PCB Fabrication Assembly Can Withstand Harsh Environments
If you’re going to design and build a PCB that’s intended for harsh environments, it’s important to take the appropriate measures during manufacturing to ensure that it will be able to withstand these conditions. This includes selecting the right materials and components, incorporating heat dissipation techniques into the layout, and using conformal coating or encapsulation to prevent dust and moisture from entering the PCB.
The first step is identifying and choosing the right PCB manufacturer. A contract manufacturer with the right experience handling military and aerospace projects will have specific certifications to show that they can handle the sensitive materials and strict requirements of these types of jobs. It’s also important to find a CM that has the correct tools to handle your project, such as a pick-and-place machine that can accurately place complex components with minimal human intervention.
After the board is designed, it’s ready for the next phase of production: fabrication. During this process, the PCB is assembled with components and soldered to form the connections between layers. The final step of this stage is testing and inspection, which will look for any unintentional shorts between nets on the circuit board.
For the assembly, the assembler uses a pick-and-place machine to place electronic components on a bare PCB. These machines can accurately position parts and apply a fine solder paste to the joint. This ensures that the connection will be strong and that the part won’t move out of position during testing or operation. Once the placement is complete, the assembler may use an aggressive flux to help hold the joints in place until they’re soldered.
How PCB Fabrication Assembly Can Withstand Harsh Environments
Once the board is finished with all of its components, it undergoes continuity testing using a bed of nails or flying probe test system. These tests look for any unintentional shorts or other defects in the circuit board.
In addition to these tests, the assembler performs an optical inspection of each individual component and the entire board. This is done to make sure that the assembler has followed the schematic and placed the components in the correct locations. If the assembler hasn’t, the circuit board won’t function as it should.
During the pcb fabrication assembly process, a special surface finish or coating is applied to the circuit boards for military and aerospace applications. This is because these types of environments can include extreme heat, humidity, and vibration. The coatings, such as acrylic based sprays or immersion silver, protect the circuit boards from these harsh environments. They also insulate the components, reduce heat, and limit vibration that can crack solder.
Lastly, thermal compounds are used to increase the clearance between high heat-generating components and the surrounding copper on the PCB to allow for more space for heat to be dissipated. Ensure that your PCB designer is familiar with these types of processes when designing your boards for harsh environments. This will make your products more reliable and long-lasting. It will also reduce the risk of failure due to environmental stressors like heat and humidity.