649-007321-004
CAPACITOR, HIGH VOLTAGE

High-voltage capacitor (OEM P/N 649-007321-004), RF and DC energy-storage component for LAM plasma processing systems

ESCT P/N ES2022-124, OEM-new high-voltage capacitor for LAM etch and deposition tooling

The High-Voltage Capacitor identified by LAM OEM part number 649-007321-004, supplied by ESCT Fab Support under part number ES2022-124, is a discrete passive energy-storage and reactive-power component used within the high-voltage electrical subsystems of LAM semiconductor process equipment. In a plasma etch or deposition platform, a capacitor of this class is rated to withstand kilovolt-level potentials and to handle the substantial RF currents and transient surges that characterise the power-delivery, matching and bias circuitry feeding the process chamber. Its role is to store charge, smooth or block voltage, tune reactive impedance, or filter unwanted frequency content, depending on exactly where it is installed in the tool.

High-voltage capacitors of this type are typically found inside RF match networks, generator output stages, electrostatic chuck (ESC) high-voltage clamping supplies, DC bias supplies, and the snubber or filter banks that protect switching electronics. Wherever it sits, the component must hold its rated capacitance and dielectric strength under continuous thermal and electrical stress, because the surrounding circuitry has been tuned around its specific value and loss characteristics. A drift in capacitance or a breakdown in its dielectric directly disturbs the electrical balance of the subsystem it serves.

Because plasma processing depends on stable, repeatable delivery of RF and DC energy to the wafer, the integrity of every high-voltage passive in the power chain has a measurable effect on process outcome. A capacitor that has degraded can shift the operating point of a match network, introduce reflected power, or compromise the holding force of an electrostatic chuck. For this reason the High-Voltage Capacitor is treated as a critical spare in LAM tool maintenance, and sourcing a verified OEM-new replacement restores the tool to its qualified electrical baseline.

Functional role of the high-voltage capacitor in LAM plasma processing platforms

Within LAM etch and deposition systems, the high-voltage capacitor performs several distinct electrical functions depending on its placement in the RF and DC architecture. Its core purpose is to manage the storage, transfer and conditioning of electrical energy at potentials and frequencies that would damage ordinary low-voltage components.

• Storing and releasing charge to smooth high-voltage DC rails feeding bias or electrostatic-chuck clamping supplies.
• Providing tuned reactance within RF impedance-matching networks so that generator power is transferred efficiently to the plasma load.
• Blocking DC offsets while allowing RF signals to pass, isolating supply rails from the RF path.
• Filtering ripple, noise and unwanted harmonic content from high-voltage supply and feedback lines.
• Absorbing transient surges and switching spikes as a snubber element protecting downstream semiconductors and contacts.
• Maintaining a stable, defined electrical reference point against which the surrounding control loops are tuned.

Electrical and signal performance

Dielectric strength and capacitance stability

The defining quality of a high-voltage capacitor is its ability to hold a precise capacitance value while withstanding voltages well above the nominal operating level. The dielectric, commonly a high-grade ceramic, film or vacuum-gap construction in components of this class, must resist breakdown across its full rated working voltage with adequate margin for transient peaks. Stability of the capacitance value over temperature and applied voltage is equally important, because the match networks and bias circuits around it assume a fixed reactance.

• High rated working voltage with margin for RF peaks and switching transients.
• Tight capacitance tolerance to preserve the tuned reactance of match and filter circuits.
• Low temperature coefficient to minimise drift as the tool warms to operating conditions.
• Heavy-duty dielectric construction resistant to partial discharge and corona onset.

RF current handling and loss

In RF service the capacitor must carry substantial circulating current with minimal dissipation. A low equivalent series resistance (ESR) and a low dissipation factor keep self-heating within safe limits, while the capacitor’s self-resonant frequency must sit well clear of the operating band so the part behaves capacitively rather than inductively. Excessive loss not only wastes RF power but accelerates internal heating, which in turn degrades the dielectric over time.

• Low ESR and dissipation factor to limit self-heating under continuous RF current.
• High RF current rating matched to the generator power level it serves.
• Self-resonant frequency positioned away from the working band for predictable behaviour.
• Stable terminations and low-inductance leads to preserve high-frequency response.

Impact on tool performance and yield

Because the high-voltage capacitor is woven into the electrical subsystem that delivers energy to the plasma, any deviation in its behaviour propagates into the process. A degraded or failed unit can take a tool offline outright or, more insidiously, allow it to keep running while drifting out of specification.

• Shifted match-network tuning, leading to elevated reflected power and unstable plasma ignition.
• Reduced or unstable electrostatic-chuck clamping force, risking wafer movement, backside-cooling loss and temperature non-uniformity.
• Increased ripple or noise on bias supplies, degrading etch profile or deposition uniformity.
• Intermittent faults and arcing that trip interlocks and cause unscheduled downtime.
• Wafer scrap and reduced yield where out-of-spec processing goes undetected between qualification checks.

