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Lam Research 778-900046-343 Current Probe
Lam Research 778-900046-343
Product Overview
The Lam Research 778-900046-343 is a high-frequency Radio Frequency (RF) Voltage/Current Probe (VI Probe) exclusively designed for Lam Research semiconductor manufacturing equipment, serving as a critical sensor in the closed-loop control system of advanced plasma processes. Typically installed on the RF transmission line between the RF Match network and the chamber electrode (generally Electrostatic Chuck / ESC or upper electrode), this component undertakes core signal monitoring and feedback functions.
It adopts ultra-high precision and high-frequency response performance to collect real-time key RF parameters, including voltage, current, phase angle, forward power and reflected power. The acquired analog signals are converted into digital or analog signals recognizable by the system and fed back to the main controller. This real-time monitoring enables accurate calculation of in-chamber power coupling efficiency, impedance matching status and plasma density, which is essential for the precise control of etching rate, process uniformity and selectivity ratio.
Product Specifications
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Parameter Name
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Parameter Value
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Product Model
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778-900046-343
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Manufacturer
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Lam Research
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Product Type
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RF Voltage/Current Probe (VI Probe)
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Frequency Range
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Typically applied in industrial frequency bands: 2 MHz, 13.56 MHz, 27 MHz, 60 MHz
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Measurable Parameters
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Voltage, Current, Phase Angle, Forward Power, Reflected Power, Impedance
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Measurement Accuracy
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Voltage/Current Amplitude Accuracy: ±1% of reading; Phase Accuracy: ±1°
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Power Supply Voltage
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Supplied by system interface (Typical value: +24V / +15V)
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Interface Type
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RF coaxial interface (Type-N or 7/16 DIN); Signal output interface: D-Sub or circular aviation connector
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Operating Temperature
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15°C to 65°C (installed inside equipment modules)
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Housing Material
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High-permeability magnetic alloy and nickel-plated aluminum alloy
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Protection Grade
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Suitable for non-high-vacuum and non-liquid internal equipment environments
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Structure and Composition
The Lam Research 778-900046-343 features an integrated design of high-frequency analog circuits and precision mechanical processing. Its housing is made of high-permeability magnetic metal materials to provide effective EMI/RFI shielding, preventing strong RF fields from interfering with internal sensitive measurement circuits and surrounding electronic devices. The component is connected in series to the RF transmission line via standard high-power RF coaxial connectors, ensuring low signal transmission loss and excellent VSWR (Voltage Standing Wave Ratio) tolerance.
The internal core structure consists of a high-bandwidth directional coupler and a signal processing board. The directional coupler extracts weak signals proportional to RF voltage and current from the main RF transmission path with ultra-low insertion loss. These signals are then transmitted to the precision resistor voltage divider network, current transformer and high-speed analog multiplier on the signal processing board for conditioning and detection.
The processed signals are either converted via Analog-to-Digital Conversion (ADC) or amplified linearly, then transmitted to the equipment I/O interface board or dedicated RF controller module through the rear aviation connector. The collaborative operation of all internal components quantifies the “black-box” high-power RF energy transmission process into clear, measurable electrical parameters, supporting real-time adjustment of the control system.
Key Features and Advantages
High Precision and Broadband Performance
Covering multiple ISM bands widely used in the semiconductor industry (2 MHz, 13.56 MHz, 27 MHz, 60 MHz), the probe delivers outstanding measurement accuracy with ±1% amplitude error and ±1° phase error, enabling precise RF power measurement across different frequencies. This capability is critical for accurate plasma impedance calculation and rapid tuning of matching networks, serving as the foundation for high etching selectivity and minimal process deviation.
Fast Response and Real-Time Monitoring
Equipped with ultra-fast signal response capability, the probe captures transient RF power changes at the millisecond level. Combined with its high-sensitivity directional coupler, it accurately distinguishes forward power and reflected power. The system can instantly detect impedance mismatch caused by chamber polymer deposition or edge ring wear, triggering early warnings or automatic compensation to protect the RF generator from damage by excessive reflected power.
