JJK 5MHz-12MM-Dual-Anchor Silver Electrode Crystal Sensor
Part No：SC5AD12
The SC5AD12 is a 5MHz pure silver electrode monitoring crystal sensor specifically designed for heavy-load, long-cycle deposition tasks. Its core advantage lies in combining the extremely high mass-load tolerance of the 5MHz quartz substrate with the ultra-sensitive electrical characteristics of **high-purity silver (Pure Silver)** electrodes. For the precise 12.42mm size, this model utilizes a high-Q AT-cut process combined with a dual-anchor (2-Anchor) electrode design, maintaining an extremely low resonant resistance of ≤15Ω even at the lower fundamental frequency of 5.000MHz. It is a high-performance benchmark for thick-film optical deposition, fluoride coatings, and processes requiring exceptionally long monitoring lifespans, significantly extending the service life of each individual crystal while ensuring high precision.
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SC5AD12 5MHz Pure Silver Dual-Anchor Sensor: Tailor-Made for Thick-Film Deposition and Heavy-Load Processes
In the precision coating industry, 5MHz crystal sensors, with their thicker quartz substrates compared to 6MHz variants, offer superior mechanical stress resistance and higher mass-loading capacity. The SC5AD12 leverages this physical advantage, combined with its precise 12.42mm diameter, specifically for PVD processes requiring extended continuous monitoring. Its 4.96MHz center frequency design reserves an exceptionally wide linear operating range for subsequent heavy film deposition. The dual-anchor electrode structure further optimizes the stress distribution of the 12mm crystal within the probe, effectively addressing common signal noise and frequency jump issues encountered during later stages of thick-film deposition.
Pure Silver Electrode and Low-Impedance Technology: Maintaining Ultimate Sensitivity in Long-Term Monitoring
The SC5AD12 abandons conventional alloy electrodes in favor of a high-vacuum evaporated pure silver process, fully leveraging silver's superior conductivity. This provides the crystal with an ultra-low resonant resistance of ≤15Ω from the initial stage, ensuring stable oscillation and signal purity. For 5MHz crystals, which demand extremely high surface quality, the pure silver electrode delivers a stronger energy trapping effect, concentrating vibration at the electrode center. The dual-anchor (2-Anchor) design, through two symmetrical fixing points, provides redundant signal transmission paths, maintaining reliable electrical connection even when probe spring contacts fatigue due to prolonged high-temperature coating operations.
Precisely Compatible with 12mm Systems, Enhancing Thick-Film Process Yield through Superior Linearity
The SC5AD12 strictly adheres to the 12.42mm (±0.03mm) industrial tolerance, precisely fitting Japanese and domestic high-precision 12mm probes from Shincron, Optorun, and others. Its AT-CUT angle is rigorously optimized for thermal drift compensation, delivering excellent frequency-temperature stability within the 25°C to 75°C range. The combination of pure silver electrodes and 5MHz crystals significantly enhances adhesion energy between the deposited film and the quartz surface. When depositing high-stress materials such as fluorides and sulfides, it effectively suppresses film peeling, reducing unplanned downtime and saving costly material and time resources.
SC5AD12 Technical Specifications
| Part No | SC5AD12 |
| Nominal Frequency | 5.000MHz |
| Center Frequency | 4.96MHz |
| Frequency Tolerance | ±7KHz@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 .
Pure silver electrodes offer unparalleled electrical conductivity, maintaining the resonant resistance of the 5MHz crystal at an extremely low level (≤15Ω). During heavy-load, thick-film deposition, lower resistance translates to stronger drive capability and a higher signal-to-noise ratio. This allows the crystal to maintain stable oscillation even under extremely heavy loads, resulting in a significantly longer service life compared to alloy electrodes.
The 5MHz crystal sensor features a thicker substrate with greater physical strength. Under the same film thickness deposition, the 5MHz crystal exhibits a smaller percentage frequency shift, meaning it has a greater 'mass tolerance.' For optical thick films or processes requiring continuous operation for several hours, the SC5AD12 is the preferred choice for preventing premature crystal failure and enhancing production continuity.
This is a pre-compensation design for the thick silver electrode and heavy-load processes. The silver electrode itself has a certain mass that shifts the 5.000MHz nominal frequency downward. Setting the center frequency at 4.96MHz ensures that the crystal operates in the most stable Q-factor resonant region immediately after installation, while reserving additional linear frequency space for subsequent film growth.
The dual-anchor electrode provides two symmetrical contact areas, increasing installation flexibility. Compared to full-cover electrodes, the dual-anchor points better guide stress release and reduce physical deformation of the crystal under clamping pressure. During installation, simply ensure the probe spring contact presses against either anchor area to achieve extremely low contact resistance and stable signal feedback.
Due to its thickness advantage, the 5MHz substrate possesses natural resistance to stress. Combined with the excellent ductility and surface adhesion of the pure silver electrode, the SC5AD12 effectively buffers mechanical stress generated by the film layer, preventing the common 'mode hopping' phenomenon during the middle and later stages of deposition. It is an ideal choice for high-stress thin-film monitoring.
Pure silver readily reacts with sulfur and moisture in the environment, which is why we use anti-sulfur vacuum packaging. Storage in a dry cabinet (humidity 30-50%) is recommended. Since 5MHz crystals are extremely sensitive to surface contamination, clean tweezers must be used after opening, and finger contact with the electrode surface is strictly prohibited to prevent skin oils from increasing R1 resistance or causing oscillation start-up difficulties.