Vacuum feedthrough KF40

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Overview
The KF40 BNC feedthrough is an electrical vacuum feedthrough designed to introduce BNC coaxial signals through an ISO-KF40 flange into vacuum chambers while maintaining high vacuum compatibility and signal integrity. It is suitable for research, semiconductor processing, vacuum electronics and analytical instrumentation where stable RF and low-frequency signal transmission is required.

Main structure and configuration options

• Number of conductors / contacts
  • Single-channel (1–2 contacts) — for single coaxial signal or standard signal lines
  • Multiple channels (e.g. 4 × BNC) — multiple independent BNC interfaces on a single KF40 flange for integrated multi-signal systems
• Impedance matching method
  • 50 Ω impedance-matched type — for RF and high-frequency signals to minimize reflections
  • Non-impedance-matching type — for DC or low-frequency control and power lines
• Shielding and grounding
  • Grounded shield type — coaxial shield electrically connected to the flange to suppress EMI
  • Floating shield type — shield isolated from the flange for systems sensitive to ground potential differences
• Interface position form
  • Single-side outlet (air-side BNC) — air side with standard BNC; vacuum side wired with pins or solder terminals
  • Dual outlet (BNC on both sides) — BNC interfaces on both air and vacuum sides for modular 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 method: metal-ceramic vacuum brazing

Applications

• High and ultra-high vacuum systems
• RF and signal feed modules
• Semiconductor processing equipment
• Analytical instruments (mass spectrometers, electron microscopes)
• Vacuum research and experimental setups

Technical specifications

• Rated voltage: ≤ 500 V DC
• Rated current: ≈ 3 A per single contact
• Leakage rate: ≤ 1 × 10⁻⁹ mbar·L/s
• Maximum baking temperature: 150 °C (design-dependent)
• Flange standard: ISO-KF40
• Flange/body material: 304 / 304L stainless steel
• Insulator material: high-purity alumina ceramic
• Sealing method: metal-ceramic vacuum brazing