Plug-and-Play and Integrated Data Diagnosis
Built with an EEPROM storage chip, the Lam Research 778-900046-343 stores calibrated data and parameter configurations locally. When installed in a new chamber or paired with a new matching network, the system automatically identifies and loads calibration parameters, simplifying installation and verification procedures while ensuring full traceability of measurement data. The abundant data output provides high-quality data sources for FDC (Fault Detection and Classification) systems, enabling predictive maintenance for semiconductor fabs.
Application Fields
The Lam Research 778-900046-343 is mainly applied in plasma etching and Plasma-Enhanced Chemical Vapor Deposition (PECVD) equipment for front-end semiconductor manufacturing. It is compatible with 200mm (8-inch) and 300mm (12-inch) wafer production lines, and is indispensable for the manufacturing of Logic, DRAM and 3D NAND Flash chips.
In rigorous dielectric etching (Oxide Etch, SiN Etch) and metal etching (Al, TiN Etch) processes, the probe continuously monitors RF transmission status to ensure anisotropic etching of high-aspect-ratio (HAR) structures. Additionally, for pulsed RF processes such as advanced Atomic Layer Deposition (ALD) and Atomic Layer Etching (ALE), its high-speed capture function accurately measures power characteristics in each RF pulse cycle, supporting atomic-level precision control of thin-film growth and material removal.
For equipment and process engineers, this probe is a core tool for chamber matching and hardware health diagnosis (e.g., detecting electrical performance drift caused by quartz window or focus ring wear). The accurate data it provides is the key to optimizing process windows and realizing cross-equipment process consistency (Golden Chamber Matching).
Related Products
- Lam Research 778-900046-342: The previous version of this model with identical hardware appearance. Its internal firmware and calibration parameters may not be compatible with the latest process control systems, so hardware and firmware versions must be strictly distinguished during procurement.
- Lam Research 778-900046-344: A high-power version of the series, designed for high-density plasma (HDP) chambers and equipment requiring high-power RF sources, with enhanced coupler power processing capacity.
- Lam Research 778-900048-xxx: A member of the VI probe series with differentiated interface types and frequency response ranges, mainly used to match special RF matching networks (e.g., remote matching sources).
- Lam Research 771-000063-xxx: RF Match network, the upstream matching device of the VI probe. The impedance data provided by the probe guides the internal capacitance tuning of the matching network.
- Lam Research 851-010522-xxx: RF Cable Assembly, connecting the matching network, VI probe and chamber electrode. Its standard 50Ω characteristic impedance directly guarantees the measurement accuracy of the VI probe.
Installation and Maintenance
Pre-Installation Preparation
Before installing the Lam Research 778-900046-343, ensure the equipment is in a safe state with complete power cut-off, pressure relief and cooling. Operators must wear anti-static wristbands. Use a dedicated torque wrench to fasten RF coaxial connectors in accordance with the factory standard torque (12-15 lb-in), and apply an appropriate amount of conductive grease (molybdenum-based grease) on the connector outer ring.
When connecting signal control cables, confirm that the plug model and pin definition match the host system to avoid circuit board burnout caused by incorrect insertion. After installation, conduct a VSWR test on the RF path to eliminate abnormal reflected power.
Maintenance Recommendations
The probe has no movable parts, but its calibration accuracy may drift slightly over time. It is recommended to perform rapid calibration verification with a standard 50Ω dummy load during each Preventive Maintenance (PM) or chamber consumable replacement. During equipment Dry Clean processes, dramatic changes in plasma load may occur, so real-time monitoring of the reflected power waveform fed back by the probe is required.
If abnormal measurement data is detected, first check for loose or oxidized RF connectors and intact coaxial cables. On-site internal adjustment of the probe is not recommended unless professional high-frequency calibration equipment is available.
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