Determining Permissive Change Classification for Encapsulated Radio Modules
Modifications to encapsulated radio modules require Class II permissive change filings whenever conducted power increases or radiated emissions degrade.
Encapsulated Module
Meaning
Hardy electronic packages use protective housings to shield sensitive circuitry from environmental hazards. An encapsulated module consists of a printed circuit board assembly that is entirely enclosed in a protective resin or metal shell. This design isolates the components from moisture, dust, and corrosive chemicals in industrial settings.
It is the preferred choice for outdoor sensor nodes and automotive controllers.
Thermal Management
Enclosing a circuit board can trap heat and raise the internal temperature of the components. To prevent this, the encapsulated module uses thermally conductive potting compounds to transfer heat from the silicon chips to the external surface of the enclosure. This pathway keeps the junction temperature of the processor within safe operational limits, preventing thermal shutdown during continuous operation at high ambient temperatures.
It also eliminates hot spots that could damage adjacent components.
Mechanical Protection
Vibration and mechanical shock can fracture solder joints and dislodge large components. The resin fill inside the encapsulated module acts as a structural anchor, holding every component firmly in place. This reinforcement allows the product to survive the high-g impacts common in transportation and heavy machinery applications.
Integration Interface
Connecting the enclosed board to the rest of the system requires stable electrical pathways. Standard connector pins or castellation pads emerge from the potting resin to form the interface. These pins allow the unit to be mounted onto a larger motherboard like a standard surface-mount component during final assembly.