Samtec 1.85 mm Launch + SGeT oHFM.c: Q3 2026 Buyers

Samtec 1.85 mm 30° Launch Connectors and the SGeT oHFM.c Edge-AI Module Standard: What Hyperscaler, ATE, and RF Test Buyers Need in Q3 2026

Two announcements, one buyer problem

An ATE fixture builder in Taipei opens a Samtec product alert email on the morning of 1 September 2026 and finds two items that look unrelated. The first is a 1.85 mm 30° angled RF launch — a small, threaded coaxial connector that bolts to a load-board PCB and presents a controlled-impedance path to 67 GHz for oscilloscope head amplifiers and 224 Gbps PAM4 SERDES characterization. The second is a press note that Samtec has joined the SGeT (Standardization Group for Embedded Technologies) effort around oHFM.c — an open Hardware Functional Module for Compute that defines a small-form-factor carrier + mezzanine layout for edge-AI compute modules. Different markets. Same vendor. Same day. The reason they belong in the same RFQ is that both products are stress-testing the same assumption: that the OEM-franchise channel will hand you a clean, on-datasheet answer the next morning. For independent buyers the answer is harder.

What follows is what the 1.85 mm launch and the oHFM.c module work actually change in Q3 2026, what they do not change, and how an independent connector and interconnect distributor with no franchise line card approaches both.

The 1.85 mm 30° angled launch: who needs it and why now

The 1.85 mm interface (also called V-band to 67 GHz) has been the workhorse mm-wave coaxial connector for instrumentation-grade test since the late 1990s. It mates with 2.4 mm connectors mechanically and is the upper-frequency complement to the 2.92 mm K connector and the older 3.5 mm SMA-style line. Where the 30° angled entry on a PCB used to force a buyer to either bend a semi-rigid coax at the bench (a maintenance and repeatability disaster) or accept a longer trace through a vertical launch, the angled connector lets the fixture sit inside the same footprint as a vertical-launch board with a swept trace, while keeping the torque-controlled coupling that 1.85 mm needs at every mate.

The launch matters in Q3 2026 for three reasons.

First, 224 Gbps PAM4 SERDES characterization — already shipping on the NVIDIA Blackwell-class accelerators and the AMD MI300X follow-ons — pushes fixture designers above 50 GHz of useful bandwidth. Tektronix, Keysight, and Anritsu have each released 67 GHz-class oscilloscope heads and modular BERTs through 2025 and 2026, and the ATE load-board community in Taiwan, Israel, and California has been waiting for an angled launch so it does not have to choose between a swept trace (long, lossy) and a vertical launch (footprint-heavy). A 30° angled option collapses the trade-off.

Second, AI hyperscaler test capacity has shifted from a few large tester vendors to a broader long tail of merchant ATE builders and ODMs in Penang, Suzhou, and Hsinchu. Those buyers often need short runs of 67 GHz load boards for product bring-up but cannot justify the franchised MOQ on the most recent Samtec or TE 1.85 mm catalogue part. That is the gap the independent channel can fill.

Third, 1.85 mm adapters — the threaded, torque-controlled parts that let a 1.35 mm tester cable reach a 1.85 mm fixture — are already scarce through Q2 2026 lead-time reports. The TE Connectivity 2385341-1 (1.35 mm jack to 1.85 mm plug, 50 Ohm, 67 GHz, 500 mating cycles, stainless steel body, gold-plated beryllium copper centre contact) and the TE Connectivity 2385340-1 (1.35 mm plug to 1.85 mm plug, same 67 GHz ceiling, same 500-cycle rating) are two of the products the catalog covers precisely for this buyer. They show the catalog still has depth on the adapter side even when the new angled launch itself is still ramping.

The oHFM.c standardization push: what is actually being standardized

SGeT is a German-origin embedded-compute standards body that has spent the last decade pushing COM Express, SMARC, and the Open Compute Module families. The oHFM.c effort extends that lineage to a smaller, edge-AI focused module class — closer in footprint to a credit card than to a COM Express Type 6 card, with carrier-to-mezzanine high-speed lanes, USB, and side-band GPIO. Samtec's support of oHFM.c, announced at the end of August 2026 via industry trade media, signals that the board-to-board mezzanine connector choice on the module — historically the part that locks a developer into one vendor's roadmap — is being deliberately cross-vendorized. Samtec's SEARAY, AcceleRate mP, Edge Rate, and Flex Stack ZW families are among the parts being benchmarked for the oHFM.c reference carrier.

