Which type of PCB is suitable for harsh environments?
27 December 2024
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High temperature, humidity, corrosion, and vibration can affect the normal performance of PCBs, such as in the field of industrial aviation. To cope with such environments, specific PCBs are designed with different characteristics in mind.
What materials to choose?
1. High temperature laminate: PCBs exposed to high temperatures require materials that are resistant to high temperatures and stable. High Tg FR-4 and polyimide can meet this feature well.
2. Ceramic substrate: Ceramic materials have higher thermal conductivity and stability and are commonly used in the aerospace, military, and automotive industries.
3. MCPCB: MCPCB contains a metal layer to achieve effective heat dissipation and is ideal for LED lighting.
What protective coating to choose?
1. Conformal coating: A thin protective layer sprayed on the PCB to prevent moisture, dust, and chemical corrosion.
2. Potting: Encapsulating the PCB in a housing to enhance its ability to resist vibration and environmental contamination.
3. Anti-oxidation: Surface treatment with gold plating can better prevent corrosion.
Which PCB designs can better protect the PCB?
1. Thick copper layer: For high current applications, thicker copper layers can enhance conductivity and reduce overheating.
2. Through-hole protection: Blind and buried vias can reduce exposure to external components and reduce contamination.
3. Thermal management: The proper placement of heat sinks, thermal vias, and metal cores can prevent PCB overheating.
What standards can guarantee PCB quality?
1. IP rating: determines the dust and water resistance of the PCB.
2. Comply with IPC-6012 (for rigid PCBs) or MIL-STD-810 (for military applications), and the products that pass can ensure that they can operate in harsh environments.
Conclusion
PCBs can work better in harsh environments only when the materials, protective coatings, designs, and compliance standards are met.