Samtec Ships 26.5 GHz Edge-Mount SMA Connector for High-Density RF Applications

Samtec has released a new edge-mount board connector rated to 26.5 GHz with a 50 Ω characteristic impedance. The design targets PCB edge-launch applications in 5G/6G wireless infrastructure, test and measurement, and military and aerospace systems.

The Problem

Board-level RF connectivity has always created tradeoffs. Vertical or right-angle connectors introduce discontinuities at the launch point, which degrades return loss performance and complicates high-speed signal integrity. On high-density boards, these connector footprints also consume valuable real estate. Designers working at millimeter-wave frequencies need a termination that sits flush with the board edge without sacrificing mechanical reliability.

The Solution

The new SMA edge-mount connector from Samtec terminates directly to the PCB edge, creating a compact launch that reduces discontinuities compared with vertical or right-angle alternatives. The design uses a 4-post through-hole configuration for mechanical retention, which matters in applications where vibration or thermal cycling can loosen connections over time.

Plating specifications are specific: gold-plated body and contacts with 30 µin of gold on the center contact and 10 µin on the outer contact. The connector supports up to 500 mating cycles, which puts it in the mid-range for SMA-grade durability. The 4-post through-hole approach provides improved retention over single-pin designs, though engineers should verify pinhole tolerances match their board stack-up.

"For us, the edge-mount approach eliminated the launch discontinuity we'd been fighting on our 24 GHz boards. Return loss went from -12 dB to better than -18 dB at the connector interface," said one RF design engineer working on phased array systems.

Cable Compatibility and Flexibility

One practical advantage is the connector's compatibility with multiple coaxial cable options. Designers can terminate to low-loss flexible microwave cable ranging from .047 in. to .277 in. diameter, semi-flexible cable, or Samtec's own Nitrowave high-performance cable. This flexibility matters during prototype iterations where cable routing or flexibility requirements might change mid-development.

What Engineers Need to Know

The 26.5 GHz rating covers the upper Ku-band and lower K-band frequencies used in 5G backhaul and satellite communications. At this frequency range, the edge-mount geometry provides meaningful advantages over traditional launch configurations.

The connector ships with standard SMA interface dimensions, which means it mates with common SMA cable assemblies already in most test labs. The through-hole design requires adequate board thickness for reliable solder fillet formation.

For production teams, the 500-cycle rating suggests this connector suits applications where field service or maintenance requires repeated mating cycles. The gold plating thickness falls within standard SMA specifications, so compatibility with existing test equipment and mating connectors should not be an issue.

Pricing and stock status are available through Samtec's distribution network. The connector is production-ready, not a preview or sample-stage product.

Technical Specifications

- Frequency range: DC to 26.5 GHz - Characteristic impedance: 50 Ω - Center contact plating: 30 µin gold - Outer contact/body plating: 10 µin gold - Mating cycles: 500 - Termination style: Edge-mount, 4-post through-hole

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M4S TAKE

My take: AI claims need scrutiny. The useful implementations reduce cycle time or defect rates in measurable ways. Vague promises about 'optimization' without specific metrics are usually marketing.

Simon McLoughlin