM-Dual-Anchor Silver Electrode Crystal Sensor
Part No：SC6AD12
The SC6AD12 is a 6MHz quartz monitor crystal specifically designed for high-precision, real-time monitoring applications. Its core feature is the **high-purity silver (Pure Silver)** electrode structure, which leverages silver's excellent electrical conductivity to achieve an extremely low resonant resistance (≤15Ω), ensuring instantaneous oscillation start-up and ultra-high signal capture sensitivity. Engineered with a high-quality quartz substrate and AT-CUT processing for the precise 12.42mm specification, combined with a mature dual-anchor (2-Anchor) electrode pattern, it delivers outstanding measurement linearity and frequency stability at the industry-standard 6MHz frequency. It is the ideal choice for precision optical thin films, semiconductor evaporation, and various 12mm probe head systems where ultimate measurement accuracy and high oscillation start-up reliability are paramount.
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SC6AD12 6MHz Pure Silver Dual-Anchor Sensor: Benchmark for High-Precision Measurement and Superior Oscillation Performance
In optical coating and fine metallization processes, the 6MHz crystal sensor offers higher frequency resolution, enabling more sensitive detection of minute mass changes. The SC6AD12 fully leverages the advantage of its precise 12.42mm diameter, combined with a 6.000MHz nominal fundamental frequency, specifically designed for refined deposition rate control. The scientifically preset center frequency of 5.988MHz compensates for the loading effect of the thick silver electrode layer, ensuring the crystal operates at its optimal frequency band immediately upon installation. The dual-anchor (2-Anchor) electrode design not only optimizes the physical strength of the 12mm crystal but also significantly enhances the electrical connection stability at the probe contact points, fundamentally reducing signal jumps caused by poor contact.
Pure Silver Electrode Technology: Unleashing Ultra-Low Impedance Advantages for Enhanced Weak Signal Response
The SC6AD12 features pure silver electrodes fabricated using a high-vacuum sputtering process. Silver, being the metal with the highest electrical conductivity in nature, endows the crystal with an extremely low initial resonant resistance (R1 ≤15Ω), allowing the crystal to maintain a high Q-factor even in its thinner initial stages. This makes oscillation start-up exceptionally easy and enhances interference immunity. The dual-anchor electrode, through two symmetrical 'anchor' points, provides stable support while creating redundant current paths. This ensures stable ohmic contact even under high temperatures (up to 75°C) or complex evaporation environments, effectively resolving signal noise fluctuations commonly found in single-anchor or anchorless designs.
Precisely Compatible with 12mm Monitoring Systems, Ensuring Continuous Production Yield through Thermo-Mechanical Stability
The SC6AD12 strictly adheres to the 12.42mm (±0.03mm) dimensional standard, making it a perfect replacement for OEM consumables in mainstream coating machines such as Optorun and Shincron. The AT-CUT process, meticulously optimized for frequency-temperature compensation, ensures minimal frequency drift within the typical coating temperature range of 25°C to 75°C. The pure silver electrode's unique surface energy enhances the adhesion of deposited materials. Coupled with the high resolution provided by the 6MHz frequency, it demonstrates superior linearity compared to conventional alloy sensors in monitoring the thickness of precision filters and multi-layer anti-reflective coatings, effectively improving product consistency.
SC6AD12 Technical Specifications
| Part No | SC6AD12 |
| Nominal Frequency | 6.000MHz |
| Center Frequency | 5.988MHz |
| Frequency Tolerance | ±8KHz@25°C |
| Wafer Diameter | 12.42mm ± 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 .
The pure silver electrode offers higher electrical conductivity and a lower chemical barrier. In 6MHz high-frequency monitoring, this translates to lower resonant resistance (≤15Ω) and higher oscillation start-up sensitivity. For processes with extremely demanding initial deposition signal requirements (such as ultra-thin films), the pure silver electrode provides more timely frequency feedback, reducing the risk of oscillation start-up failure.
This is a pre-compensation design for the mass loading of the pure silver electrode. The thickness of the silver layer slightly shifts the resonant frequency of the quartz crystal downward. The 5.988MHz center frequency ensures that when the crystal is installed in the probe and begins operation in a vacuum environment, its actual operating frequency is closest to the 6MHz linear optimum point, thereby reserving maximum linear range for subsequent deposition.
12.42mm (±0.03mm) is the standard specification for high-precision Japanese and domestic sensors. Precise tolerance control ensures the crystal sensor fits securely in the holder without being loose (to prevent signal drift) or overly tight (to prevent frequency jumping). The SC6AD12 is mechanically optimized specifically for the retention force of such probes.
Because pure silver readily reacts with sulfides in the air, the SC6AD12 comes in special anti-tarnish packaging. It is recommended to store it in a dry environment with relative humidity between 30-50%, and the storage period should not exceed 6 months. Once opened, it should be used as soon as possible, and bare hands should be avoided touching the electrode surface to prevent contamination by sweat that could affect performance.
Yes. The dual-anchor not only increases the redundancy of signal contact but also distributes the localized pressure exerted by the probe spring clip on the crystal. During repeated cycles or long-term deposition, this structure effectively alleviates stress concentration within the quartz substrate, reducing the likelihood of crystal fracture or premature signal loss due to increased contact resistance.
The SC6AD12 is widely used in precision optical coatings (such as multi-layer narrow-band filters), semiconductor metallization processes, and OLED evaporation. Its 6MHz high-resolution characteristic gives it a distinct advantage over 5MHz crystals when monitoring thinner films or layers requiring extremely precise thickness control.