Vacuum feedthrough

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Overview The KF40 BNC vacuum electrical feedthrough is a compact electrical through‑part designed to transfer BNC coaxial signals reliably from atmosphere into a vacuum chamber. It is suitable for high and ultra‑high vacuum systems where signal integrity, low leakage and vacuum compatibility are required. Typical uses include research laboratories, semiconductor processing, vacuum electronics and analytical instruments.

Main structure and configuration options

• Number of conductors / contacts
  • Single‑channel (1–2 contacts): for single coaxial or control signal lines
  • Multi‑channel (e.g., 4×BNC): integrates multiple independent BNC interfaces on one KF40 flange for compact multi‑signal routing
• Impedance matching
  • 50 Ω impedance‑matched type: for RF and high‑frequency signals to minimise reflections
  • Non‑matched type: for DC or low‑frequency control and power lines
• Shielding and grounding
  • Grounded shield: coaxial shield bonded to the flange to suppress EMI
  • Floating shield: shield isolated from flange for circuits sensitive to grounding or different potentials
• Interface arrangement
  • Single‑side outlet (air‑side BNC): standard BNC on atmosphere side, pins or solder terminals on vacuum side for internal wiring
  • Dual outlet (BNC both sides): BNC on both air and vacuum sides for modular assemblies and quick connections

Technical Parameters

• Rated voltage: ≤ 500 V DC
• Rated current: ~3 A per contact
• Leakage rate: ≤ 1 × 10⁻⁹ mbar·L/s
• Maximum baking temperature: 150 °C (design dependent)
• Flange standard: ISO‑KF40

Materials and techniques

• Flange/body: 304 / 304L stainless steel
• Insulator: high‑purity alumina ceramic
• Sealing: metal‑ceramic vacuum brazing

Application

• High and ultra‑high vacuum systems
• RF signal feedthroughs and instrumentation
• Semiconductor process equipment
• Analytical instruments (mass spectrometers, electron microscopes)
• Vacuum research and experimental setups

Characteristics / technical specifications

• Rated voltage: ≤ 500 V DC
• Rated current: ~3 A per contact
• Leakage rate: ≤ 1 × 10⁻⁹ mbar·L/s
• Maximum baking temperature: 150 °C (depends on design)
• Flange standard: ISO‑KF40
• Materials: 304 / 304L stainless steel; high‑purity alumina insulator
• Sealing: metal‑ceramic vacuum brazing
• Impedance options: 50 Ω or non‑matched
• Shielding options: grounded shield or floating shield
• Configurations: single‑channel (1–2 contacts) or multi‑channel (e.g., 4×BNC)