For buyers the implication is twofold. The first is that any design started on oHFM.c in 2026 will need both a mezzanine stack connector (Samtec ZW, AcceleRate, or a Molex SEARAY-equivalent) and a USB 2.0/3.x link on the carrier-to-host side. The catalog covers the Samtec USB-A and USB-B industrial series directly: the USB-B-S-S-B-SM (4-contact USB 2.0 Type-B, gold-plated, surface-mount right-angle, solder termination), the USB-B-S-S-B-TH (same electrical, through-hole pin retention for wave solder), the USB-A-S-F-W-TH (USB 2.0 Type-A, through-hole), and the higher-pin-count HDMR-19-02-S-SM are all representative. Second, the design will need a backplane-class connector on the host side for compute-edge modules that fan out into a 1U or 2U shelf. The catalog covers that lane too — the Amphenol XCede 958-6201-A1H (header, 0.073 in / 1.85 mm pitch, press-fit, 6 A, UL94 V-0), the Amphenol XCede 951600C20H (6-position backplane header at the same 1.85 mm pitch), and the Amphenol XCede 951200C40H (2-row, 1.85 mm pitch, 6 A per contact) are the kinds of parts that show up in oHFM.c host reference carriers.

Market context: what is being said, and where the evidence stops

The two Samtec announcements are the headline; the rest of the picture is what independent distributors hear from the OEM ATE channel and what is verifiable in the field. Two facts anchor the framing here.

The first is the Samtec 1.85 mm 30° angled launch product itself, confirmed in industry trade coverage on 1 September 2026. The connector targets mm-wave and 224 Gbps characterization fixtures. The trade source is an analyst publication that covers connector launches monthly; the announcement does not specify MOQ or production lead times beyond the standard Samtec 6-to-8-week window for new RF launch SKUs.

The second is the SGeT oHFM.c reference design participation, also reported in industry trade coverage on 31 August 2026 and 1 September 2026. The SGeT working group has not published a finalized pinout or a finalized mezzanine connector at the time of writing, but the working group has signaled that the module target envelope is in the 70 mm × 55 mm range with two high-speed mezzanine connector banks and one USB 2.0/3.0 differential pair. For a buyer, the safest reading is: design the module on a mezzanine connector that has at least one alternate-source cross (Samtec SEARAY ↔ Molex SEARAY; Samtec AcceleRate mP ↔ Samtec Edge Rate ERF8 in some stack heights), and source the USB pair from a vendor with both SMT and through-hole footprint options so the assembly house is not held hostage by reflow availability.

What the evidence does not support, and what should not be repeated in any RFQ cover letter, is the claim that the 1.85 mm angled launch has solved a franchised-MOQ problem. It has not. The angled launch is a normal Samtec catalogue addition. It will show up on Mouser and Digi-Key with the usual Samtec MOQ (1 piece on sample, 100-piece tube on production). It will not solve allocation. What it does change is the fixture designer's BOM choice — and that is the only thing the independent channel needs to know about it.

What the evidence also does not support is the claim that oHFM.c is a de facto standard. It is a working-group reference design with one major connector vendor announcing support. Until a second vendor announces the same pinout and a reference carrier ships with two sourceable mezzanine connectors, treat oHFM.c as a roadmap signal and not a procurement specification. That matters because independent distributors quote against spec, not against roadmap, and a roadmap-driven RFQ returns a roadmap answer.

What the catalog covers for independent buyers

For a 1.85 mm or 2.4 mm test bench buyer in Q3 2026, the catalog already carries the workhorse parts that anchor the test chain.

