Connector Industry Roundup — September 30, 2026:
Board-to-Board RF at D-Sub Density, a Denser I/O Layer & Hermetic Sealing as the Constant

September 30, 2026 produced no single headline connector. What it produced instead were four quiet signals that say where connector demand is heading: denser at the board edge, both in RF and in I/O; lighter and smaller in the power path; and stubbornly demanding wherever a system has to hold pressure for its whole service life. Read together, they describe an industry being pulled in one direction — pack more performance into less space — while never being allowed to relax the sealing requirement that makes that hardware survive.

RF Packs Into a D-Sub: SV Microwave's SMPM Mini-D

SV Microwave introduced the SMPM Mini-D RF Interconnects for board-to-board RF applications, using a space-saving D-sub form factor to deliver RF performance in a package traditionally reserved for signal connectors (Electronics Weekly, 2 October 2026).

The interface is SMPM, giving a high-density solution for RF applications up to 40 GHz. The family is built as a complete interconnect system rather than a single part: an eight-port ganged RF cable assembly, plus two PCB connector mating halves available in both surface-mount and edge-launch configurations, so a designer can pick the board transition the layout actually needs.

Four things matter here for a buyer. The D-sub outline is a familiar, tooling-friendly shape: putting RF into it lets a designer re-use existing panel cut-outs and mounting patterns instead of inventing a bespoke interface. Offering both a surface-mount and an edge-launch PCB half acknowledges that the hard part of board-to-board RF is the launch, not the connector body. Push-on coupling with an error-free mating design is aimed squarely at high channel counts, where a single mis-seated port ruins a multi-channel test or a dense array. And the target list — mil/aero, test-and-measurement and high-density RF modules — is exactly the set of systems where RF channel count is rising but panel area is not.

The I/O Layer Denses Up

The board edge is densifying on the signal side too. ConnectorSupplier's I/O Connectors Product Roundup for the week of September 29 collected the current state of the I/O portfolio across the major suppliers (ConnectorSupplier, 29 September 2026). The through-line is the same density squeeze seen in RF, expressed in pitches, widths and contact counts.

Two rows deserve a second look. The Nicomatic DBMM variant merges connector and backshell into one part — the same "system, not a bag of parts" argument that keeps recurring in high-reliability interconnect. And the Positronic GM/GMCT pair is the classic fixed-versus-removable contact decision, which is precisely the field-serviceability call an aerospace or defense I/O schedule forces you to make early.

Power in Less Space: Han 4 HPR and the Higher-Voltage Turn

The power path is being asked to shrink for the same reason. HARTING introduced the Han 4 HPR, an intermediate connector size that carries up to 70 A while cutting the footprint on the mounting wall by up to 55% versus a Han 6 HPR solution (HARTING Technology Group).

The weight figure is the one to carry into a sourcing discussion. Halving the mass of a high-current connection while keeping IP68/IP69 sealing and railway fire-safety certification is the difference between a viable and a marginal design on an electrified, weight-sensitive platform. The plastic mounting frame that enables it is also a reminder that the housing — not the contact — is often where the last gram and millimetre live.

The same week, the power-distribution conversation on the wire-and-cable side was about the alternative lever: raising system voltage so the amperage, wire gauge and copper mass all fall at once. In a ConnectorSupplier feature on taking complexity out of power distribution, Chief Enterprises described overlaying a 48 V or 60 V system on a legacy 12 V architecture to shrink conductor size, and a bused version of its BRIC ("Breathable Robust Interconnect Center") power-distribution module that integrates the copper busing into the block itself, with a main busbar rated to 150 A (ConnectorSupplier, 29 September 2026). Whether the platform is a work truck or a cabinet of AI power shelves, the design move is identical — move the copper into the module and let the connectors carry fewer, larger currents instead of many small ones.

Hermetic Sealing: The Requirement That Never Relaxes

Against all that densification sits the one requirement that does not trade away: hermeticity. A September 30 technical note from connector manufacturer BoldX Industries walked through why a glass-to-metal seal behaves differently from an elastomer seal over the life of a system (BoldX Industries, 30 September 2026).

The core distinction is that a hermetic connector does not merely resist moisture — it seals against gas. Contacts are fused into a glass insert that bonds to the metal shell, and the barrier is rated by helium leak rate rather than by an ingress-protection number. The argument for glass over rubber is age: glass is inorganic, contains no plasticiser, does not absorb water, and does not take a compression set, harden with heat or crack from ozone the way elastomers do. In a compression seal, the shell shrinks onto the glass as it cools, holding the glass in permanent compression, which is the load case where glass is strongest.

Two implications stand out for a defense or aerospace buyer. The first is dormant storage: munitions and spares can sit in depots for years, and glass has no equivalent of the slow aging that keeps working on an elastomer seal on the shelf, so a sealed part is expected to perform on first power-up. The second is documentation — the same note recommends requesting three things when qualifying a supplier: a per-unit leak-test record, a qualification test report for the part family, and the QPL listing for the exact part number. In a sealed system that cannot be serviced on a maintenance interval, those three documents are the only proof that the seal will still be there at end of life.

What It Means for Connector Buyers

• Re-use the footprint you already have. RF in a D-sub outline and 70 A in a smaller housing both exist so that a denser design can drop into an existing panel. Before commissioning a bespoke interface, check whether a standard outline now carries the performance you need.
• Choose fixed vs removable contacts deliberately. The Positronic GM/GMCT split is not a catalogue detail — it is a field-serviceability decision. Make it early, because it drives tooling, spares and depot process.
• Buy the system, not the connector. A connector-plus-backshell single part (Nicomatic DBMM) and a pre-bused power module (BRIC) both reduce the integration work that a bag-of-parts BOM pushes onto you.
• Trade weight and space on purpose. If a platform is weight- or space-sensitive, a lighter high-current connector that keeps IP68/IP69 and fire certification is worth qualifying against the incumbent, even if the unit cost is higher.
• Do not relax hermeticity to save grams. Where an enclosure holds pressure or gas, specify the leak rate on the drawing, confirm QPL listing, and require per-unit leak test records — glass does not age, but an installation procedure can still ruin it.

The common thread across September 30 is that density and survivability are being pursued together, not traded off. The connectors getting smaller are the same connectors being asked to hold pressure, resist fire and survive a depot shelf — and the suppliers that win the next design cycle will be the ones that can prove both at once.