The Alpha Technology SMA Coaxial Vacuum Feedthrough preserves a controlled 50 Ω impedance across the vacuum boundary, so RF signals and fast pulses pass into your chamber without reflections. With transmission up to 1 GHz and a true ceramic-to-metal seal, it is the standard choice for plasma diagnostics, RF probes and high-frequency instrumentation in vacuum.
SMA Coaxial Vacuum Feedthrough — Key Specifications
| Impedance | 50 Ω |
|---|---|
| Transmission | Up to 1 GHz |
| Voltage Rating | 700 V DC |
| Max Current | 3 A |
| Vacuum Leak Rate | UHV < 1×10⁻¹⁰ mbar·l/s |
| Flange | CF / KF |
| Conductor Material | Kovar (FeNiCo) |
| Temperature Range | -150 °C to 450 °C |
Why It Meets UHV Requirements
- Controlled 50 Ω impedance for RF and fast-signal transmission up to 1 GHz
- Single-face grounding shield or double-face floating shield options
- Kovar conductor with ceramic-to-metal hermetic seal
- Leak tested to < 1×10⁻¹⁰ mbar·l/s, bakeable to 450 °C
- Also available in BNC, MHV, N, SHV and SMB coaxial series
Typical Applications
- RF and microwave vacuum systems
- Plasma diagnostics and probes
- Electron guns and ion sources
- High-frequency instrumentation and test chambers
Custom & OEM Options
Every Alpha Technology feedthrough is manufactured to order. Voltage, current, pin layout, conductor material, flange and mounting geometry can all be customized. Contact us with your drawing or specification and our engineers will provide a free design review.
FAQ
What is the maximum frequency?
The SMA feedthrough transmits up to 1 GHz at 50 Ω. For higher frequencies or higher voltages, our N-Type (1 GHz) and SHV (up to 20 kV) series are available.
What is the difference between grounding and floating shield versions?
A grounding shield ties the outer conductor to the flange potential; a floating shield isolates it, which is useful where the chamber itself is at a different potential.
What is the price?
SMA feedthrough pricing depends on flange type, shield configuration and quantity. Please request a quotation for a custom price.
Related Products
See our full range of vacuum feedthroughs, explore edge welded bellows for motion transmission into vacuum, or read the bellows design & selection guide.
Ready to specify your feedthrough? Request a quote — our engineers respond within one business day.