On the RF adapter and launch side:

TE Connectivity 2385341-1 — between-series RF adapter, 1.35 mm jack to 1.85 mm plug, straight, 50 Ohm, 67 GHz max, stainless steel body, gold-plated beryllium copper centre contact, 500 mating cycles, free-hanging (in-line) mounting, threaded coupling both ends.
TE Connectivity 2385340-1 — between-series adapter, 1.35 mm plug to 1.85 mm plug, 50 Ohm, 67 GHz max, same 500-cycle rating, stainless steel, threaded both ends.
Samtec 240-J-P-EP-ST-CM-2 — 2.4 mm (APC-2.4, OS-50) jack, female socket, 50 Ohm, 50 GHz max, compression centre-contact termination, threaded flange mount, stainless steel, 500 mating cycles, 220 V voltage rating, surface mount.
Amphenol SMP-FS2A-860 — SMP to SMP adapter, straight, plug to plug, female to female centre gender, 50 Ohm, 40 GHz max, beryllium copper body, gold finish, snap-on, 100 mating cycles.

On the 1.85 mm-pitch backplane header side (for oHFM.c host reference carriers and for high-speed backplanes that share the 1.85 mm pitch convention):

Amphenol XCede 958-6201-A1H — header, male pins and blades, 0.073 in (1.85 mm) pitch, 1 column, press-fit through-hole termination, gold contact finish, 6 A current rating, UL94 V-0.
Amphenol XCede 951600C20H — XCede backplane header, 6 positions, 0.073 in (1.85 mm) pitch, 1 row, press-fit, 6 A rating, guide pin feature, through-hole.
Amphenol XCede 951200C40H — XCede header, 6 positions, 1.85 mm pitch, 2 rows, 6 A per contact, press-fit, gold plating, UL94 V-0.

On the modular-compute USB side (for oHFM.c module-to-host USB links):

Samtec USB-B-S-S-B-SM — USB 2.0 Type-B receptacle, 4 contacts, gold-plated, surface-mount right-angle, solder termination, UL94 V-0 housing, -50°C to 85°C operating temperature.
Samtec USB-B-S-S-B-TH — same USB 2.0 Type-B, 4 contacts, gold-plated, through-hole pin retention for wave solder, 1500-cycle durability.
Samtec USB-A-S-F-W-TH — USB 2.0 Type-A, through-hole, gold contacts.
Samtec HDMR-19-02-S-SM — 19-position high-density metric ribbon-style connector, surface-mount, supporting mixed signal and shielded differential pairs at modest pin counts.

On the mezzanine side (for oHFM.c module-to-carrier):

Samtec ZW-22-19-G-D-830-250 — ZW Flex Stack board-stacker, 0.100 in (2.54 mm) pitch, 44 positions, 2 rows, through-hole solder, 0.830 in stack height, 0.250 in mating post length, gold post finish at 10 µin (0.25 µm), black, ROHS3 compliant. This is the long-tail part designers default to when the mezzanine connector decision is still open.

The point of listing the parts is not the specific MPNs — independent channel stock rotates and a different lot of the same part number is what you will get on a quote. The point is the coverage across four lanes: 1.85 mm/2.4 mm RF test, 1.85 mm-pitch backplane, USB industrial, and 2.54 mm mezzanine. A buyer who needs all four lanes on the same BOM can line-item them through one RFQ; the independent channel does not need to invent depth where the franchised line card already has it.

What the independent channel can and cannot do here

The honest answer, written for a procurement manager who is trying to decide whether to add an independent line to the franchise line card for these lanes:

What the channel can do. Quote against datasheet and request exact-reel traceability on RoHS3, date code, and country of origin for the RF and backplane parts. Sub a 67 GHz 1.85 mm adapter in sample quantity when the franchised line is at 12-week lead time and the buyer's ATE fixture needs to ship inside that window. Cross-reference the Samtec USB and ZW lanes to a Molex-equivalent or Hirose-equivalent if the design has second-source requirements that the oHFM.c working group has not yet baked into the reference. Carry MOQ down to single-piece sample orders on the test bench adapters that do not exist at a one-piece MOQ on the franchised line. Confirm lead time per line at the moment of RFQ and again at PO acknowledgment, because both Samtec and Amphenol are running their own production schedules and the franchised portal's posted lead time is not always the same as the order-acknowledgment lead time.

What the channel cannot do. Replace a franchised design-in. If the OEM's reference design on oHFM.c specifies a Samtec AcceleRate mP on a specific stack height with a specific footprint, the independent channel cannot substitute a different stack height without an EE sign-off, and that EE sign-off requires the OEM reference design to be re-validated. Provide a datasheet-equal guarantee. Independent distributors are not authorised; we do not carry the OEM's warranty, and we will not write "drop-in equivalent" on a quote when the OEM has not written it. Source a Samtec 1.85 mm angled launch before Samtec announces production availability. The new launch is on a vendor-side roadmap as of early September 2026, and an independent channel that promises you a production-volume price on it has either lied or quoted against a not-yet-released SKU.

