HD-EFI Connectors
Micro miniature 50 Ω board‑to‑board RF connectors with high float and blind‑mate capability
Overview
Amphenol RF’s HD‑EFI connectors are precision-engineered for compact, multi-layer PCB interconnections requiring alignment tolerance and high-frequency performance. Designed with generous axial and radial “float,” they support blind mating and accommodate board-to-board spacing variations—ideal for modular wireless systems and densely packed electronics.
With reliable RF performance up to 6 GHz and compact push-on contact geometry, HD‑EFI ensures stable signal integrity across multiple mating cycles. Available in common PCB jack and cable plug formats, plus bullet adapters for flexible board stack-ups, this series is perfect for broadband routers, military/aerospace gear, and telecom infrastructure.
Features and Benefits
- High float tolerance: ±0.7 mm axial and ±0.3 mm radial misalignment support error-prone assembly conditions.
- Blind-mate capability with crash-proof, closed-entry design protects contacts during mating.
- Compact and modular: micro-miniature interface supports multiple RF lines on small PCB real estate.
- 50 Ω performance to 6 GHz ensures broadband communication quality.
- Variety of formats: PCB jacks, cable plugs, and bullet adapters for stack flexibility.
Key Technical Details
- Impedance: 50 Ω nominal (broadband systems)
- Frequency Range: DC–6 GHz, with consistent performance across blind-mate range
- Voltage Rating: 335 VRMS continuous, up to 1 000 VRMS dielectric withstand
- Coupling Mechanism: push-on blind-mate, crash-resistant contacts
- Mechanical Float: ±0.7 mm axial / ±0.3 mm radial to handle PCB variances
Applications
- Modular telecom and broadband routers
- Military and aerospace communication modules
- Multi-network PCB stacks in instrumentation and medical systems
- Vehicle and defense wireless board-to-board assemblies
- Compact RF systems with strict alignment tolerances
Browse our HD‑EFI series including surface-mount PCB jacks, right-angle cable plugs, and an assortment of bullet adapters for precise stack-up configurations. For custom board spacing tolerances, cable-to-board transitions, or tailored integrated solutions, contact our engineering team to design a fit-for-purpose interface.
Specifications
HD-EFI Connectors
Electrical
| Impedance | 50 Ohm |
| Frequency Range | DC - 6 GHz |
| Voltage Rating | 335 Volts RMS Continuous |
| Dielectric Withstanding Voltage | 1000 Volts RMS Max |
| VSWR (Return Loss) |
|
|
Axial Misalignment ± 0.7 mm
|
|
|
DC - 2 GHz
|
1.14 (-24 dB) Max |
|
2 - 4 GHz
|
1.22 (-20 dB) Max |
|
4 - 6 GHz
|
1.38 (-16 dB) Max |
|
Axial Misalignment ± 0.3 mm
|
|
|
DC - 2 GHz
|
1.08 (-28 dB) Max |
|
2 - 4 GHz
|
1.12 (-25 dB) Max |
|
4 - 6 GHz
|
1.2 (-21 dB) Max |
| Insulation Resistance | 5000 MΩ Min |
| Center Contact Resistance | 5 mΩ Max |
| Outer Contact Resistance | 5 mΩ Max |
| Insertion Loss |
|
|
DC - 3 GHz
|
-0.14 dB Max |
|
3 - 6 GHz
|
-0.27 dB Max |
| 3rd Order Intermodulation | 930 & 955 MHz (2X43 dBm), -163dBc Max (Low PIM Designs) |
| Power Handling | 40 W Max @ 2.6 GHz @ 95ºC |
|
|
120 W Max @ 2.5 GHz @ 95ºC |
Environmental
| Temperature Range | −45°C to +125°C |
| Thermal Shock | MIL-STD-202, Method 107, Condition B |
| Corrosion | MIL-STD-202, Method 101, Condition B - 5% Salt Spray |
| Vibration | MIL-STD-202, Method 204, Condition B |
| Mechanical Shock | MIL-STD-202, Method 213, Condition A - No Discontinuity Permitted |
| Humidity/Temperature Cycling | MIL-STD-202, Method 106, Condition A |
| Temperature Life | 250 Hours at 125° C, No Damage to Parts |
Mechanical
| Mating Cycles | 50 Min (Limited Detent), 200 Min (Smooth Bore) |
| Coupling Mechanism | Push-On |
| Interface Specification | Amphenol RF Proprietary |
| Engagement Force | 12 N Max (Smooth Bore), 25 N Max (Limited Detent) |
| Disengagement Force | 2 - 6 N (Smooth Bore), 9 N Min (Limited Detent) |
| Mechanical Misalignment |
|
|
Axial
|
±0.7 mm |
|
Radial
|
±0.7 mm |
|
Max Float Angle
|
5⁰ Surface Mount Parts, 3.5⁰ Through-hole Mount Parts |
|
Min Board to Board Distance
|
11.46 mm |
Note: These characteristics are typical and may not apply to all connectors.
Connector configurations may affect performance.
Related Resources
HD-EFI product series expands with thread-in configurations
Amphenol RF is proud to announce the expansion of our HD-EFI product line, designed to satisfy the need for a compact RF interconnect solution.
HD-EFI Connector Series
The HD-EFI product series by Amphenol RF offers micro-miniature interfaces designed for high-performance applications with a frequency range from DC to 6 GHz. These 50 ohm products are ideal for board-to-board applications, featuring versatile PCB mounts and bullet lengths, and providing up to 1.4 mm axial and radial float. HD-EFI connectors are available in various configurations, including through-hole, surface mount, edge launch, and thread-in, and support blind mating with crash-proof designs.
Board-to-Board Solutions
Amphenol RF's board-to-board solutions provide high-performance interconnect options designed for seamless integration in various applications. These solutions ensure reliable connectivity between PCBs, optimizing space and maintaining signal integrity across different frequencies and environments. The product line includes a variety of connector configurations to meet specific design requirements, supporting a wide range of industries from telecommunications to industrial automation.
Amphenol RF HD-EFI Product Series Solutions Guide
The Amphenol RF HD-EFI Product Series Solutions Guide provides an overview of the high-density, board-to-board HD-EFI connector series. It details the compact design, high-frequency performance, and robust mechanical features that make these connectors ideal for automotive, industrial, and wireless applications.
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