INTERCONNECTION


The humble connector: Small part, enormous headache


by Inelco Hunter A


sk any electrical engineer to name the single component most likely to ruin their week, and there’s a good chance they won’t say the FPGA, the power supply, or the firmware. They’ll say the connector. It’s rarely the star of the design review, but it’s almost always the thing that provokes an irritable email at 4pm on Friday.


That’s the quiet irony of interconnect engineering: the part with the least glamour carries the most risk.


Misalignment: the tyranny of tiny tolerances


In high-density, multi-pin connectors, a fraction of a millimetre is the difference between a solid mate and an intermittent fault that only appears on the customer’s factory floor (never in the lab). Dimensional inaccuracies in pin geometry or inconsistent housing tolerances can leave contacts fighting for position, and the result is the electrical equivalent of a bad handshake - increased resistance, flickering signals, or a connection that simply gives up under vibration. Engineers dealing with high- density connectors know that misalignment rarely announces itself with a bang; it prefers a slow, deniable fade.


Crimping and wiring: deceptively simple, brutally unforgiving


Crimping looks like the easy part. Squeeze a terminal onto a wire, done. In reality, it’s one of the most failure-prone steps in the entire assembly chain. Under-crimp it, and the wire pulls loose under the first bit of tension. Over- crimp it, and you’ve quietly severed strands inside a housing that now looks perfectly fine from the outside - a defect that won’t show up until the moment it’s least convenient. Add wrong die sets, poor wire prep, or a badly calibrated tool (we’ve all met those), and you get a connection that passes every visual check and fails every real one. There’s a certain dark comedy in it: the crimp that “looks fine” is often the one engineers should trust least.


Corrosion, contamination and the environment’s grudge


Connectors that live outdoors, in vehicles, or


in industrial cabinets are fighting a slow war against moisture and contaminants, and the environment tends to win eventually. Corrosion creeps in as discolouration or a white powdery residue, sneakily raising resistance until a connection that worked for years suddenly doesn’t. Protective coatings help, but nothing is forever - which is a polite way of saying the connector you specified five years ago is not the connector currently failing in the field.


Assembly and interconnect: where good designs go to die


A perfectly specified connector can still be undone by handling - forced mating, repeated un-mating without proper alignment, or a technician who didn’t get the memo about seating force. And even when the assembly is flawless, there’s a more bureaucratic villain waiting: obsolescence. Connectors go end-of-life without warning, tooling gets lost, and suppliers quietly reprioritise, leaving engineers holding a bill of materials with a hole in it and a redesign nobody budgeted for. It’s the sort of problem


30 OCTOBER 2026 | ELECTRONICS FOR ENGINEERS


that has nothing to do with electrons and everything to do with paperwork - which somehow makes it worse. Sounds familiar?


Specialist help is required Behind most connector failures is a very human story: a spec sheet skimmed too quickly, a “temporary” harness that became permanent, a supplier substitution nobody flagged. Inelco Hunter offers a free diagnostic service for engineers wrestling with exactly these interface, pin-out, and sealing issues, will tell you the same thing - most connector problems aren’t really about connectors. They’re about the assumptions engineers make when they stop looking closely at the smallest part on the drawing.


Which is, perhaps, the real lesson. In electronics, as in life, it’s rarely the big, obvious things that trip you up. It’s the two- quid component with forty pins, quietly deciding whether your product works. Inelco Hunter can provide specialist help and a very wide range of connector solutions.


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