Where the channel is the right tool. MRO and lab builds for the 1.85 mm test bench. Late-stage fixture modifications where a 30° angled launch replaces a vertical launch and the BOM changes by one line. Pilot builds on oHFM.c where the mezzanine connector is still being decided and the carrier BOM needs to be flexible. Long-tail spares for a deployed ATE fleet that has a different connector revision than the current franchised catalogue. Cross-vendor BOM consolidation where the engineering team wants one distributor line on the PO instead of three.

Where the channel is the wrong tool. New production programs where the OEM has committed to a single-vendor BOM and the OEM's franchised distributor already carries the line. Safety-critical designs (medical, aerospace primary structure, automotive drivetrain) where the OEM's process control is part of the safety case. Designs where the OEM's reference carrier has not yet been validated against the alternative mezzanine connector and the buyer cannot afford the validation cost.

How a buyer should structure an RFQ in this lane

Three practical rules, drawn from the way the channel actually works.

First, send the BOM as a structured spreadsheet with column headers for MPN, manufacturer, last-time-buy flag, RoHS status, target quantity, and ship-from preference. An independent distributor cannot quote against a PDF screenshot of a BOM. A spreadsheet lets the channel tell the buyer in one reply which lines it can quote firm, which lines it can quote against a confirmed-up MOQ, and which lines it cannot quote at all. That triage is what makes the RFQ useful to the buyer; the channel can be more accurate about MOQ on the 67 GHz adapter line (often a confirmed-up 5-piece minimum because of test-house demand) than about a USB-A through-hole (where the channel will often go down to one piece).

Second, ask for a written confirmation of RoHS3 compliance and date code. Both Samtec and Amphenol publish RoHS compliance on the official datasheet, but the date code on the reel the channel ships is the date code on the actual product in the channel's possession. For 1.85 mm adapters, the buyer should confirm date code against the test house's fixture validation window — fixtures built against a 2024-dated adapter lot will read slightly differently than fixtures built against a 2026 lot, and the difference shows up as a phase drift at 50 GHz that is invisible to a continuity test but visible to a vector network analyzer.

Third, ask for a written note on the channel's substitution policy. If the channel substitutes a different lot of the same part number, the buyer wants to know. If the channel cross-references to a different MPN, the buyer wants to know. If the channel cannot meet the MOQ and has to drop the line, the buyer wants to know. None of these substitutions changes the part's identity in the eyes of the franchised vendor, but all three change the buyer's risk model. The independent channel that writes this out in advance is the channel worth keeping on the RFQ list.

Where this leaves us in Q3 2026

The 1.85 mm angled launch is a real product on a real vendor roadmap, and it does address a real fixture-design pain point that has been talked about for two years in the ATE community. The oHFM.c reference design is a real standardization push with one major connector vendor on board, but it is not yet a procurement specification. The independent channel can quote against both — the angled launch through Samtec's franchised partners and via the 67 GHz adapter backstop that the catalog already covers, and the oHFM.c reference through the mezzanine, USB, and backplane lanes that oHFM.c will need when it ships its first reference carriers. It cannot replace the franchised design-in, and it should not pretend to.

For a buyer the next 60 to 90 days should be spent on three things: line up the 1.85 mm adapter cross (TE 2385341-1 / 2385340-1 are the canonical short list) so the bench can keep moving while the angled launch ramps; lock down the mezzanine connector decision on the oHFM.c pilot carrier before the working group finalizes the pinout (the catalog has Samtec ZW and the Amphenol XCede 1.85 mm-pitch header as two anchor options); and put the independent channel on the RFQ list for the lanes where the MOQ is a barrier and the design-in is not. Independent connector and interconnect distributors do best when the franchised line is acknowledged and the buyer's gap is the actual ask.

Next concrete step: pull the BOM for the next 1.85 mm or oHFM.c pilot build, mark which lines are franchised-MOQ-locked and which lines are flexible, and send the flexible lines to the independent channel with a structured spreadsheet. The response will tell you within 24 hours whether the channel can carry the load.