Common failure modes

Dielectric breakdown and arcing

The most catastrophic failure is breakdown of the dielectric under high voltage, often preceded by partial discharge or corona activity at points of field concentration. Once a conductive path forms, the capacitor can short, arc internally, or rupture, taking out fuses and stressing the surrounding power electronics. Voltage transients beyond the rated margin and gradual ageing of the dielectric both contribute to this mode.

Capacitance drift and dielectric ageing

Long-term exposure to heat, voltage and RF stress can cause the capacitance value to drift or the loss to rise as the dielectric ages. This is a quieter failure than a short circuit: the tool keeps operating, but its match networks and bias loops slowly fall out of their tuned condition, eroding process repeatability before any hard fault appears.

Thermal overstress and termination failure

High circulating RF current combined with elevated ESR generates internal heat that, if not dissipated, accelerates dielectric degradation and can crack ceramic bodies or fatigue solder and mechanical terminations. Loose or oxidised connections raise contact resistance, create localised hot spots and may produce intermittent open-circuit behaviour that is difficult to diagnose.

Installation and replacement guidance

Replacement of a high-voltage capacitor must be carried out by a qualified technician following LAM service procedures, with full attention to the stored-energy hazards inherent in high-voltage circuits. The following sequence outlines good practice.

• Place the tool in a safe maintenance state, then lock out and tag out all power sources, including RF generators and high-voltage supplies.
• Allow the appropriate dwell time and verify with a meter that the capacitor and its circuit are fully discharged before contact, using an approved discharge tool where required.
• Document and photograph existing wiring, orientation and mounting so the replacement is installed identically.
• Remove the failed capacitor, noting any mounting hardware, standoffs or thermal interface arrangements.
• Install ES2022-124 in the same orientation, with clean, tight, low-resistance terminations and correct creepage and clearance distances.
• Inspect adjacent components for collateral damage from any prior arcing, and confirm fuses or protective devices are sound.
• Restore power under controlled conditions and re-qualify the subsystem, checking match tuning, reflected power or clamp voltage as applicable, before returning the tool to production.

Spare parts strategy for LAM high-voltage components

High-voltage passives are low-cost relative to the downtime they cause, which makes them ideal candidates for proactive stocking. ESCT Fab Support helps fabs keep these critical spares on the shelf without the constraints of single-source procurement.

• Supplied as an OEM-new component verified to the form, fit and function of LAM P/N 649-007321-004.
• Catalogued under a single ESCT reference, ES2022-124, for straightforward reordering.
• A defined lead time of approximately four weeks to support planned maintenance scheduling.
• An alternative to sole-source dependence, improving supply resilience and commercial use.
• Backed by knowledgeable support for cross-checking application and electrical fit.

Frequently asked questions

What does this high-voltage capacitor do in a LAM tool?

It stores and conditions electrical energy in the high-voltage RF and DC subsystems of LAM plasma equipment, functions such as smoothing supply rails, tuning RF match-network reactance, blocking DC while passing RF, filtering noise, or absorbing switching transients, depending on its position in the circuit.

Is this an original OEM part?

No. ES2022-124 is supplied as an OEM-new, OEM-compatible component that is verified to the form, fit and function of LAM P/N 649-007321-004. It is not an original LAM-branded part and is offered as a compatible replacement.

What is the lead time?

The typical lead time is approximately four weeks. We recommend factoring this into your preventive-maintenance planning and holding a spare on the shelf for critical high-voltage positions.

How do I know when the capacitor needs replacing?

Symptoms include rising reflected power or unstable match tuning, intermittent arcing or interlock trips, unstable electrostatic-chuck clamping, increased ripple on bias supplies, or visible signs of overheating or cracking. Measured capacitance drift or elevated loss during scheduled checks is also a strong indicator.

What safety precautions apply during replacement?

High-voltage capacitors can retain a lethal charge after power is removed. Always lock out and tag out the tool, allow the specified discharge time, and confirm with a meter that the component is fully discharged before handling. Only qualified personnel should perform the work, following LAM service documentation.

Will it match the electrical characteristics of the original?

Yes. The component is verified to match the capacitance, voltage rating and physical interface of the original part so the surrounding circuitry remains correctly tuned. If you have any uncertainty about your specific application, our team can help confirm fit before you order.

Summary

The High-Voltage Capacitor (LAM P/N 649-007321-004, ESCT P/N ES2022-124) is a critical passive component in the high-voltage RF and DC subsystems of LAM plasma etch and deposition tools, where it stores charge, tunes reactance, blocks DC, filters noise and absorbs transients. Its dielectric strength, capacitance stability and low-loss RF performance directly influence match-network tuning, electrostatic-chuck clamping and overall process repeatability, so degradation translates quickly into reflected power, instability and yield loss. Supplied as an OEM-new, verified replacement with an approximately four-week lead time, ES2022-124 lets fabs maintain a reliable, resilient spare for this high-value, low-cost position.

Disclaimer: This part is supplied by ESCT Fab Support as a new, OEM-compatible second-source component, verified to the form, fit and function of Lam Research part number 649-007321-004. It is not an original OEM part and is not sold as one. It is not manufactured by, endorsed by, or affiliated with Lam Research, and all manufacturer names and part numbers are quoted for identification and compatibility purposes only.