Solve the Mil/Aero COTS Challenge with SET-Tested Interconnects

I’ve been tracking advances in unmanned aerial systems (UASs), miniaturized satellites, and other mil/aero domains, and it’s clear that innovation is accelerating. This innovation is making the choice of interconnect increasingly critical. Traditional mil-spec parts may lack sufficient signal density, and they are often burdened by long lead times, which don’t fit today’s development cycles.

To bridge this gap, I’m seeing designers turn to commercial off-the-shelf (COTS) and modified-COTS components. The trick is finding commercial interconnects that can withstand extreme environments.

Fortunately, vendors like Samtec have tackled this mission head-on. The company’s military and aerospace solutions take its commercial interconnects, known for their “Sudden Service” rapid availability, and puts them through highly demanding Severe Environment Testing (SET). The result is a product lineup that combines commercial-grade availability with military-grade reliability.

What is Samtec’s SET?

The SET initiative tests products far beyond commercial standards. It starts with the company’s Extended Life Product (ELP) certifications, which verify components for 2,500 mating cycles and 10 years of exposure to mixed-flowing gases, simulating field and storage conditions. SET expands on this with testing to applicable MIL-STD-810G and VITA 47 standards, including:

• VITA 47.1 mechanical and environmental: Includes module insertions, operating shock (Class OS2), vibration (Class VS3), and electrostatic discharge (ESD) resistance
• VITA 47.3 humidity and thermal: Tested to survive 100% relative humidity and temperatures that exceed VITA 47.1 Class C4 standards for both operating and non-operating cycles
• High altitude: Measures dielectric withstanding voltage (DWV) at 70,000 feet (ft.)

SET testing supports requirements for NASA Class D missions, and some are tested against NASA’s ASTM E595-77/84/90 outgassing requirements. The results of all SET tests are publicly available, making it easy for designers to determine if an interconnect is suitable for their application.

Samtec SET program adds URSA I/O ultra-rugged cable assembly system

SET-qualified interconnects span a wide range of solutions, from fine-pitch board-to-board connectors to high-performance power connectors. One of the most recent additions to the lineup is the URSA I/O ultra-rugged cable assembly system, comprising B1SDT cable assemblies and P1M board-mounted connectors. These connectors are built around a hyperboloid-type contact that provides multiple points of contact per pin for extreme reliability and a high number of mating cycles. Options like electromagnetic interference (EMI) shielding, captive panel screws, and strain relief round out the rugged design.

With a 1.00 millimeter (mm) pitch in a double-row configuration, the B1SDT cable assemblies support 80 positions per interconnect, reaching a signal density of 1,160 total I/Os in a single 1 RU panel. A typical cable is the 10.00 inch (in.) B1SDT-10-28-H-10.0-1 (Figure 1), which provides 20 positions with 28 AWG wire.

Figure 1: The 10 in. URSA B1SDT-10-28-H-10.0-1 cable assembly provides 20 positions with 28 AWG wire. (Image source: Samtec)

The corresponding P1M connectors are available in through-hole or surface-mount configurations, with vertical or right-angle orientations. One example is the P1M-10-01-S-D-RA-TR (Figure 2), a 20-position, right-angle, surface-mount connector. Like all members of the P1M family, this connector is also available with hot-swap capability.

Figure 2: The URSA P1M-10-01-S-D-RA-TR is a 20-position connector in a right-angle, surface-mount configuration. (Image source: Samtec)

Taken together, the features of the URSA I/O system make it a natural fit for applications such as ground control stations, radar processing units, and shipboard electronics, where high connector density, frequent maintenance cycles, and harsh vibration profiles converge.

1.27 mm Tiger Eye cable-to-board system joins SET program

Samtec also recently added the 1.27 mm Tiger Eye cable-to-board system to its SET lineup. Tiger Eye features a multi-finger, heat-treated beryllium copper (BeCu) contact design. BeCu’s spring properties ensure the contact retains its shape through thousands of mating cycles. The mating surface is on the flat, smooth side of each finger, minimizing plating wear and extending contact resistance performance and overall plating life.

The system includes SFSDT cable assemblies and TFM connector headers, with a polarized double-row design supporting 100 pins. Metal latch and screw-down options, plus Teflon-coated cables, make these assemblies well-suited for avionics backplane wiring, weapons systems, and other applications where hand-routed cables must deliver reliable performance under vibration and thermal stress.

For example, the SFSDT-25-28-G-08.00-DR-NDX (Figure 3) is a 50-position, double-ended, 8 in. cable assembly with 28 AWG wire. It mates with the TFM-125-02-S-D-WT (Figure 4), a 50-position through-hole connector header with weld tabs for secure board attachment.

Figure 3: The Tiger Eye SFSDT-25-28-G-08.00-DR-NDX is a 50-position, double-ended, 8 in. cable assembly with 28 AWG wire. (Image source: Samtec)

Figure 4: The Tiger Eye TFM-125-02-S-D-WT is a 50-position through-hole connector header with weld tabs for secure attachment to the board. (Image source: Samtec)

Conclusion

For me, the takeaway is simple: if a program needs both fast turn times and extreme reliability, SET-qualified parts are a great place to start. Designers get all the benefits of commercial-scale production without worries that the specs might derail qualification later. The URSA I/O and Tiger Eye systems demonstrate the point: they deliver no-compromise performance, ready availability, and the proven ability to handle even the toughest environments.