Issue link: https://iconnect007.uberflip.com/i/1544707
48 SMT007 MAGAZINE I MAY 2026 place additional mechanical strain on PCBs. Exter- nally mounted electronics, including radar, lidar, and telematics modules, are routinely exposed to road spray, salt, oils, and abrasive particulates. These stresses are compounded by extreme temperature cycling, ranging from sub-zero cold starts in winter to elevated temperatures under direct sunlight or within engine compartments. Moisture represents a significant threat. Even limited condensation within an enclosure can accelerate corrosion, promote dendritic growth, and compromise high-density circuitry. Mechani- cal housings alone are rarely sufficient to prevent ingress under repeated humidity and pressure cycles. Potting and conformal coating fill voids, encapsulate sensitive components, and form a continuous barrier against liquid- and vapor-phase moisture. In addition to environmental sealing, these materials mechanically stabilize assemblies, damping vibration and accommodating stresses caused by thermal expansion mismatch between components and substrates. For telematics, ADAS, and sensor-rich trucking electronics, protection strategies must be selec- tively applied. While components and intercon- nects benefit from potting or conformal coating, antenna structures and RF transmission paths must remain free of these materials to avoid detuning, signal attenuation, or interference. Effective de- signs intentionally isolate antennas from encap- sulated regions. This allows electronic assemblies to be fully protected while preserving wireless performance across Bluetooth, cellular, Wi-Fi, and various frequency bands. This selective approach of potting the electronics while leaving antennas uncoated is essential to achieving both long-term reliability and uninterrupted communication in modern trucking systems. Protecting the Most Vulnerable Interface in Harsh Environments Connector interfaces are among the most vulner- able points in electronic systems operating in harsh environments, particularly in commercial trucking and mobile telematics applications. While enclosures and circuit board potting protect inter- nal electronics, connectors remain exposed to vibration, moisture, dust, road salts, fuels, and oils introduced through cable entry points and mating interfaces. Repeated mechanical loading from harness movement can lead to fretting corrosion, intermittent electrical contact, and fatigue failures at crimped or soldered terminations. Without additional protection, connector interface fail- ures often become the primary cause of system downtime, even when the electronics themselves remain fully functional. Connector potting provides a critical secondary barrier by sealing wire entry points, backshells, and termination zones against environmental ingress while also stabilizing conductors under vibration. Properly selected potting materials en- capsulate individual wires and connector termina- tions, preventing capillary moisture wicking along cable jackets and blocking contaminants from reaching conductive surfaces. At the same time, potting compounds act as strain relief, distributing mechanical loads away from crimped contacts and solder joints. This combination of environmental sealing and mechanical reinforcement significantly improves connector reliability in applications sub- ject to constant motion, shock, and thermal cycling. In systems that rely on wireless communication and high-speed data, connector potting must also be carefully engineered to preserve electrical and signal integrity. Selective application techniques allow power and data connectors to be sealed without interfering with antenna feeds or RF Figure 2: ADAS camera and radar modules are mounted externally on tractors.